Saturday, June 23, 2007, QA1123A
Q. Worms Eating Tree Leaves - Some of our shade trees have worms eating the leave and also formed webs. What can we do to get rid of them? Thanks. M. G.
A. The critters in question are eastern tent caterpillars. These insects may be controlled by a wide range of gardening aids including products containing the biological active ingredient BT. Remember to read and follow label directions on whatever product you decide to utilize. To achieve desired control it is necessary to penetrate the web because it acts like a protective tent. This may be done by physically tearing oper the webs with a long pole or high pressure water. Small clusters of these visitors may be pruned out of small twigs with a pole pruner.
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Saturday, June 23, 2007, QA1123B
Q. Lawn - Our lawn has some areas that are thin. How can we make it thick? Is now an OK time to plant new grass? – G. K.
A. Now is a good time to plant our warm season southern lawn grasses. Bermuda, St. Augustine and zoysia may be planted from sod or plugs. Bermuda may also be planted from seed.
Mowing frequently is considered one of the most important cultural practice to help lawns to become thick. Mow frequently enough to remove 1/3 of the grass blade’s height with each mowing.
If your grass is not actively growing, nitrogen(N) may not be available in the root zone. Nitrogen and other plant nutrients may be determined by a soil test. Contact your local County Agent’s office for soil sample containers and instruction sheets. Follow the test recommendations.
One other item on thin spots in the lawn. Light. Without sufficient sunlight lawns will develop thin spots. This also includes St. Augustine grass because it needs four hours minimum full sun to grow well long term.
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Saturday, June 23, 2007, QA1123C
Q. Daylilies - We had some deer chew on our daylilies bloom stalks and they are brown. Is it Ok to cut them off? – F. K.
A. Yes. Use a sharp pair of bypass pruners and follow the bloom stalk down into the plant’s foliage and cut it off.
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Saturday, June 23, 2007, QA1123D
Q. Lantana - Will lantana grow in shady areas? I love the blooms but all my beds are shady part of the day. Thank you. – S. T.
A. This group of plants do best in full sun. They usually bloom acceptably well in six hours of full sun. And I’m with you on the blooms.
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Saturday, June 23, 2007, QA1123E
Q. House Plant - I have an office with no windows. What houseplant if any could I grow in this type of condition? – R. L.
A. Spathiphyllum or closet plant and Aglaonema or Chinese evergreen are two of the very best low light tropical houseplants. I have one of each in my no sunlight office and they have been there for four years. Give one or both a try, I enjoy them both.
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Friday, 29th June 2007, QA1124A
Q. Worms in trees - How do we get rid of the worms in our trees? They are awful! Please advise. Thank you. - T. D.
A. The current problem with “worms” in our trees throughout Texas is the webworm(Hyphantria cune) caterpillar. The webs serve as their home bases and are water repellant.
While they may not be attractive and a current pain in the landscape they will go away on their on. Yes, they will munch up some foliage and leave some waste by product. However, usually no long term damage to our shade tree results from their visits.
If desired they may be controlled by a wide assortment of gardening/horticultural aids on the market today at local nurseries, garden centers hardware stores and farm stores. The difficulty in applying an aid is to reach the sites of the problem areas and penetrate the webs. Physically disturbing or opening the webs prior to applying aids according to label directions is a best management practice that should be utilized.
Webs are opened by long poles of various types and high pressure. If the webs are relatively low most home owners can disturb the webs, apply aides and achieve the desired results. However, most of us do not have power equipment to reach 50 feet or more to the tops of tall pecan, oak or other tall growing selections of shade trees.
If this is your situation the choices are; leave the situation “as is” or hire a professional State of Texas licensed pest control firm. Several of these firm should be available in your local yellow pages.
More information on the critters is available at: http://dallas-tx.tamu.edu/hort/Links/Links.htm then click on; http://citybugs.tamu.edu/ and Webworms Active Now. This will take you to a Fact Sheet posted by Mike Merchant, PhD, Professor and Entomologist with Texas Cooperative Extension, Texas A & M University System.
Personally, I do nothing with them. However, like life the choice is yours.
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Friday, 29th June 2007, 1124B
Q. Redbud leaves turning yellow - I have a redbud and its’ leaves are turning yellow. I’m concerned and what should we wd? - G. K.
A. It’s not surprising that more trees and/or other landscape plantings are not having troubles with leaves turning yellow. The most likely cause is to much rain.
In heavy clay soils there is no place for the water to rapidly drain and this year some locations are small lakes for several days. In these situations landscape plants may me impacted and their problems are most often expressed in leaves. They may drop, shrivel, turn brown, become yellow or all the above.
The treatment? Dry weather. One optional physical cultural activity to aid oxygen in reaching this or any other tree’s roots is to aerate the drip line area of each tree in stress. Multiple holes may be punched in the drip line area by you or a contractor.
