Yard and Garden: June 28, 2019

Yard & Garden blog, 2019

This is the Q&A for the Yard and Garden show for June 28, 2019. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through August 2, 2019. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: Dave Olson, Forest Health Specialist from the Nebraska Forest Service

1. The first question of the show was about a red twig dogwood that is overgrown. Can it be pruned now?

A. It would be better to wait until fall to prune it. It can be thinned by removing 1/3 of the canes at ground level. This type of pruning can be done every year to remove the oldest, least productive canes from the plant. You can also do a rejuvenation pruning on it by cutting the whole plant off 6-8 inches above ground level in the fall. This will help to bring back a deep red color in the stems that may have faded over the years. If you rejuvenate it this fall, it will not bloom next year, but should after that.

2. A caller has a couple of blue spruce trees with low hanging branches. Can those branches be removed now to make it easier to mow around?

A. Yes, you can remove those lower branches for mowing around. That can be done most anytime, but it is best in the late winter while the tree is still dormant.

3. This caller has green ash suckers that are growing up in her gooseberry bush. These have come from an ash tree that was removed a few years ago but is still suckering. What can be done to kill the ash seedlings and not harm the gooseberry bush?

A. It might help to get someone to grind out the ash stump to help fully kill the tree. If the stump is still there, the roots are likely still alive and doing what they can to bring the tree back, which includes suckering in other locations. Otherwise, you can just keep cutting the suckers off and eventually the roots will run out of energy. You could also cut back these suckers and paint the fresh cut with a roundup or glyphosate product.

4. A caller has gray bugs with long black antennae that are found in her garden. What are these and how can they be controlled?

A. These bugs could be blister beetles. They can sometimes come into our gardens. Certain years, they can be found in high population. If they are feeding on your garden plants, you can spray with some sevin or eight to control them.

She also wanted to know what would cause her iris leaves to turn yellow with brown spots in the yellow color?

A. This is likely from Iris Leaf Spot, a common fungal disease of Iris plants. This can be controlled fairly well by removing and destroying the infected plant material as it shows up. When watering, don’t water over the foliage which will spread the disease. If necessary, a fungicide such as Daconil can be used if sanitation isn’t enough.

5. This caller is trying to re-establish a new windbreak. For a quick windbreak solution, would the quick growing willow-type trees work well?

A. Willows and other very fast growing trees would not work as a windbreak, even temporarily. The fast growth in these trees would not be very strong growth and therefore it would break a lot in windy situations. It would be better to go with a larger shrub such as a viburnum or serviceberry to help fill in until the trees can grow up larger. These shrubs would block the winds quicker than some trees but withstand strong winds and storms much better than willows.

2015-07-30 16.59.34
Bindweed

6. What can be done to control bindweed in phlox?

A. Among other plants it is best to use the “glove of death” which is when you wear a chemical-resistant glove and then put a cloth glove over that. Then, dip a few fingers of the gloved hand into Glyphosate and rub those fingers along the stem and leaves of the bindweed to kill it. Basically, the idea is to keep it from flowering and producing more seed, hand pulling will help keep new seed from being deposited into the garden which can be viable for up to 60 years.

7. A caller wants to know if she can use the Extended control Preen on her petunias, they are not listed on the label?

A. If it is not listed on the label, you can’t use that pesticide on that plant. Stick with the general preen that has the petunias on the label to ensure correct application.

8. This caller has a pin oak tree with lower branches that are in the way of mowing. Can those be removed right now?

A. No, it is best to avoid pruning oak trees during the summer months. Oaks are susceptible to a disease called oak wilt that is spread by a beetle. The beetle is attracted to the trees after they have been pruned. Oak wilt can kill the tree if it is introduced to the tree. Wait until the fall or until the trees are dormant or early next spring before April to prune oak trees to avoid this disease.

9. A caller had her driveway lined with small mums that grew only to 1 foot tall. Over time some of them have been dying periodically throughout these lines. What could she switch to that is more winter hardy and stays at the 1 foot tall size?

A. That is a problem with some of our newer mum varieties, they just aren’t as winter hardy as they are advertised to be. The 1 foot tall size is difficult to find, I would suggest a groundcover to stay so small. Most other plants are going to be 2-3 feet tall at least. There would be some nice phlox that would look nice lining a driveway.

