Frequently Asked Questions About Insects - Department of Entomology at Texas A&M University

Frequently Asked Questions

Topic:	Caterpillars, on hibiscus
Question:	I have a lot of black worms (caterpillars) on my hibiscus plants. Is there a home remedy to get rid of them? Someone recommended Dawn soap diluted with water and sprayed on the flowers. Will that hurt them? I have a lot of hibiscus.
Answer:	I cannot identify the "black worms" without seeing a specimen or more information. I cannot recommend home remedies because they are not tested for safety. Some of the mixtures may be more toxic to humans than many of the pesticide products. At least we know something about the toxicity of pesticide products. Also home remedies are not consistent in their production, so their effectiveness is not reliable. I would recommend products with Bacillus thuringiensis as the active ingredient. They are sold as Dipel, Thuricide, and many other trade names. This is specific for caterpillars and has a low toxicity to humans. The next choice would be carbaryl (Sevin) which is also considered quite safe. Be sure to read the directions on the product label and follow them. Pesticide products have been tested for safety when used according to the product label.
Related Link:	http://insects.tamu.edu/fieldguide/cimg318.html
Related Link:
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Response by:	John A. Jackman, Ph.D.
Title:	Professor and Extension Specialist
** Most of the Related Links above also contain images.