Yard and Garden: June 30, 2017

Yard & Garden for blog, 2017

This is the Q&A for the Yard and Garden show for June 30, 2017. 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 July 28, 2017. 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: Connie Fisk, Cass County Extension Educator

If you enjoy reading my Q&A from the show each week, take my quick survey at: http://go.unl.edu/44qr and be entered to win a free plant book or some free UNL gifts.

1.The first caller of the day wanted to know if he could fertilize his tomatoes, potatoes, and cucumbers with the same fertilizer?

A. Yes, the same product could be used for all three of these crops. Be careful when fertilizing to not use too much Nitrogen during the bloom period which will cause the plants to grow large but not produce any fruits. Also, too high of Nitrogen for the plants can lead them to grow large and dense which can lead to more fungal diseases.

2. A question came through email asking what would cause red spots on strawberry leaves?

A. This could be either due to leaf scorch or leaf blight. The leaf scorch will have red spots that have a red or purple center and the leaf blight will be a red spot with a gray center. For both of these diseases, you can use Captan fungicide.

strawberry leaf diseases comparisons

3. How soon can peonies be cut off?

A. Peony leaves should be left on the plant through the growing season and can be removed in the fall when the leaves turn yellow. Otherwise, this time of the year you should only remove the flower stalks. Leaving the leaves on the plant will help the plant build sugars to help it bloom early next year.

4. A caller planted Karl Forester Reed Grass in 2 locations in his landscape at the same time this spring. One location, the grasses are doing well, but in the other location, the grasses are much smaller and not growing well. The worse plants are on the east side of the house while the good grasses are on the west side of the house. What would cause them to grow so differently?

A. The east side of the house would be in more shade than those plants growing on the west side. Most of our grasses like to be grown in full sun, this difference in sunlight could cause the difference in growth. Because they are in different locations, a nutrient deficiency could be causing the few on the east side to be growing less. Add a general fertilizer to help with growth.

5. This caller is applying a fertilizer with 24% Nitrogen every 7 days to her tomato plants. Is this too high of a percentage of Nitrogen for the plants to grow well?

A. The percentage isn’t as important as how much is applied. Applying a fertilizer every 7 days is too often. For most vegetable gardens, fertilizing three times a year will be sufficient. With this high of Nitrogen in the soil the plants will not produce and may grow too large and develop diseases in the deep canopy.

6. A caller had golf ball sized hail a couple of weeks ago that hit his tomato plants. The plants are still growing and have leaves on them. Will they be ok?

A. Yes, they should be fine. Keep them mulched to help reduce competition with weeds and keep them uniformly watered as needed. Don’t fertilize the tomatoes because they are stressed from the storm damage and fertilizing a stressed plant will increase the stress.

7. This caller wondered if grass clippings will negatively affect the soil in his vegetable garden? He had been using the grass clippings for a couple of years and now his vegetable plants don’t look as healthy as before he started using grass clippings.

A. After discussions, the caller said he had been using herbicides on his lawn and using the grass clippings on his garden. Pesticides can have a long residual on the grass clippings and this can negatively affect the plants. Especially if he was using broadleaf herbicides such as 2,4-D for dandelions. Broadleaf herbicides will damage vegetable plants which are all broadleaf plants. It would be best to avoid using his grass clippings if he is to continue using herbicides on his lawn. He can use other types of mulch such as straw, woodchips, newspaper, cardboard, or grass clippings from a neighbor who isn’t using herbicides on his or her lawn.

8. A caller has hollyhocks that have copper colored, round spots on the leaves and the leaves are falling off. What is the problem and what can be done to improve the flowers?

A. This is likely due to hollyhock rust, a common fungus of hollyhocks. Remove the leaves as they develop the disease and destroy the leaves and plant parts removed in the fall cleanup. Fungicides can be used if necessary, such as a liquid copper fungicide.

9. Do weeds need to be controlled in sweet corn or will the plants grow tall enough and shade them out soon?

A. Weeds should always be removed to reduce competition and lead to better overall plant growth. You can hoe the weeds out and use mulch between rows.

10. This caller has squash plants growing in black containers that are growing in potting soil. They are not thriving, what could be the problem?