10. This caller has an oak tree that was pruned. The pruning is about 20 years old and has recently started oozing. What is wrong with it?

A. The tree could have borers or it could be a slime flux. It would be best to have a Certified Arborist look at the tree to determine what is causing the oozing and what can be done about it.

11. A caller has a mulberry tree with a flower bed underneath the tree. The high number of mulberries are now falling off the tree and rotting on the ground which is attracting flies. Is there anything that can be sprayed to treat for the flies but not harm the tree or the flowers growing underneath?

A. This is difficult since the fruit is already maturing and falling from the tree. If it was caught earlier, the fruits could have been quickly harvested by placing sheets underneath and shaking the branches. Once the fruits are on the sheets, they can be used or destroyed away from the tree if there are too many for consumption. Leaving the fruits to decay around the tree is attracting the flies. Using a sevin around the plants could help reduce the flies, but it won’t eliminate them entirely. Once the fruits have decayed completely, the flies should not be a problem.

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Rust on a Pear tree

12. This caller has an apple tree that gets rust even when they are spraying and then it moves onto their peach tree. What can be done for this disease?

A. Rust is found on apples, crabapples, and pears, but not on peaches. I would say there are 2 different problems. As for the rust, if the timing or chemical formulation is off a bit, the spraying will not work. Be sure to spray the trees with either copper fungicide or orchard fruit tree sprays. These sprays need to be applied every 10-14 days through the growing season starting at bud break, skipping the time frame while the trees are blooming to avoid harming pollinators. As for the peaches, it could be a fruit rot or other disease. The orchard fruit tree sprays will work on those as well, but it would be for a different disease on the peaches, not the rust.

13. A caller has a 6-7 year old apple tree that was girdled all the way around the tree this past winter by rabbits. It seems to still be growing fine, does the death just take a while after damage like this? Will it eventually die?

A. It could be ok, but most likely it won’t live through girdling all the way around the tree. If the damage was minor and the tree is able to seal up the wound, maybe it will be ok. I would say just to keep an eye on the tree and give it time to see if it gets better or worse. If the canopy isn’t full or has top dieback, you would want to remove it before it becomes a hazard.

14. This caller had large hail last week. It hit his vegetable garden. Is there anything he can do for the plants now? Will they survive and produce?

A. This depends on how badly the plants were injured and if the damage is mostly just on the leaves. It is a situation where time will tell, the damage may not be fully present for a while. There is nothing that can be done to fix this type of damage once it gets hailed on.

15. A caller has bare spots in the lawn due to shade under pine trees. What can be done about that?

A. Grass doesn’t grow in the shade. It would be best to use mulch under the trees or try to plant something else that thrives in shade conditions such as carex, sedge, or other groundcover or use shade perennial plants. Remember to plant the right plant in the right place for best growth.

16. This caller has rose with leaves that were eaten off of it. What would do that and how can it be managed?

A. This could be from rose slugs, but the damage sounds worse than what rose slugs do. It could be from Japanese Beetles. Those can be controlled with sevin, bifenthrin, or neem oil applied to the leaves. Be careful to avoid hitting the flowers with insecticide sprays to avoid injuring pollinators.

17. The last caller of the day wants to know how to renovate her strawberry plants?

A. According to John Porter, UNL Extension: She will want to manage weeds, but do nothing to disturb the plants. They should be left to grow until the end of the season. Tilling is okay around the beds, but in the beds hand pulling or minimal cultivation would be ideal to avoid damaging roots. Using a mulch like straw or woodchips can help control weeds in the bed. If the strawberries are a Junebearing variety, they are done producing for the year.  However, if they are a day neutral or everbearing variety they will have more production cycles throughout the season.

 

 

Yard and Garden: June 21, 2019

Yard & Garden blog, 2019

This is the Q&A for the Yard and Garden show for June 21, 2019. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through August 2, 2019. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: Steve Karloff, District Forester for the Nebraska Forest Service

1. The first question of the show was about a Colorado Blue spruce tree that is turning brown throughout the whole tree. It seems to be starting at the ends of the branches. What is wrong with it?

