CROSS-RESISTANCE BETWEEN INSECTICIDES IN COFFEE BERRY BORER, HYPOTHENEMUS-HAMPEI (COLEOPTERA, SCOLYTIDAE) FROM NEW-CALEDONIA

The responses of adult females of Hypothenemus hampei (Ferrari) from N ew Caledonia, which were either resistant or susceptible to endosulfan , were compared to a range of insecticides. High levels of cross resis tance were present to organochlorines (aldrin, dieldrin and lindane). No cross resistance was evident to carbaryl or organophosphates (desce nding order of toxicity: fenitrothion > pirimiphos-methyl > chlorpyrif os > diazinon=malathion). Carbaryl, a carbamate, was the least toxic, and avermectin, a macrocyclic lactone, was the most toxic insecticide tested on H. hampei. No evidence of synergy from esterase (DEF) or mic rosomal oxidase (piperonyl butoxide) inhibitors was present.