Popularization study on the chemical control ofColeophora dahurica flkv. by ULV spraying malathior

Abstract

The control ofColeophora dahurica Flkv. by ULV spraying rare oil of malathior was popularized in Inner Mongolia Daxing’an Mountains in 1992–1993. The control area was 32744.3 hm², which was 98.2% of the suitable control area in Inner Mongolia Daxing’an Mountains and 75% of the suitable area in Inner Mongolia respectively. Dosage was 1125 g/hm². Control effectiveness was above 95%; the larvae density decreased from 52.5 to 0.94 per 50cm sample twig and direct economical benefit was 3,935,420 Chinese yuan.