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How to Control Webworms High in a Tree
How to Control Webworms High in a Tree. Webworms are defoliating pests that also go by the name “fall webworms.” This pest attacks deciduous trees and shrubs by producing large webs that hold egg sacs and larvae during the fall. An infestation of webworms causes damage and defoliation to branches, but it's rarely fatal to the tree when...
Webworms are defoliating pests that also go by the name "fall webworms." This pest attacks deciduous trees and shrubs by producing large webs that hold egg sacs and larvae during the fall. An infestation of webworms causes damage and defoliation to branches, but it's rarely fatal to the tree when removed from all branches promptly. Webworms are unsightly and may stress the tree it they attack it for multiple years.
Things You'll Need
Long-handled broom
Pressure washer
Garbage bag
Systemic insecticide
Brush high branches with the bristle end of a broom to remove as many as possible. Pull the web, larvae and eggs from the broom and throw in a plastic garbage bag.
Spray branches you cannot reach with a sharp stream of water from a pressure washer. A garden hose may not have enough force to remove the web and larvae effectively from the tree.
Gather webs that fall to the ground and throw them into the plastic garbage bag to destroy. Larvae or eggs that fall to the ground will most likely become prey to wasps or other predators.
Apply a systemic insecticide to the soil around the tree if you are unable to reach the webs high in the branches. Follow the package instructions for an application rate based on the size of tree.
