How to Manage Pests
Active ingredient: Bacillus thuringiensis ssp. kurstaki
Pesticide type: insecticide (microbial)
Synonym: Bacillus thuringiensis
See example products below.
Surfaces where caterpillars feed must be well covered because caterpillars must ingest the bacteria to be affected. Careful timing is essential for success. Apply just after caterpillars begin hatching out of eggs. Small caterpillars are more susceptible than older larvae. Treatment is not effective on eggs, pupae, and adults. The material breaks down rapidly in the environment. Try to avoid making applications when the sun is on the plant. Affected caterpillars will stop feeding within hours, but may not die for 2 to 3 days. Wettable powders that you mix up yourself just prior to application will be most effective. Make up a fresh solution each time you treat. Reapplication will be necessary to kill caterpillars hatching one or more days after an application is made.
Precautions and Safety Equipment
Minimize your exposure to pesticides. Avoid contact with eyes. Wear eye protection, long pants, a long-sleeved shirt, and a hat that can be washed after each use. Always read label of individual product for additional directions.
Garden Safe Brand Bt Worm & Caterpillar Killer