A. This could be that it is simply too wet. The excess moisture this year is causing problems with a lot of our plants. Colorado Blue spruce trees grow best in the conditions in Colorado with a lot less humidity and moisture. Steve has seen quite a few spruces turning brown this year, most likely due to root rot issues from the high precipitation from this spring. Unfortunately, there is nothing that can be done to fix this problem.

2. Can you still prune forsythia shrubs this late into the year?

A. No, it would be better to wait. The general guidelines are to prune spring blooming shrubs within a couple of weeks after they have finished blooming for the year and to prune summer blooming shrubs in the late winter before they bud out for the year. At this point, pruning the forsythia will affect the blooms and it would be too hot to prune in the summer.

3. A caller has cherry trees that he planted in the spring. Now the leaves have wilted and died back. Why did this happen?

A. After discussion it was determined that the trees were purchased from a mail-order service and were delivered bare root. He planted them within a day of receiving them, which is advised because they will dry out quickly with no root ball to hold water. It was advised that he scratch the bark on some small twigs to see if it is green underneath the bark which means the tree is still alive. If under the bark is brown, the tree is dead. It could be an issue from the nursery or through the shipping process. It would be better to purchase trees locally.

He also wanted to know if he could remove the cedar trees on his property to eliminate the problems from cedar-apple rust?

A. No, the spores from cedar-apple rust will spread up to 2 miles. Removing the close cedar trees won’t stop the disease because it would be nearly impossible to find a location in Nebraska where you can get more than 2 miles away from a cedar tree. It is best to just spray susceptible apple trees or plant new trees that are resistant to the disease.

4. This caller has a weed called pineapple weed. Can you use a granular herbicide to control it?

A. Pineapple weed is an annual plant that is often found in poorly maintained areas, typically along driveways or along gravel areas. This weed can easily be controlled earlier in the season with a pre-emergent herbicide such as dimension or another that contains dithiopyr. For post-emergent control, glyphosate products such as Roundup could be used. The granular herbicide will likely not be very effective on pineapple weed.

5. A caller has strawberry plants that are producing very small berries and not a lot of those. It was hit by herbicide drift at one point, but seems to be recovering. Is the herbicide causing problems with fruit production or why are there so few berries that are so small?

A. The herbicide drift may impact the fruit development if it was hit while it was flowering that could have damaged the flowers before they were able to produce fruit. Otherwise, the small fruits are fairly common for the everbearing types of strawberries. Since they continue to produce through the season they will not produce the larger fruits that June bearing plants would have.

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Hollyhock rust, underside of leaf

6. A walk-in listener has a hollyhock plant with a lot of brown spots that are raised bumps on the underside of the leaf. What is causing that?

A. This is hollyhock rust. This is a common problem for hollyhocks, especially in this wet year. Remove the heavily infested leaves if you cannot remove all infested leaves and destroy those. You can use a copper fungicide on the plants to reduce the spread or re-infestation. At the end of the season, be sure to clean up all the leaves and plant material to reduce overwintering location to see less of the rust next year.

She also wanted to know what would cause a row of holes in her canna leaves?

A. This would be from Canna leaf rollers, a caterpillar. They can be controlled with a systemic insecticide applied to the cannas early in the season before the damage begins or by using Bt or Sevin once the damage begins.

7. This caller has an ash tree she would like to save from Emerald Ash Borer. What can be done now to ensure it lives?

A. Wait until Emerald Ash Borer is found within 15 miles of the tree prior to beginning treatments. Treatments are not necessary for an insect we haven’t found in the area. Even if defoliation has began on the tree when it is first identified in the area, treatments can be successful. Each time trunk injections are done they wound the tree leading to more problems.

8. How do you eliminate woodchucks from a garden?

A. They can be deterred with the use of a heavy-duty fence around the garden. The fence needs to be 3 feet tall and made of 2 inch mesh woven wire or heavy poultry wire. They can also be trapped using apples or carrots as bait. For more information on Woodchucks, view this guide.

9. Can you grow an avocado tree in Nebraska?

A. This would have to be an indoor tree. They will not withstand Nebraska winters outdoors.

10. A caller has wild roses that have some dead stems throughout the plant. Should those dead stems be removed?

A. Yes, you can cut out the dead canes of the shrub at any time.

He also wondered about tiger lilies. They were constantly mowed last year and haven’t come back this year yet. Will they come back?

