What Causes Worms in Pecans

The webs that occur in pecan trees are formed by the caterpillar of an insect called the fall webworm. The adult fall webworm is a stout-bodied white moth with a wingspan of about one inch.

How do you keep worms out of pecans?

Homeowners can treat fall webworms with insecticides containing the active ingredient spinosad. Trees that are less than 20 feet tall can be sprayed using a garden hose sprayer attachment or another type of sprayer that can reach the top of the tree. Homeowners with larger trees can choose to get more creative.

Can pecans have worms in them?

Every year the pecans have a small hole with a white worm in them. What can be done to prevent this? A: You have pecan weevils in your pecans. The adult female weevil is a beetle-like insect that emerges from the ground in early August each year.