A. The pot could be getting too hot because it is black. It would be beneficial to add mulch around the container or paint it another color to keep the roots cooler inside. It also could be drought stressed. Plants grown in a container get drought stressed sooner and need to be watered more than those growing in the ground because they have more limited root space. It also might be beneficial to add a general fertilizer to help the plants grow better.

2015-04-15 11.03.06

Kabatina Tip Blight

11. A caller has flagging on cedars that is causing the tips of the branches to turn brown. What would cause this damage to 20 year old cedars?

A. This could be due to bagworms which would be very small yet. Bagworms can be sprayed with any general insecticide. It also could be due to drought stress or Kabatina tip blight. There is no fungicide control for Kabatina. The best management is to cut out the affected areas.

12. This caller has sweet corn growing in his garden. The corn is about 2 feet tall and is now tasseling and it is very light colored. What would cause this problem? He is watering his garden for 1.5-2 hours every night.

A. This is likely due to overwatering. Vegetable gardens need about 1 inch of water per week, watering every night is not necessary and that much water would cause the nutrients to leach down through the soil, which would account for the lighter green coloration. The corn will likely not produce this year since it is already tasseling.

13. A caller wondered if the wood chips being produced from all of the downed trees would be safe to use as mulch around living plants or if there would be an issue with insects in the mulch?

A. This would make a good mulch for your plants. If there was an insect in the trees being chipped, the chipping process will kill it.

14. This caller has grapes that were hit by herbicide drift this spring. The leaves were all the size of a nickel and deformed, but the plants are not pushing new growth. What should they do to help the grape plants make it through this stress? Should they fertilize the plants?

A. Unfortunately, grapes are very sensitive to herbicide drift. 2,4-D can drift about 1/2 miles and Dicamba can drift about 1 mile, so it can move from a long way and grapes will be the first to know. If these are mature plants and they are pushing new growth, they should be fine. Don’t fertilize the plants, this will add more stress to the situation. Keep them well watered to help them through.

15. A maple tree was recently hit by hail. Now the trunk and branches have wounds on them. Should anything be done to cover these wounds?

A. No, don’t apply anything to the tree or cover the wounds with anything. Allow the tree to go through it’s normal processes to seal up the damage to reduce decay further into the trees.

16. A caller has cantaloupe plants that are not growing well. They have very small leaves but they are flowering already. What can be done to help them grow better? They are growing in a garden with many other vegetable crops that are growing much better.

A. Remove the flowers that are developing on such a small plant. When plants try to push flower growth and fruiting, they reduce their growth. Removing the flowers will push the plants to try to grow more before they begin flowering.

17. This caller is growing strawberries that have been growing for a few years. They bloomed and looked healthy this year, but the strawberries produced were very small. What would cause this problem? Also, what will help stop strawberries from rotting if they ripen on the ground?

A. The plants should be thinned at the end of the year to help increase the size of the berries. They also could be dealing with an issue of poor pollination. The cool, wet weather this spring led to low pollination because the bees don’t like to fly in the rain. Poor pollination may lead to development of the fruits, but at a much lower size than normal. Poor pollination can also cause the plant to drop small fruits from the plant before they mature. Mulch the strawberry beds with straw to help keep the berries from laying on the soil and rotting as they mature.

18. A caller from the Geneva area has an ash tree. Should he be treating for Emerald Ash Borer now?

A. No, Emerald Ash Borer (EAB) has only been found in Greenwood and Omaha in Nebraska and we recommend waiting until the beetle has been found within 15 miles of your tree before beginning treatments to reduce injury to the trees and to reduce the amount of insecticides in the environment. There is no need to treat for a problem that we don’t have yet.

19. This caller has one apple tree and needs to get a second tree for pollination. What would be a good variety?

A. It is necessary to plant a second variety of apple tree to help increase pollination. Look at the local nurseries to find good choices that go with the variety you already have planted. They will have a chart to show which trees pollinate which.

20. A caller has a fungus in the lawn every year. This fungus shows up in different locations throughout the yard every year and she treats with a fungicide every year. Is there anything she can do to make it so she can stop treating every year?

A. If you see the fungus in your lawn every year, you would need to treat for it earlier in the year before the fungus appears. If the fungus is present before treatments begin, they will not stop the damage that is already present.