A. If they haven’t regrown yet, it is likely that they have died. I would suggest replanting.

11. This caller has a big, green leafy plant that grows 4 feet tall and 6 feet wide with leaves similar to rhubarb plants. What would that be?

A. This sounds like Common Dock. It can be mowed off or sprayed with a roundup or glyphosate product now. In the fall, you can treat the plant with a 2,4-D product.

12. The last caller of the day has roses with holes in the leaves. What is causing that?

A. This is likely due to rose slugs. They are a common issue right now in roses. They will likely be finishing up their damage cycle soon and then they will pupate and become adult sawflies. The damage is minimal and they don’t need to be controlled with an insecticide which could harm pollinators coming to the rose flowers.

Yard and Garden: June 14, 2019

Yard & Garden blog, 2019

This is the Q&A for the Yard and Garden show for June 14, 2019. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through August 2, 2019. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: Dr. Paul Read, Professor of Viticulture, UNL

1. The first question of the show was what to do to get rid of borer bumble bees that are burrowing into the framing of a shed?

A. These are carpenter bees. Carpenter bees are a good pollinator insect. If they aren’t damaging the structure of a building, they can be left alone. However, if they are digging into framing for a shed or other building, filling the holes in with wood putty should work. Otherwise, you can spray a little sevin in the holes as well. You might also try putting up a Bee Hotel that may be more desirable to them than the structure of your building. View this article on Carpenter Bees for more information. View this NebGuide on Creating a Solitary Bee Hotel to learn how to build and place a bee hotel on your property.

He also wants to know what likes peas? His plants bloomed and then something ate the top third of the plant off. What would do that?

A. This could be deer, rabbits, or squirrels. These are all difficult wildlife to control. Fencing 2 feet high around them will keep rabbits out, the fencing needs to be 4 feet tall to keep deer out. Squirrels can climb the fence, so they are more difficult to manage in the garden. For more information on controlling squirrel damage, view this NebGuide on squirrels.

2. A caller has 4 peach trees, 2 have been producing fruit while 2 have not. Are there male and female peach trees? When will the other 2 produce?

A. Peaches are not male/female trees, they have perfect flowers and are self-pollinating. If they aren’t flowering they are not mature yet. Once they begin flowering they will produce fruit.

3. Are cedars asexual trees?

A. Cedars are dioecious, meaning that they have male and female flowers on separate trees. You can see the difference in the trees in the spring when one tree looks brown while the next tree is green.

4. This caller has roses with holes in the leaves. What is causing this?

A. This is due to rose slugs, which is the immature form of a sawfly. Rose slugs are not terribly damaging. They can cause some defoliation early in the summer months but only for a few weeks and the damage is minimal. Spraying for rose slugs could harm pollinators while the plants are blooming.

Roseslug Collage
The picture on the left shows the rose slug on the underside of the leaf. The picture on the right shows the damage from rose slugs.

5. A caller just planted some gooseberry bushes. What care should be given to them now? Do they need to be cut back annually?

A. Gooseberries require minimal care. Cut out any damaged canes each year, but otherwise, leave them alone.

6. This caller was wondering about a plant called ‘Thuja’. Will it grow ok here?

A. Yes, Thuja is the genus for arborvitae. Arborvitae will grow fine here, but it can be problematic in cold snap winter conditions. They get a lot of winterkill. A local nursery will have varieties that are better suited to our environment than those found in a mail-order catalog.

7. A caller has an American Elm that is dying. Last summer it lost all of it’s leaves early, now the tree looks dead on portions. What is wrong with it?

A. This could be from Dutch Elm Disease. There are still elms in the area that have made it through Dutch Elm Disease, but the disease will catch up with them and kill them. There is no cure or anything you can do to save a tree from Dutch Elm Disease. Remove the tree.

8. This caller has a 14 year old maple tree with branches hanging on the ground making it difficult to mow around. Can those branches be cut back now?

A. Yes, it would be fine to prune it back now. This time of year is beneficial because the wound will seal up quickly with the active growth of the tree. Be sure to make a good pruning cut. For tips on how to make a good pruning cut, view this article from Sarah Browning on Pruning Deciduous Trees.

9. A caller has a rose bush that bloomed good for a while, now it has started to die. The leaves and flowers are wilting. She waters 1 inch per day. What is wrong with them?

