#27 _ (06-03-19) -  WMJ-3435 webworms on pecan.jpg

Webworms are insect pests that produce a spider-like maze of webs that envelope leaves near the tips of branches. While they prefer mulberry and pecan, webworms will feed on a wide variety of other landscape trees and shrubs.

The last days of June ended with an abundance of rainfall and a few mornings with surprisingly cooler temperatures.

July has arrived and that means the year is about half over and the days are getting shorter. It also means the warm temperatures of summer have set in for sure.

Most of us put our gardens into a holding pattern in July. We just try to keep the bugs and weeds at bay and to keep cool. Here’s your gardening checklist for July.


Check the cutting height of your lawn mower. During the heat of Gulf Coast summers, consider raising the lawn mower blade to a higher setting. The higher the cutting height, the less lawn grass is stressed resulting in a healthier lawn.


Reblooming salvias, such as Salvia greggii and S. farinacea, should be pruned back periodically during the summer. To make the job easier, use hedging shears, and remove only the spent flowers and a few inches of stem below.


Divide spring and early summer perennials including daylilies, iris, etc., and replant the best clumps. Discard the diseased or damaged material and share any surplus with friends.


Crape myrtles are putting on a spectacular flower display this year. After crape myrtles put on their first full bloom, you can stimulate the plants to extend their flowering period by pruning the flower heads as soon as possible after they finish flowering.


Low areas in the lawn may be gradually filled with shallow applications of good topsoil where needed. However, avoid temptation to apply a layer of sand over the entire lawn area just because your neighbor does. This is an excellent way to introduce new weeds, smother your grass and encourage unwanted insects and disease problems.


“Do I have webworms or bagworms on my trees and shrubs?” This has been a frequently asked question over the last few weeks. Webworms are the ones that make the spider-like maze of webs around leaves near the tips of branches, and bagworms are the ones that live inside brown bags that they drag along with them for protection.

Both insect pests can be controlled with organic insecticides such as Dipel, Bio-worm Killer or other organic spray products containing Bacillus thuringiensis. The caterpillars eat it, become sick almost immediately, stop feeding and then die within a few days.

Bagworms can be somewhat difficult to control, especially as caterpillars become larger. Conventional insecticides labeled for bagworm and webworm control include carbaryl, cyfluthrin, malathion and permethrin.


July is the month when many homeowners start reporting the appearance of strange webbing on the trunk and limbs of trees. Several concerned homeowners have already emailed me photos of barklice on tree trunks. The webs are produced by colonies of small insects known as barklice.

The webs may give trunks and limbs the appearance of being “dressed” in a white stocking. Fortunately, barklice (which really aren’t lice) don’t cause any harm to trees. In fact, they are beneficial in that they eat lichens and fungi growing on the bark. No control is needed.


July is the last month for pruning blackberry canes, which promotes secondary shoot growth. Blackberries should be lightly fertilized with a general purpose fertilizer such as 15-5-10 or 21-0-0.

Dr. William Johnson is a horticulturist with the Galveston County Office of Texas AgriLife Extension Service, The Texas A&M System. Visit his website at aggie-horticulture.tamu.edu/galveston.

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