No fertilizer or other gardening/horticultural aid is needed in this situation. Less rain, time and oxygen into the soil should provide relief.
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Friday, 29th June 2007, 1124C
Q. Weeds in Lawn - We have weeds in our lawn and want to get rid of them. What do you recommend? - F. E.
A. The best weed control for our lawns is a thick vigorously growing turf. This is accomplished by:
- Planting well adapted grass varieties used as lawns
- Sufficient moisture at the root zone
- Available nutrients for healthy root, stem and leaf growth
- Frequent mowing
In Texas it may require an inch of supplemental irrigation in mid summer. This is best applied prior to 10 AM and at during one application. Soil tests will provide analysis of available plant nutrients. Follow their recommendations to provide adequate nutrients in the soil. Mow often enough to remove approximately 1/3 of the grass blades/leaves height with each mowing.
Following these basic suggestions should produce a desirable weed free lawn in ... time. This doesn’t occur overnight. And, each grass type has specific light requirements. Bermuda grass for example will not do well in shady locations no matter the cultural activities provided. Without sufficient light it will thin out and terminate. Thin lawns are open opportunities for weeds to become establish.
Remember, it’s a subjective choice as to what a lawn should be or appear. Some folks, myself included don’t worry with lawn weeds. Weed free lawns are possible, the choice to develop and maintain them is an individual choice.
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June, 2007 -QA1125A
Q.
Leave Turning Yellow - Leaves on some of my plants are turning yellow while others are shriveling and some are rotting off at the ground. Is all the rain causing this or something else and what can be done? Thanks. – D. S.
A. Yes, all you have described could be caused by the liquid sunshine we have been receiving state-wide this year. And, I’m not complaining.
Here’s the deal. If plant roots do not receive sufficient oxygen this difficulty is expressed in the leaves. They may look as if there is not enough soil moisture even though the soil is saturated with moisture. Herbaceous or non woody plants such as annual color or vegetables may do as you have described, rot off at ground level. They too my just have yellow, wilted or even drop leaves and not rot off at the soil line.
What to do? Wait for July and August to dry out the soil in our “blast furnace” heat. Some other cultural activities that will help to increase evaporation and aeration, Physically pull your mulch back from the root system and punch holes into the soil. Exposing the soil aids in evaporation and holes in the soil aids in oxygen reaching the root systems. A simple digging/turning will work for this operation.
No fertilizers, “whiffle dust” or any magic other aid is needed here.
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June 2007 - QA1125B
Q. Office Plant - I want to put a plant that’s easy to care for in my office that doesn’t have much light. What do you recommend? – G. K.
A. Two of the very best low light house plan families are Spathiphyllums and Aglaonemas. Spaths are also known as Closet Plant and Peace Lily. There are several varieties and therefore various mature heights and widths. Their blooms are white. Yes, a house/tropical plant that will bloom in low light is true!
Aglaonems is also known as Chinese evergreen. These beauties are grow for their foliage. Various varieties have color, width and height differences in foliage and stems.
I utilize one of each in my office and they have not seen any sunlight in four years. Give one or both a try because I believe you will enjoy them.
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June 2007 - QA1125C
Q. Containers for Deck - We would like to plant a couple of large containers of color for our sunny deck and would like to know what you recommend. Thank you. – P. S.
A. I recommend 18” and up diamenenter containers for this application They may be unglazed terracotta, ceramic, plastic, wood or any other multiple season lasting material as long as they drain well. My containers are 20 – 24” in diamenter and sometimes I’d like some larger for banana trees.
Some plants that do well in TX sun during the summer in containers include: lantana, annual vinca, copper plant, vip or bush petunia, tropical hibiscus, mandevilla, cypress vine, sun coleus, gomphrena or bachelor buttons and various salvias.
Use premium/professional lightweight potting soil in the containers. Fill to within an inch of the pot’s rim and firm wit your palm. Install your selections and make sure the tips of their root balls are at soil level, firm soil around each plant and water thoroughly.
After watering is complete you may add a favorite organic mulch to the container’s top edge. Mulch in containers similar to landscape beds aid in creating a favorable root environment and conserving water.
Check moisture needs with your finger and irrigate as needed. And … enjoy!
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June 2007 - QA1125D
Q. Fall Tomatoes - When should tomatoes be planted for a fall crop? – H. L.
A. Usually in TX, the end of June or July 4th are ideal dates to shoot for when planting these tasty items. Some of the best varieties for TX include ‘Celebrity’, ‘Carnival’, ‘444’ and ‘Porter’. These varieties also do well in spring gardens.