A. Watering the plants 1 inch of water a day would be excessive. It would be better to reduce that down to 1 inch of water per day, especially with all of the rain we have been seeing lately. Be sure to add a 2-3 inch layer of mulch to the plants. Don’t fertilize them right now, fertilizing a stressed plant can further stress it.

10. This caller is looking for a source for corn gluten meal for weed control.

A. Try looking at local nurseries like Campbell’s or Earl May. Be careful with corn gluten meal, if too much is applied it can kill desirable plants.

11. A caller is using rural water now instead of rural water that they had used before moving. The rural water smells like bleach, will it hurt the plants? Also, she adds manure every year to it, is the soil causing problems to the plants?

A. The water shouldn’t affect the plants. If there is a concern, you can get the water tested to ensure that it is safe for consumption. Also, be careful just adding manure every year. It would be a good idea to get the soil tested prior to just adding more nutrients. Nutrient levels that are a little high can be just as detrimental as low nutrient levels.

12. The last caller of the day started his tomato plants in the upside down planter. Should he put a cage around them?

A. That wouldn’t be necessary because the plants are going to naturally grow upward. Cages are used on the ground to keep our plants from falling over, these would be held up by the planter.

Yard and Garden: June 1, 2018

Y&G Blog Photo, 2018

This is the Q&A for the Yard and Garden show for June 1, 2018. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through August 3, 2018. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: George Pinkerton, Director of Landscape Maintenance for Downtown Lincoln

1.The first caller of the show wants to know how to control grassy weeds in peonies and in asparagus?

A. In the peony plants, you can spray Grass-b-Gon or another product containing fluazifop-p-butyl to kill perennial and annual grassy weeds. However, this product cannot be used in asparagus. For weed management in asparagus, it is best to use mulch through the season to keep the weeds down. Roundup, or glyphosate, can be sprayed over top of the asparagus in the beginning of the season before the asparagus begins to grow, after harvest once all the stalks have been cut off below the ground level, and at the end of the season after removing the ferns and no green of the asparagus is showing above ground. Preen that is labeled for use in asparagus can be used throughout the season as well to stop the germination of new, annual weeds.

2. This caller has ants on their potatoes and radish with a great deal of damage. What can be done to stop the ants from damaging these plants more?

A. It is likely that the problem is not due to the ants, they are likely there as a secondary issue and they are not eating the potatoes and radish. Grubs will feed on the tubers and other underground structures. They do not typically affect tomato roots or the roots of the other above-ground growing plants. There are no products labeled for grub control in a home vegetable garden. If the grubs are becoming a problem, move the garden next year and treat the area without the vegetables on that area for a year. Treat for grubs in the lawn around the garden to help reduce the population.

3. A caller has had poor pollination in cucumbers in past years. What can he do this year to ensure he has better cucumber production?

A. If there aren’t many bees or butterflies around the garden, it could be low pollination. Try to attract pollinators through additional pollinator garden areas. You can also hand-pollinate these plants with a cotton swab, touching many flowers throughout the plant with the same cotton swab to transfer the pollen throughout.

4. This caller purchased burning bushes in containers and then left for 4 days before getting them planted. Now, the leaves are brown and crispy, are these plants dead or will they pull through?

A. If branches are brittle and break rather than bend, they are likely dead and will not regrow from that. In the late May time frame, it is going to be difficult to keep a newly planted shrub watered well enough in this heat and drought, this will be even more difficult if the plant is not placed into the ground right away. Containerized plants would need to be watered at least once a day now that it is so hot.

5. A caller planted 2 fruit trees and a red maple that they received through a mail-order service. The fruit trees are doing fine, but the maple has not leafed out and is not growing well at all. What happened? Will the tree come through?

A. Sometimes during transportation, bare root trees will dry out and they are not able to recover from that. It is best to purchase your plants locally to ensure this does not happen.

Carpenter Bee, J. Kalisch
Carpenter Bee Photo from Jim Kalisch, UNL Entomologist

6. How do you control carpenter bees?

A. Carpenter bees are a good pollinator insect and will not sting you. If they are doing damage to the structure of a building, you can fill the holes with some caulk or putty. If you would like to, you can inject sevin dust into the holes before sealing the holes to kill the bees. For more information here is a guide from Lancaster County Extension on Carpenter Bees.

