Controlling Caterpillars on Weeping Cherry Trees

A homeowner battles caterpillars every year on one of two weeping cherry trees, losing leaves and flowers. They want to know when and how to treat.

Treatment Options

1. Foliar spray: Apply Orthene (acephate) to the entire canopy when caterpillars are actively feeding. This systemic insecticide is absorbed by leaves and kills feeding larvae. Practical only on smaller trees.
2. Soil-applied systemic: Use Bayer Advanced Tree & Shrub Insect Control (imidacloprid) as a soil drench around the base. Roots transport it to foliage, providing season-long control. Suitable for larger trees where spraying is difficult. Do not use on fruit-bearing trees if fruit will be consumed.

Apply in early spring as leaves expand and caterpillars hatch. Always follow label directions.