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July 2007 - QA1126A
Q. Crepe Myrtle Propagation - We live in the Clermont area of Florida. We have about 10 Crepe Myrtles in our yard that our relatives planted and I want to plant more of them along my fence. Can I just take a clipping and put it into water to root it? My neighbor has purple ones and I would like to do the same with the ones from her? Please help me out here I am not sure as to how to start the new plants. Thank you for your time and help. – D. C.
A. Crape myrtles may be propagated and grown true to their parent form utilizing two methods of cuttings.
- Leafy cuttings taken from current season growth
- Hardwood cuttings taken from dormant plants
Leafy cuttings should be approximately six inches in length and 1/8 inch in diameter. Make the bottom cuts just below a node at 45 degrees. Nodes are the areas where leaves are attached. After cuttings are made remove one or more sets of leaves from the bottom up leaving approximately 4 inches leafless.
Plastic containers filled with lightweight professional potting soil and firmed with palm insert cuttings and firm media around each cutting. Space the selections approximately 2 inches apart in the container. After your container is filled with cuttings water thoroughly.
Raid your closet for two all wire hangers we all typically receive from laundry/cleaner firms coast to coast. Untwist them and bend in a bow form. Insert each approximately 4 inches into the media at the container’s edge 90 degrees apart to construct a structure to suspend clear plastic. Go back to the closet and secure a selection of clear plastic from your cleaner/laundry and cover the structure.
Maintain moist soil. In approximately six weeks check for rooting. When cuttings are well rooted, remove and place into one gal. containers filled with potting soil. Grow for approximately one year then install in the landscape.
Never root any crape myrtle cuttings in water.
Dormant cuttings may be taken anytime during the dormant season. These cuttings should be 1/1 to ¼ inch in diameter and 8 to 10 inches long. Bottom cuts should be as per leafy cuttings, below nodes and at 45 degrees. The top cut should be straight.
These cuttings should be inserted with 2 inches of height above the ground/potting soil. If you have a well-amended soil in a garden spot hardwood cuttings may be planted directly in this location.
Hardwood cuttings should remain in their initial locations for approximately one year. Repotting or locating rooted hardwood cuttings to planting locations should be done during the dormant season following initial removal from parent plants.
These two methods are used successfully for crape myrtles from Florida to California. Good luck on your project.
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July 2007 - QA1126B
Q. Oleanders - Hi there. We have about 30 acres just outside of Crockett. Most of it Is covered in pine and other trees, but about 5 acres was cleared before we bought it. We would like to plant oleanders as a front hedge but were afraid we might purchase the wrong kind. Can you advise which are best for that area? Thanks! – J. and A.R.
A. You are in a beautiful area of Texas. What I suggest you ask for wherever you shop for oleanders is ‘hardy’ red, pink or white. Hardy red tends to be the most winter hardy.
It would be super if we could all grow the beautiful pastel colors found in the landscape along our coast, however most will terminate due to our winter temperatures. ‘Hardy Red’ and ‘Hardy Pink’ have done well as far north as Dallas County.
All varieties of oleanders will handle Texas sun and are WaterWise however only a few will varieties are relatively reliable beyond USDA plant hardiness zone 9 which includes out Texas Gulf coast and Rio Grande Valley.
A reminder here please. Remember, all parts of oleanders are toxic to humans.
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July 2007 - QA1127A
Q. Pruning Fig Trees - Our figs have grown so large it is very difficult to harvest them. I have cut it back to a manageable height. Is this the correct route and do you have other recommendations for figs? Thanks. – E. L.
A. Pruning Fig Trees - It sounds as if you have done well. I communicated with Larry Stein, PhD, Professor and Extension Horticulturist, Texas Cooperative Extension, Texas A & M University System regarding your query. Larry is a world-class fruits, nuts and berry horticultural specialist.
When figs become to large remove the larger older trunks back to a manageable height. Figs should be considered “bushes” and not trees. While the shortage of water is not a problem lately during dry periods fruit development is enhanced when sufficient soil moisture is maintained.
Selecting best locally recommended varieties and planting in full sun locations are the two most important factors in long term success with figs.
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July 2007 - QA1127B
Q. Web Worms - A recent article I read stated that the fall webworms would not cause any harm to the plants. Our neighbor has 2 fruitless mulberry trees that are filled with webworms every year. I have lost viburnums, abelias, azaleas, gardenias, Texas sage and Indian hawthorns all to these little critters. They are now trying to destroy my Bradford pear. They are killing my neighbor’s crepe myrtle and cypress tree. We have sprayed in two-week intervals with BT worm killer and are still fighting them. They are eating my begonias. Is there a difference in fall webworms and pecan webworms? My neighbor will not spray his trees or prune the infested branches from his tree. They are spreading to a sweet gum tree and apple tree. Any comments or suggestions would be appreciated. Thank you. –S. H.
