How to Manage Pests
UC Pest Management Guidelines
False Chinch Bug
Scientific Name: Nysius raphanus
(Reviewed 12/09, updated 12/09, pesticides updated 5/16)
In this Guideline:
Description of the Pest
The false chinch bug is a small, light or dark gray species, 0.12 to 0.16 inch long. The nymphs are pale gray with a reddish brown abdomen that matches the color of dry weeds and soil. This species normally breeds and feeds in native grasslands where it multiplies in countless numbers.
False chinch bugs attack crop plants when mass ground migration begins in late spring as foothills and grassy weed areas dry. Migration occurs during cool parts of day.
Monitor areas adjacent to the field and treat migrating populations before they enter into the crop, if possible. Some control can be achieved by burning over or cultivating the adjoining grasslands and pastures. Frequent cultivation of the infested areas when the nymphs are swarming over the ground, as well as flooding or otherwise thorough irrigation are optional practices. Otherwise, treat field borders to stop further field migration and damage. Complete crop treatment is usually not necessary if potential problems are detected early.
UC IPM Pest Management Guidelines: Cucurbits
Insects and Mites
E. T. Natwick, UC Cooperative Extension, Imperial County
Acknowledgment for contributions to Insects and Mites:R. L. Coviello, UC Cooperative Extension, Fresno County
C. B. Fouche, UC Cooperative Extension, San Joaquin County
L. D. Godfrey, Entomology, UC Davis
J. B. LeBoeuf, AgiData Sensing, Inc., Fresno
M. Murray, UC Cooperative Extension, Colusa and Glenn counties
C. G. Summers, Entomology, UC Davis and Kearney Agricultural Center, Parlier