Antifeedant Activities of the Methanol Extracts of Stellera chamejasme against Plutella xylostella

摘要

Few studies reported the antifeedant activity of Stellera chamejasme extracts against larvae of Plutella xylostella. Here, laboratory choice and no-choice test feeding studies were conducted to assess the antifeedant activity of methanol extracts of S. chamejasme against larvae of P. xylostella. S. chamejasme Extracts caused severe feeding deterrence by 2nd or 3rd instars larvae of P. xylostella in a concentration-dependent manner, which were observed both in laboratory choice and no choice test feeding studies. Within 24 h, 93.8% feeding deterrence were achieved in 2nd or 3rd instars larvae of P. xylostella using Stellera chamejasme extracts in choice test, while 86.5 % got in no-choice test. In choice test, the AFC50 values (24 h) by 2nd or 3rd instars larvae were 41.6 mg/L for the extracts of S. chamejasme, while 569.3 mg/L got in no-choice test. S. chamejasme may be a potential source of antifeedants that can be used for P. xylostella control.