A. Webworms(actually caterpillars) are webworms no matter where they are located. Control of these guests is achieved when aids are successfully applied to each caterpillar. Recommended products are not effective if they do not reach the target. It is not unusual for homeowners to have difficulty in penetrating their webs, which act as a “tent” and protects their homes.
While established trees may look less than attractive with webworms munching on their foliage, unless there are other factors they will put out new foliage after these unwanted visitors are gone. This is usually true of established shrubs also.
If you are not achieving the desired control it may be time to seek a professional. Regarding your neighbor’s decision to not affect any controls, it’s a subjective choice and their decision.
You may wish to visit http://citybugs.com for additional information on fall webworms.
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July 2007 - QA1127C
Q. Roses Disease - I’m having difficulty with diseases on my roses this year and would like to know what you recommend. Thanks. – G. K
A. Apply control aids weekly according to label directions or plant EARTH-KIND™ Roses and don’t worry about diseases on roses. Plant EARTH-KIND™ Rose selections in full sun locations where the soil drains well and good air movement is available and enjoy these WaterWise beauties.
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July 2007 - QA1127D
Q. Vitex - I saw a shrub recently with blue spike flowers. What is it and will it grow around Waco? – H. K
A. The plant in question sounds like Vitex. This is a native large shrub/small tree that grows well in central Texas locations. It also grows from the Dallas/Ft Worth area throughout south Texas in full sun locations with well-drained soils.
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July 2007 QA1128A
Q. Peach Tree Dying - We have a Alberta Freestone peach tree that's dying. This tree is five or six years old, gave us a really plentiful crop this year and now is totally loosing (lost most of them) it's leaves. It sets at the corner of what used to be our garden, so the garden area is (was, we're in the process of trying to level it) lower, so the edge of the tree stands next to where lots of water has set. Could the roots have been water destroyed? Is there hope for it's return, or should we dig it up/cut it down? PLEASE help me, as we need your help immediately. Thank you. - B. P.
A. It sounds as if your tree is suffering from the lack of oxygen in the soil due to less than desirable root zone conditions. Peach trees need good soil drainage and may terminate if not provided. Wet and poorly drained soil conditions for prolonged periods will lead to termination.
There is no way to provide a definity answer on the viability of your tree in question. You may wish to take a wait and see approach.
Note. Are you sure the peach is 'Alberta'? Remember, the name/term ‘Alberta’ does not equal freestone. ‘Alberta’ is but one variety of freestone peaches. There are many freestone peaches but only one variety of 'Alberta'. If you like the flavor, looks and production season of 'Alberta' the variety 'Red Skin' is a superior variety and is also freestone. My favorite freestone peach is 'Loring', try one you might like it too.
December, January and early February are the best months to plant fruit trees in Texas.
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July 2007 QA1128B
Q. Buckeye Tree - I am a new transplant to Texas, and am confused by the native buckeye trees in my yard. One of the trees is over 30 years old, age of other tree unknown. They both have what appears to be a 'ground plate' that they are growing from. Last year, and again this year, they are sending up many little trees around the edges of the ground plate. My question: what is going on with the trees? is this normal? should the little trees be cut off, as we have been doing? Love the trees, they have a wonderful pink cloud of blossoms in the spring. Thank you in advance for your information. - B. A. R.
A. Trees, shrubs and other plants have the ability to initiate new growth including shoots, sprouts and suckers from roots, and stems. These "stems" in the case of trees and large shrubs such as crape myrtles also include their trunks.
Seedlings may also sprout freely under the canopy of trees including Chinese pistachio, oaks and elms.
I'm not familiar with your terminology of 'ground plate', if this means at the soil or ground line then we are in business. Shoots, sprouts and/or seedlings may be cut off at or below the ground line if desired. If they are not controlled the "tree" may with time begin to look more like a large shrub or multi-trunk tree.
The prolonged period of rain and mild temperatures may have set up conditions for a relatively large quantity of seeds to germinate this season than in 2006 and 2005 or other less than desirable growing seasons. This year we have a great crop of Chinese pistachio seedlings in our home landscape and this had not occurred in the past ten years. Seedlings may also be pulled out of the ground if not deeply rooted and a grip is maintained. Some folks actually utilize a type of pliers to accomplish this activity.
July 2007 QA1128c
Dale’s notes:
* Due to our rainy season this year our plants may not have deeply developed root systems. This is especially true for annual color, vegetables and annual herbs. This condition may also apply to some traditional perennial plantings. As a result pay close attention to watering needs throughout the remaining summer. Irrigate only when needed and throughly with each application.
* If you have not done so, now is a prudent time to check mulch around all landscape plantings. Apply sufficient organic mulches including shredded tree trimmings or bark to obtain a depth of 3-4".
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