7. This caller has Siberian elms growing within a well-established windbreak that are dropping yellow leaves. What is wrong with the trees?

A. It is likely that the trees turning yellow are hackberry trees growing in the windbreak rather than the elm trees. Hackberry trees have recently been dropping leaves like they do in the fall. They tend to do this in the late spring if the weather becomes unfavorable to their growth. They will drop their leaves and then push new regrowth. This is likely due to the quick change to hot/dry this summer.

8. A caller just planted rose bushes and oak leaf hydrangea plants in full sun with a rock mulch. Now the roses have holes in the leaves and the hydrangea plants are getting rush spots. What is wrong with these plants?

A. After a picture was emailed, it was determined that the roses had rose slug damage. Rose slugs are actually the immature form of sawflies that feed on roses this time of year causing brown spots in the leaves and holes. Rose slugs resemble a caterpillar that is translucent green with a brown head and they are found on the underside of the leaf. They are not very detrimental and do not need to be controlled. They are a short-term problem. Also, it is difficult to control sawfly larvae and not harm pollinators in the flowers of the rose. The hydrangeas are exhibiting problems with heat due to being planted in full sun with a rock mulch. Make sure to keep them well-watered to avoid more problems.

5-4-11 (2)
Creeping Charlie in a lawn

9. This caller has a mint smelling weed growing in his yard. What is it and how do you manage it?

A. This would be Creeping Charlie, also called ground ivy. This weed can be difficult to control, but it is best managed in the fall. Many broadleaf herbicides will work for creeping Charlie, including 2,4-D, trimec, tenacity, or triclopyr. It is best to apply one of these chemicals 2 or 3 times in the fall. One application can be made around September 15th with a second application around October 15th. It will take multiple years of this management plan to fully rid the yard of ground ivy.

10. A caller has zucchini leaves that are crisp and curled up rather than smooth like normal growth. What is wrong with the plant?

A. After discussion with the caller, it was determined that she should spread her watering out more. Our vegetable gardens need about 1 inch of water per week, but this should be spread out over 2 or 3 times per week if rain is not providing that water. She also sent a photo to Nicole, where it was determined that this might be due to herbicide drift from a broadleaf herbicide applied nearby. In the heat and humidity we are dealing with currently, it is best to not use broadleaf herbicides anymore now until the fall of this year to avoid volatilization of the chemicals where they turn into a gas and move around to non-target plants.

11. How much water does a lawn need? How do you know how much water you are applying? Should you water in the afternoon to cool the grass off or is that a myth?

A. A lawn need 1-1.5 inches of water per week. If you are not getting that naturally, it is best to apply 1/3-1/2 of an inch 3 times per week to keep the lawn healthy. You can do an audit of your system to know how much you are applying each time you water. Simply place tuna cans or some type of catch device throughout the lawn to catch the irrigation as it runs to determine how much is being applied each time. As for syringing the lawn, no it doesn’t really help the lawn cool off. Lawns transpire as a natural way to cool themselves, and syringing only cools the lawn a few degrees for a few minutes. For more information on syringing, here is a good Turf iNfo article from Bill Kreuser at the UNL Turfgrass Department.

12. This caller has something that is digging large holes in the yard. What would be causing this and how can the damage be controlled?

A. This could be due to a skunk digging up the grass looking for white grubs. Treat the lawn for grubs in the middle to late part of June to help reduce the attractant for the skunks. For more on skunks and how to control them, here is a guide from UNL Wildlife.

13. A caller is looking for a good plant to use to grow up a windmill. Would a vining hydrangea be a good choice to grow on the windmill that is in full sun?

A. No, hydrangea plants don’t grow well in full sun. Honeysuckle would be a good choice for this location. If you can keep the roots a bit shaded, clematis would be another great choice.

14. The final caller of the day wanted to know how long tulips can live?

A. Some of the newer varieties may not live as long as some of the old types. However most will grow for many years.

Yard and Garden: June 3, 2016

Yard & Garden for blog

This is the Q&A for the Yard and Garden show for June 3, 2016. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through August 5, 2016. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: Sarah Browning, Lancaster County Extension

1. The first caller of the day has strawberries that are all developing but they are rotten fruits. What would cause this and can it be fixed?