*A caller later on the show suggested that these spots may be due to a dog urinating in the lawn, which can cause brown spots similar to many of our summer fungal diseases. There is no way to stop the brown spots left after a dog urinates on it, you would need to walk the dog somewhere else to do his or her business.

21. The final caller of the day has tomatoes that are growing well and they are now 3.5 feet tall, however, they have no blossoms on the plant. What would cause this?

A. This would be due to high Nitrogen levels in the soil. It cannot be fixed at this time, but don’t add any additional fertilizer to the garden for a couple of years to bring the level back down.

Yard and Garden: June 23, 2017

Yard & Garden for blog, 2017

This is the Q&A for the Yard and Garden show for June 23, 2017. 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 July 28, 2017. 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 Hosts: Mike Onnen, Manager for the Little Blue NRD & Donnie Engelhardt, Assistant Manager for the Little Blue NRD

If you enjoy reading my Q&A from the show each week, take my quick survey at: http://go.unl.edu/44qr and be entered to win a free plant book or some free UNL gifts.

1.The first caller of the day wanted to know if it was time to spray for bagworms yet this year and what to use for bagworms?

A. Yes, the bags have emerged. There is time for a couple of weeks yet to get them sprayed, just make sure you spray before the bags are 1 inch in length for best control. You can use any general insecticide for controlling bagworms such as sevin, eight, bifenthrin, tempo, or Bt can be used for a safer control method. Bt will not harm bees and other beneficial insects.

Bagworm4

Bagworm

2. A caller has 2 large oak trees that when he parks his truck underneath it gets sticky from the aphids in the tree. What can be done to manage these?

A. The aphids are producing honeydew as an excretion and they do feed on the oak trees, but often this is not that damaging to the tree. You can spray for the aphids in the tree with a general insecticide, but if you give it a little time predatory insects will come in and kill the aphids. If you spray, you will kill the predators as well as the aphids. It is often not necessary to spray for aphids in a tree.

3. This caller has lilies that have grown too thick in her one garden bed. When can she divide these to transplant some in a new location?

A. This could be done this fall or you can wait and thin the lilies in the spring as well, either would be fine. I would advise against transplanting and dividing plants this time of year because in the heat, the plants don’t have enough roots to get to more water to keep them cool.

4. A caller has a weeping willow that has many leaves turning yellow and the tree is thinning. What would be wrong with the tree and how can it be managed?

A. This tree is likely dealing with environmental stress. There are not spots on the leaves to indicate a disease or damage that would be from insects. After viewing the photos, it is determined it could be due to improper planting as it looks too deep with no root flare. There may be stem girdling roots that would not be evident for a few years after planting.

5. How do you control ground squirrels in your yard?

A. There is a great publication on Ground Squirrels from the Internet Center for Wildlife Damage Management which shows how to set a trap for ground squirrels.

6. A caller has Iris, yucca, and prickly pear cactus that are all getting many weeds growing in and around these plants. The weeds include both grasses and broadleaf weeds. How can the weeds be controlled without injuring the desired plants?

A. The grasses can be sprayed with Grass-B-Gon or another similar grass herbicide. Unfortunately, there isn’t a selective herbicide that will kill broadleaf weeds and not kill broadleaf desired plants. For the broadleaf weeds, the best defense is to hoe the weeds out and mulch the garden in the future to hold the weeds back.

7. This caller has a plum hedge that has holes in most of the leaves throughout the hedge. The holes form initially as a brown spot and then a hole appears. What would cause this?

A. This is likely due to herbicide drift. There is no control for that, but if it is minimal it shouldn’t impact the hedge too much. However, multiple years of herbicide drift to the same plants can start to stress and in some cases kill the plants.

8. A caller has onions that have formed a soft, brown spot on the onions when they were dug recently. What would cause this?

A. This is likely a rot issue that developed from a pathogen in the soil. It is always best practice to rotate the crops. Also, ensure that you properly cure your onions before storage.

9. How can you control sandburs?

A. Crabgrass control in the spring will work for sandburs as well as foxtail and crabgrass. All of these are annual grasses.

