Evaluation of indoor efficacy of nine pesticides on desert locust Schistocerca gregaria
To identify effective control agents for different growth stages of the desert locust Schistocer-ca gregaria,a major agricultural pest known for its cross-border migration,the lethal effects of four chemical pesticides (malathion,cypermethrin,chlorpyrifos and deltamethrin),two plant-derived pesti-cides (azadirachtin and natural pyrethrin) and three biological pesticides (Metarhizium anisopliae,Beau-veria bassiana and M. acridum) were evaluated against the 3rd and 5th instar nymphs under indoor con-ditions. The results showed that the corrected mortality rate of the 3rd instar nymphs after five days of treatment with malathion,cypermethrin,chlorpyrifos,deltamethrin and natural pyrethrin were higher than 85.0％,with LT50 values of less than four days. Among these,malathion,chlorpyrifos and cyperme-thrin demonstrated significant indoor lethality against 5th instar nymphs,with corrected mortality rate exceeding 85.0％ after ten days. Compared with the 3rd instar nymphs,the lethal effects of deltamethrin and natural pyrethrin on the 5th instar nymphs were significantly lower,with corrected mortality rates of 26.2％ and 13.8％,respectively,after 25 days. The corrected mortality rates for M. anisopliae,B. bassiana and M. acridum and the plant-derived pesticide azadirachtin on the 3rd instar nymphs were 6.7％-15.6％.The results indicate that malathion,chlorpyrifos and cypermethrin are highly effective control agents for desert locust control,which could be used for emergency prevention and control of desert locusts.
万方数据
维普
