Study of Resistance to Insecticides in Macrosiphum avenae F. in Sichuan Province

Insecticide resistance of Macrosiphum avenae was monitored in Sichuan province among 1988～1999. The results showed that high level of resistance to dimethoate and omethoate was developed in M. avenae in Sichuan. The resistance ratios to dimethoate were 692.7-fold and 872.7-fold in Chengdu population in 1989 and Renshou population in 1990,respectively, and to omethoate were 390.9- fold and 388.7 fold in Renshou population in 1994 and Pujiang population in 1999, respectively. Resistance to fenvalerate and deltamethrin also reached a relative high level in the pest in Sichuan province. So far,M. avenae is very susceptible to imidacroprid and pirimicarb. According to our monitoring results, we also discussed strategy to manage insecticide resistance in the pest in our province.