10. A caller has tried to plant roses in the same location for a couple of years now and it seems like they grow to about 18 inches, bloom, but then die over the winter months. The are planted in a garden with rock mulch, watered with a bucket of water as needed, and were pruned off in March. Why can’t the caller get the roses to live longer than one year?

A. This sounds like mostly environmental stress to these plants. Rock mulches are hot and absorb no water, switch to a wood chip mulch to cool the roots and hold moisture. Watering should be done with a soaker hose or other type of sprinkler system. When a bucket of water is poured over the plants as needed, the water fills up the top pores of the soil surface quickly and then spread out rather than down. A slow trickle on the plants for a while each week to wet the soil down to about 6-8 inches will be more beneficial. Pruning of roses is best done in the middle of April once growth has begun further to ensure healthy wood is not also removed with the dead wood too early in the spring. Add extra mulch around the plants in the winter months, up to 4-6 inches deep in the winter months, then spread the mulch out to 2-3 inches deep during the growing season. Extra mulch in the winter will help protect the plants from inconsistent temperatures in the winter.

11. This caller wants to know when to dig up garlic? He also wants to know if bleeding hearts can be cut back now?

A. Garlic should be harvested in July after 30-50% of the leaves have died back. Harvest during dry weather and leave the bulbs on the ground to dry for a week before storing. The flower stalks of bleeding hearts can be removed, but the leaves need to be left on the plants to build sugars for next years growth and flower production.

12. How can grasshoppers be controlled if they are in the flower garden?

A. Any general insecticide will work for grasshoppers in flower gardens. Sevin, eight, tempo, bifenthrin, and others will work for flowers. When treating grasshoppers, it is also important to treat the grassy areas of roadsides and ditches where grasshoppers are often found.

13. This caller has grass growing in his asparagus patch. How can the grass be controlled?

A. Hand pull and apply a mulch to the asparagus patch. The earlier you get the mulch applied in the season, the better the control will be. Also, after harvesting is complete, the asparagus can be snapped off below ground level and Roundup or another glyphosate product can be applied as long as there is no green asparagus above the ground.

 

Grasshoppers, J. Larson

The four main pest species of grasshopper in Neb. Top row two striped grasshopper adult, red legged grasshopper adult. Bottom row differential grasshopper adult, migratory grasshopper adult.

14. How can you control grasshoppers in the vegetable garden?

A. Sevin, eight, and bifenthrin are labeled for use in the vegetable garden. Also, remember to treat for grasshoppers in tall grasses along roadsides and ditches. Follow the PHI (pre-haravest interval) to know how many days after application necessary to wait to harvest the vegetables.

15. A caller wants to know when to transplant peach trees?

A. Fall or spring are both good times to transplant any trees.

16. The final caller of the day has a pond with moss or duckweed in it making it cloudy. What can be done to clean up the water?

A. Avast SRP is labeled for Duckweed and Copper sulfate can be used for Algae.

Yard and Garden: June 10, 2016

Yard & Garden for blogThis is the Q&A for the Yard and Garden show for June 10, 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: Paul Hay, Gage County Extension

1. The first caller of the day has a small Dwarf Alberta Spruce that is turning brown. What would cause this?

A. This would be from spider mites. This particular tree species is very susceptible to spider mites. They can be controlled with a strong spray of water or insecticidal soaps, horticultural oils, or a general insecticide such as a permethrin product.

2. This caller wanted to know if it was still ok to apply the second fertilizer application for the lawn?

A. Yes, you can do one around Memorial Day. I would suggest waiting until after this heat wave passes through and make sure the lawn is well-watered when you do fertilize, so you don’t fertilize to a drought-stressed plant which can cause leaf burn.

3. What would cause Clematis leaves to turn yellow, the plants still bloomed fine this year?

A. Clematis has a problem with Iron chlorosis. This could be iron chlorosis which can be treated with an iron fertilizer.

2015-09-22 18.45.39

Squash bugs on zucchini

4. A caller wanted to know what the best control for squash bugs in the garden would be?

A. Squash bugs will become active soon. Look on the underside of the leaves of your cucurbit plants such as cucumber, zucchini, squash, pumpkins, and melons. Squash bugs lay their eggs on the underside of the leaves. If you find the eggs, squash the eggs or remove the leaves. You can also spray for them. Spray on a rotation of every 10-14 days throughout the growing season. Switch between at least 2 of the following: sevin, eight, or bifenthrin.

