As temperatures rise and the days grow longer, Texans may notice an increase in the appearance of silky, web-like structures draped over tree branches. These are the creations of fall webworms, a type of caterpillar that has sparked a bit of buzz around the city.
Wizzie Brown, an entomologist with the Texas A&M AgriLife Extension, sheds light on these critters and their impact. The fall webworm caterpillar, known for its ability to create intricate webs resembling those of spiders, is the larval stage of a white moth.
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“These caterpillars create webs as soon as they hatch from their eggs,” explains Brown. The purpose of these webs is to protect the caterpillars while they feed on the foliage.
Despite their somewhat alarming appearance, fall webworms are not harmful to humans or pets.
“They’re not going to hurt people or animals or anything like that. And essentially for the trees, they’re just going to chew on the leaves,” Brown explained.
The primary concern with fall webworms is their effect on trees. They chew on the leaves, which can cause some damage, but generally, healthy trees can withstand this defoliation.
The presence of fall webworms can be beneficial in certain aspects. They serve as a food source for various predators, including birds, lizards, and wasps. For those looking to control the webworm population, the recommended method is to open the webs with a stick or a jet of water. This allows natural predators to access and consume the caterpillars, reducing the need for pesticides.
“Essentially, all you need to do is open the webbing, and natural predators will do the rest,” advises Brown.
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While the webbing will remain in the tree until it is either removed by humans or dislodged by weather, the caterpillars themselves will be taken care of by their natural enemies.
For those who might see these webs as a nuisance, Brown assures that with proper management, fall webworms do not pose a significant threat to trees.
“It all depends on how you look at things,” she adds, emphasizing the importance of understanding these insects’ role in the ecosystem.
While the sight of web-covered trees might initially cause concern, understanding the nature and behavior of fall webworms can help Houston residents manage and even appreciate these seasonal visitors. By allowing natural predators to control the population, Texans can maintain the health of their trees and enjoy a balanced ecosystem.
