The experimental insecticide fipronil would be a valuable supplement for existing insecticides currently recommended for cotton pest management. Fipronil has excellent activity on piercing and sucking arthropods and selected Coleopterans and may provide enhanced control of such pests as the thrips complex, Frankliniella spp., tarnished plant bugs, Lygus lineolaris (Palisot de Beauvois), and boll weevil, Anthonomus grandis Boheman. This new insecticide which is classified as a phenyl pyrazole represents a new class of insecticides with a unique mode of action. In several European countries and South America, fipronil has been tested as a foliar spray, soil applied insecticide, seed treatment and bait (5). Insecticidal activity occurs through contact and ingestion (8).

These data represent summary analysis of fipronil formulated as EXP60145A SC, EXP60434A 80 WDG and EXP60720A. The summary tables include tests conducted from 1989-1993. The first test (1989) was a thrips foliar test, sampled by washing procedures developed to evaluate seedling pests (3). Since 1989 several efficacy tests evaluating activity against thrips, aphids, plant bugs and boll weevils were conducted on selected research stations in the Mid-South. Results from most of these tests are included in this report. Topical application (ESA standard procedure for measuring resistance) data for boll weevil are presented as well as spray table data for tarnished plant bug efficacy.