LABORATORY TESTS OF PYRETHROID AND ORGANOPHOSPHATE INSECTICIDES ON OXYCARENUS-LAVATERAE (HETEROPTERA, LYGAEIDAE)

The phytophagous bug Oxycarenus lavaterae F. may sometimes cause major public concern because of its breeding in large numbers near towns. T his happened between 1994, and 1996 in Cornella de Llobregat, Baix Llo bregat, northeastern Spain. As information on its susceptibility to pe sticides was scarce, a laboratory susceptibility test was designed. Di fferent dilutions of 3 pyrethroids (beta-cyfluthrin, tralomethrin, and deltamethrin) and 3 organophosphates (acephate, phoxim, and malathion ) were evaluated by means of a direct-spray test. Tralomethrin at 22.7 mg/liter yielded an LT50 of 30.6 min and was considered to be the mos t appropriate product Tor field use.