Laboratory effectiveness of some insecticides and Piper aduncum fruit extract against diamondback moth (Plutella xylostella [L.]) from Cisarua-Bogor and Pangalengan-Bandung, West Java, Indonesia

This work was done to evaluate the laboratory effectiveness of 5 commercial insecticides, i.e. abamectin, chlorantraniliprole, chlorfenapyr, methomyl, and spinetoram, against diamondback moth (DBM), Plutella xylostella, from Cisarua District, Bogor Regency and Pangalengan District, Bandung Regency, West Java, Indonesia. Emamectin benzoate and Piper aduncum (Piperaceae) fruit extract were also tested against P. xylostella from Cisarua, Bogor. The results of feeding of DBM larvae with treated broccoli leaves showed that chlorfenapyr, emamectin benzoate, and spinetoram were still effective against DBM from Cisarua (their LC₉₅ were lower than their respective recommended field rates). Spinetoram was also still effective but chlorfenapyr was rather ineffective against DBM from Pangalengan. Abamectin was rather effective (LC₉₅ was 1.8- and 1.5 times as high as its field rate) but methomyl was not effective against the 2 populations (LC₉₅ was more than 4-fold higher than its field rate). Meanwhile, chlorantraniliprole was rather ineffective against DBM from Pangalengan and was not effective against the Cisarua population (LC₉₅ was about 3.6-fold and 8.3-fold higher than its field rate, respectively). Furthermore, LC₉₅ of P. aduncum extract at 96 h after treatment was 0.47% (w/v) (< 0.5%) suggesting that this botanical insecticide is potential to be used as an alternative means for controlling DBM.