5. This caller has rocks near the lawn and near some trees. There are weeds growing up through the rocks. Can glyphosate, or Roundup, be used around these trees?

A. If the trees are not close enough to be spraying directly on the trunk or leaves, then it will be fine. Glyphosate is not mobile through the soil like some chemicals.

6. This caller wanted to know what to do about the gnats outside? He cannot go outside right now without being attacked by gnats.

A. There is no longterm cure for gnats, much like mosquitoes. Using bug sprays, especially those containing DEET, will help the most. If you have an outdoor event coming up, you can treat the lawn and surrounding plants with sevin or other general insecticide, but these will not last for more than 2-3 days.

7. Is it too late to plant sweet potatoes? What can you do about grasshoppers in the landscape?

A. No, it is not too late to plant sweet potatoes. This is a warm season crop that really doesn’t like the early spring planting. They will do fine if planted in late May to early June. For grasshoppers in the landscape, they can be sprayed with any general insecticide. If in or nearby the vegetable garden use sevin, eight, or bifenthrin for safety of the produce. Be sure to spray the insecticides in the ditch, roadside, and fence rows where grasshoppers are found in high numbers.

8.  This caller has hemlock in the pasture. Is it poisonous? How can he control it so his cattle don’t eat it?

A. Yes, poison hemlock is poisonous if eaten, not if it is touched. Cattle can be poisoned by it, but they typically don’t eat the poison hemlock if there is an alternate food source. Use 2,4-D or Grazon in the pasture to control poison hemlock or dig it out.

*Don’t use 2,4-D this late in the season around landscape plants and never use Grazon or other products that contain Tordon in a landscape setting.

9. A caller has common mullein in his pasture. How can it be controlled?

A. Common mullein is best controlled with 2,4-D or Grazon. Make sure you spray down into the heart of the plant to get the chemical past the hairy leaves. It is best to spray the smaller plants, it would be too late to spray the larger plants that already have a flower stalk on them. Removal of the flower stalks will help reduce seed production from the full grown plants.

10. This caller has a 16 foot river birch that was planted last fall. Now the leaves have turned yellow and are beginning to fall off of the tree. Can it get too much water? What would cause this problem? She hasn’t been watering the tree much yet since it was planted in the fall.

A. Yes, plants can be overwatered to cause death. Newly planted trees need to be watered because they have no root system developed. A tree that was transplanted at this large of a size is going to have a great deal of transplant shock to overcome. Water was sitting in the hole when the tree was planted, so there may be an issue with water draining from the location. Use a probe or long screwdriver to see if the tree needs water. Push the probe into the soil 12-18 inches, if it goes in easy it doesn’t need water, if it is hard to push the probe in very far, the tree needs to be watered.

11. The final caller of the day wanted to install an electronic timer for watering his garden. What would be the best time to set his timer to water his garden?

A. 4 am-10 am is the best time to water any plants. This helps to water the plants while they are already wet from the dew period. It also helps to water early in the day so that the plants will dry out before night. Plants that are wet and cooler overnight introduce a great environment for diseases to occur. To reduce diseases, it is best to water early in the morning.

Yard and Garden: May 13, 2016

Yard & Garden for blog

This is the Q&A for the Yard and Garden show for May 13, 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: Fred Baxendale, Horticulture Entomology Specialist, UNL

1. The first caller of the day wanted to know when to transplant Peonies? She also wanted to know if she moved them away from the black walnut tree would that help them grow?

A. It is best to transplant peonies in the fall, but it can be done in the spring as well. It would be fine to move them in the spring as well. It would be beneficial for the plant to be moved away from the black walnut tree to get away from the toxicity produced by the tree as a form of natural weed control for the tree to other plants. Black walnuts produce Juglone which reduces growth and, in some cases, kills the other plants so the black walnuts have less competition for water and nutrients. Planting things 50 yards from the tree will get it out of the zone where damage can occur.

2. A caller has a rose that is old and has grown to 6 feet tall. When can he transplant it? Also, what are the red “ticks” he found around his gardens when he has been working in them recently?

