杀铃脲及其混剂对麦田天敌影响的评价

Evaluation of Triflumuron and Triflumuron +Fenvalerate Effecting on Natural Enemies of Wheat Field.

杀铃脲属昆虫几丁质合成抑制剂．它不仅对害虫具有较强的毒杀作用，而且对环境和天敌安全。在用该药进行小麦粘虫防治试验的同时，还做了该药对天敌作用的室内测定和田间调查．明确了杀铃脲单剂不同浓度、不同剂型对麦田瓢虫、蜘蛛等主要天敌无杀伤作用，室内处理后的试虫仍能正常化蛹和羽化。杀蛉脲混剂低剂量对天敌无影响，中剂量有一定影响，高剂量影响严重。

Effects of 'Triflumuron and Triflumuron +Fenvalerate toxicity to naturalenemies in the wheat field were evaluated from 1992～1995 in laboratory and field. The results showed that, (1) 20, 100 and 200mg/hm￣2 20% Triflumuron Suspending agent are safeto 4th instar larvae of ladybird and spider. (2) 250mL, 500mL and 1000mL/hm￣2 Triflumuron 3EC and 150mL, 750mL/hm￣2 Triflumuron 20EC are safe to ladybird and spider(dominant natural enemies in the wheat field). (3) 250mL and 500mL/hm￣2 Triflumuron+fenvalerate 11.5EC,and 150mL/hm￣2 Triflumuron +fenvalerate 20EC have slight toxic tonatural enemys. 1000mL/hm￣2 Triflumuron+fenvalerate 3EC and 750mL/hm￣2 Triflumuron+fenvalerate 20EC have modertate and high toxicity to natural enemies respectively.