Field Control Effect and Safety Evaluation of Six Kinds of Pesticides against Plutella xylostella

LU Yun; WANG Hongjun; JIA Liyuan; WANG Chunhua

doi:10.15933/j.cnki.1004-3268.2017.07.013

Abstract：In order to select pesticides of high efficiency,low toxicity and safety to control Plutella xylostella,indoor toxicity test,field trial and safety evaluation were conducted successively on 6 kinds of pesticides.The results of indoor toxicity test showed that the virulence of 20％ Chlorantraniliprole suspension was the strongest after 72 h,of which 50％ lethal concentration(LCs0) was 0.584 2 mg/L.10％ Si Ltü Chong Xian'an suspension (SYP-9080) and 10％ Chlorfenapyr suspension were next,and their LC50 were 0.792 3 mg/L and 1.621 3 mg/L respectively.1％ Emamectin benzoate emulsifiable concentrate(EC) had the weakest virulence,of which the LC50 was 3.508 2 mg/L.The experiment in the field showed that 20％ Chlorantraniliprole suspension was the best in all treatments.Its control effect reached 84.4％ one day after applied,and 96.2％ after seven days.Compared with the other pesticides,20％ Chlorantraniliprole suspension was superior,characterized by quick onset,low residues,long duration and safety.SYP-9080 and 10％ Chlorfenapyr suspension were followed.Their control effects reached 77.8％ and 71.2％ respectively one day after applied,then 87.3％ and 87.9％ respectively after seven days.20％ Emamectin benzoate hydrazide EC and 5％ Fipronil suspension were next,whose control effects reached 65.1％ and 64.3％ respectively one day after applied,and 77.1％ and 75.0％ after seven days.1％ Emamectin benzoate EC was the worst.Its control effect was only 56.3％ one day after applied,and dropped to 42.5％ after seven days.During the test period,all the pesticides were safe to crop.So it is believed that 20％ Chlorantraniliprole suspension,SYP-9080,10％ Chlorfenapyr suspension,20％ Emamectin benzoate hydrazide EC and 5％ Fipronil suspension are all suitable for widely use in pollution-free vegetable production bases.