A. Roses are hard to transplant. Do the transplanting in the early spring of the year and take as much of the rootball as can be dug up when it is moved to help the shrub overcome the transplant shock. Maintain adequate water once it is moved. The red “ticks” would be clover mites. These are not damaging to the plants but can leave red marks on house siding and if inside on the walls and curtains. You can treat these with permethrin or insecticidal soap.

3. This caller has Peonies that accidentally got cut back drastically this year. Will they live through this and should she do anything for them?

A. They should be fine but they probably won’t bloom this year. Make sure they are adequately watered and they will regrow by the end of fall. They should be fine again next year.

EAB Damage Collage

Signs of an Emerald Ash Borer Infestation from Boulder Colorado

4. A caller has 2 ash trees in her yard. She has heard about Emerald Ash Borer and wanted to know if there was anything she could do to protect her trees?

A. Emerald Ash Borer (EAB) has not been found in Nebraska and we recommend waiting until EAB has been found within 15 miles of your trees before you begin treating them. It takes 2-4 years for the damage to show up in our trees once it is here, so you will have time to treat them when it does get here. In the meantime, don’t move firewood here from other locations and increase the diversity in your landscape to help fill in holes that may appear when EAB takes out your ash trees. Also, watch your trees for signs of EAB including top dieback, suckering at the base of the tree, increased woodpecker damage, bark falling off, and D-shaped exit holes and alert Nebraska Extension if your trees exhibit any of these signs of damage.

5. This caller has a 10-year-old red maple that has struggled to leaf out the past couple of years. The middle of the tree is entirely void of leaves. Should he remove the center of the tree?

A. Removing the center will not fix the problem. This could be a root issue or it may have been improperly planted which would take around 10 years to show signs of damage. This tree is near the end of its life and removal of the entire tree should be contemplated. There could be borers in the tree but that would be a secondary issue and using an insecticide on them wouldn’t fix the whole problem with this tree.

6. This caller planted a Bradford Pear 2 years ago, it is leaning now. What can be done to correct the leaning?

A. Don’t stake the tree to try to pull it back to the correct position. When we stake a tree to try to pull it back upright, this can cause a girdling issue to the tree and it is very damaging to the tree. Because this tree has only been planted for 2 years, it would be a good idea to try to dig it up and reposition it.

7. A caller has steep hills around his yard and doesn’t want to have to mow it. What groundcover choices would he have to grow instead of grass?

A. Buffalograss, dwarf sumac, crown vetch, or potentilla would all be good choices for this type of growing environment.

8. A caller wanted to know if she could use vinegar for weed control in the flower garden?

A. It is best to use pesticides that are labeled for use in the garden. Pesticides for weed control have been rigorously researched to ensure that they work properly and cause limited harm to the environment if applied correctly. When we use non-gardening products in the garden, there isn’t always research to know how those products will work in the garden and it may cause more problems to our plants or it may cause problems if they get into stormwater. If you want to avoid pesticides, it would be better to use cultural and mechanical methods of weed control such as hand pulling and using mulch for weed control.

9. This lady has ant hills in her lawn, what can she use to control them?

A. Ant colonies would be spreading now. Leave them alone now, but if they start to overrun the lawn or come inside, you can spray them with permethrin or bifenthrin. If they are not taking over the lawn, they are a predator insect so if you don’t need to control them, they can be beneficial for other bad insect management.

10. This caller has a barberry that she wants removed. Should she call Diggers Hotline before digging it up? Also, how can she remove and kill daylilies growing in her landscape?

A. Always call Diggers Hotline before you do any type of digging. It is a free service that will help you before a problem occurs. As for the Daylilies, the best option is to dig them up. Using pesticides on them would need repeated applications over many years. When you dig them up, you can offer them to your friends and family.

11. How can you control bromegrass in flowers and in strawberries?

A. In the flower garden, you can spray a Grass-B-Gon product to control the grass and not harm the flowers. Do not spray this to where it hits your lawn or any ornamental grasses. As for the strawberries, this product is not labeled for use in strawberries or other edible crops, so mulching and hand pulling would be the best option. You can also paint Glyphosate (Roundup) products on the leaves of the grass among the strawberries and not harm the strawberries.

crane fly, David Cappaert, Bugwood

Crane Fly photo by David Cappaert, Bugwood.org

12. What are the giant mosquitoes this caller has been seeing flying around? What do they do? Are they mosquito killers?

A. These would be crane flies. They are not harmful to us. They feed on nectar when they are adults, but can sometimes be a problem in the turf. They are not mosquito killers, they are in the same order as mosquitoes and look like a large mosquito, but do not eat them. The immatures live in moist environments.

