The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by NC State University or N.C. Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. These insecticides are available in the garden sections of big box stores, nurseries, and other plant centers The cocoons will at least partially protect the caterpillars or pupae inside. It would be well to watch for these caterpillars next year as some of them may survive the winter away from the area being sprayed. For larger caterpillars, it might be better to use a pyrethroid insecticide such as permethrin, bifenthrin, and lambda cyhalothrin because pyrethroids are generally very toxic to caterpillars and they have long-lasting residues. Younger caterpillars are generally more susceptible to pesticides including insecticidal soaps, horticultural oils, Bacillus thuringiensis insecticides, and neem seed extract insecticides. However, when the worms are fully grown, they may be somewhat resistant to pesticides because they are no longer feeding and are getting ready to spin their cocoons. Genista caterpillars are probably not resistant to insecticides. Residential Recommendations Skip to Residential Recommendations Genista broom moths have four to five generations per year in North Carolina and the caterpillars are usually most abundant in late summer or early fall. They can become abundant enough to cause extensive defoliation. It overwinters in cocoons on or near the base of its host plants and the moths emerge the following year to mate and lay eggs from which hatch the tiny, hairy caterpillars that soon grown into larger hairy caterpillars. The head is black with white dots as well.
Each black spot has a white dot at tip that sports sparse, long white hairs. Larger caterpillars are brownish-green with raised black spots and bright yellow patches on each segment. The tiny, newly hatched caterpillars are green and blend in on the foliage. Females lay eggs in batches of up to about 70. The hindwings are yellow or orange with some brownish-gray shading toward the edges. The moths are light to medium brown with a dark spot on each top wing. The genista broom moth, Uresiphita reversalis, is also called the genista caterpillar and sophora worm. Description and Biology Skip to Description and Biology
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