A. This is probably due to a fruit rot disease that is caused by a fungus due to the high rains this year. At this point in the season, fungicides will not help and you will not get much of a crop from these plants. If this is a problem seen every year, a liquid copper fungicide can be applied next year. You should start spraying the plants at petal fall right after the blooms finish next season. To help with this disease, also use a mulch around the plants and avoid overhead irrigation.

2. A caller wanted to know if wildflowers do better where grass doesn’t grow very well? Can he still plant wildflowers now?

A. Wildflowers don’t really do better where grass won’t grow, but the area to plant wildflowers does need to be prepared for the wildflowers. It is best to clean up the area with a glyphosate product, such as Roundup, then till the area up and seed the wildflowers. This can still be done now, it will be fine through most of the spring and fall months. Unless you are planting annual wildflowers, which will reseed for each year, you will not get many blooms this growing season. It will take a few years to get the wildflowers going well and weed control will be necessary. If you don’t want any grasses growing in the wildflower patch, you can use grass herbicides and not harm the wildflowers.

3. This caller has pansies that are being eaten, the small white dots are on the underside of the leaves. What would this be and how can they be controlled?

A. This could be aphids which can be controlled with eight, bifenthrin, or malathion. However, pansies are nearing the end of their life as they are a cool season plant. So you could just remove the pansies and plant something else to reduce the problem and not have to use pesticides.

4. A caller has been dealing with high populations of grasshoppers recently. They are feeding heavily on his potatoes. What can be done to control them?

A. In the potatoes, you will need to use an insecticide labeled for use in a vegetable garden such as bifenthrin, sevin, or eight. It would also be helpful to keep the grass mowed around the garden and to treat it with some of these insecticides. Also, grasshoppers are often found in roadsides, so be sure to spray these areas as well to help reduce the overall population.

5. When can peonies and iris be cut back?

A. You can cut off the flower stalks on both of these plants as soon as they are done blooming. However, you need to wait until they die back in the fall before removing any leaves from the plant.

6. This caller has a lawn with patches of darkened areas throughout it. What would cause this?

A. Walk through the dark areas to see if the blades pop back up. If the blades stay down after they are walked on and you can see you footprints, it is due to drought stress and the lawn needs to be watered. Also, look closely at the leaf blades to see if there are small, black/gray structures like tiny balls. This would be slime mold which is also showing up in the lawns now. Slime molds are not a serious problem to the lawn.

7. This caller has a weeping willow. He wants to know if he can prune the branches up so he can mow underneath it?

A. Pruning for a weeping willow is best done in the fall but it can be done now. You can limb it up and shorten some of the branches to make it more accessible for mowing. However, don’t remove more than 1/3 of the plant in one growing season.

8. A caller wanted to know about mosquito control. He had found a recipe online that was with household items and it claims to control mosquitoes for 80 days. Will this work?

A. No. The best control for mosquito control outdoors only last for a few days. It is best, if you are having an outdoor BBQ, to spray the lawn and shrubs around the lawn up to 2 days prior to the event for management of mosquitoes. You can use sevin or eight or malathion or bifenthrin for control. Be sure to use bugspray containing DEET while outdoors. Also, make sure you have no standing water in your lawn to reduce the population of mosquitoes.

Roseslug Collage
Rose slug on the leaf on the left, damage from rose slugs on the right.

9. This caller has roses that have leaves that look shredded or with many holes in them. What can be sprayed on the roses to help them with this problem?

A. This was brought into the extension office later for identification. It was rose slugs. These are small, translucent, green caterpillars with a brown head found on the underside of the leaves. Rose slugs are actually the immature of a sawfly and not a slug at all. They are mostly damaging to the aesthetics of the plant and are not that harmful but they can be treated with sevin dust on the underside of the leaves if they are heavily damaging the plant. Be careful to not get the sevin on the flowers to not harm bees.

10. What digs holes 6-7″ deep straight down into the mulch around trees?

A. This could be either squirrels or skunks or possums that would be digging for insects. Clean up around the tree to help deter the animals.

11. The final caller of the day has a cedar windbreak with a lot of scrub trees growing among the cedars. How can those be controlled?

A. It is best to just cut off the scrub trees and do a stump treatment with a concentrated roundup product. Spraying in the windbreak can damage the cedar trees.