13. Would it be ok to spray a 2,4-D product this weekend?

A. Yes, 2,4-D can turn into a gas and spread to non-target plants if the temperatures for 72 hours after spraying is above 80 degrees Fahrenheit. So, with this cool down predicted where the temperatures will be in the 60’s for the weekend, this would be a great time to spray. Just make sure that the wind speeds are very low.

14. This caller has onions that the tops are dying back on. They tops curl up and die, why is that?

A. Onion thrips can cause streaking on leaves, this may be from onion thrips. Onion maggots will feed on developing bulbs as well. It could also be from a root rot issue. Dig up one of the onions that are not looking healthy and inspect the bulb for signs of insects or disease.

15. A caller has a recently planted black oak tree that has all of the leaves stripped off of it.

A. It could be from canker worms. They are a short-lived problem in our oak trees. Using the Eight product will help to control them.

16. This caller transplanted walking/winter onions. The bulbs are developing below ground and on top they are flowering but not developing the bulbs on top of the plant. What would cause that?

A. Try to fertilize the plant to help it with nutrients that may be missing from the growth of the plant.

Fall Yard and Garden Issues

Fall will be here before we know it. Take the time to read this to help you through all of your horticulture and insect issues during the fall months.

Bare lawn in need of overseeding.

Bare lawn in need of overseeding.

For fall lawncare, September is a good month for overseeding, fertilizing, and aerating your lawn. If you have bare spots from the floods or have a thin lawn, you can overseed in the month of September, before the 15th will have better establishment before winter, Kentucky bluegrass and tall fescue are the best choices for seed in Nebraska. Remember to fertilize with the holidays, and Labor Day and Halloween are coming up for our final two applications for this year. If your lawn has a deep thatch layer, over 1 inch, you may need to aerate your lawn, fall is a good time for aeration as well.

Weeds in a lawn

Weed control is better in the fall. Many of our perennial weeds and winter annuals will get much better control if they are treated in the fall. This year has been a great growing season for many of our lawn weeds, especially clover. Perennial weeds such as Dandelions, creeping Charlie or ground ivy, and clover, are best controlled in the fall with either 2,4-D or Triclopyr products. Remember to apply these chemicals on days when the temperatures are predicted to be at or below 80 degrees for 72 hours. This is the time of the year when these weeds are taking their nutrients back into their roots for next season’s growth, so they will take the herbicide with them to get a better kill. The winter annuals such as Henbit are just beginning their growth in the fall so it is best to treat them now rather than in the spring when they are almost done with their growing season.

It is finally getting close to the time of the year when we can begin cutting back our perennial plants. Once these plants die back in the fall, when their leaves turn brown, we can cut them back for the year. Peonies and Iris are two plants that should be cut back in the fall to avoid diseases spreading from this season to next since these plants tend to get leaf spot diseases annually. When you go to remove the spent leaves, you can also divide these plants and transplant them if you need them in a different location. Avoid pruning roses and butterfly bushes until the early spring to avoid problems with moisture getting into the hollow stems of these plants. If you have a shrub that blooms early in the spring, such as lilac, forsythia, weigela, some spireas, and some hydrangeas, wait to cut those back until after bloom next spring to avoid removing flower buds that are already on the shrub for next year.

Center photo by S. Cochran, Lancaster County Extension

Center photo by S. Cochran, Lancaster County Extension

Watch for fall invading insects in your home in the fall. This is the time of year when many insects will begin to invade our homes. As it begins to get cooler outside, insects move into our homes to stay warm. Many of the insects we see in the fall inside our homes include boxelder bugs, Asian multicolored ladybeetles, stinkbugs, spiders, millipedes, centipedes, and ants. These insects are mostly just a nuisance to us when they come into our homes. The best control for these would be to seal up all cracks where they can enter our homes and to use the insect barrier sprays around the home, especially around doors and windows.