Managing Webworm Infestations in Mature Fruitless Mulberry Trees

Understanding the Webworm Outbreak

A 45-year-old fruitless mulberry tree in Dallas is experiencing a severe infestation of fall webworms. While the tree has historically tolerated minor yearly outbreaks, this season the webs cover the canopy and caterpillars are dropping onto surrounding surfaces, creating a nuisance for the homeowner and neighbors.

Immediate Control Measures

For rapid knockdown, apply a permethrin-based insecticide spray to the affected areas. Homeowners can treat accessible portions themselves, but given the tree's size and the extent of the infestation, hiring a professional tree care company (approximately $100) or a certified arborist is recommended for thorough coverage.

Long-Term Prevention

To prevent future outbreaks, apply a systemic insecticide in early spring before bud break. This will protect the foliage as it emerges. Additionally, maintaining tree vigor through proper watering and fertilization reduces stress and improves recovery.

Tree Health Assessment

Despite being labeled a "trash tree," this mulberry has survived decades. Defoliation weakens the tree, so prompt action is crucial. The tree will likely recover if leaf loss is halted and supportive care is provided. Consult an ISA-certified arborist for a tailored management plan.