Abstract:
This research was conducted to evaluate the susceptibility of Plutella xylostellalarvae from three
locations in West Java to five non-classical insecticides, i.e. abamectin, chlorfenapyr, emamectin
benzoate, metaflumizone, and spinetoram. The insecticides were tested against second-instar
larvae P. xylostella with a leaf-dip feeding method with a 96-h feeding treatment. The number of
dead larvae was counted at 96 h after treatmentand larval mortality data was analyzed with the
probit method. Based on insecticide LC95,P. xylostella from Cipanas, Cianjur was the least
susceptible to all five insecticides followed by that from Pacet, Cianjur and Cisarua, Bogor. P.
xylostella from Cipanas, Cianjur was not susceptible to abamectin and chlorfenapyr but that from
the other two locations was still susceptible. LC95 of emamectin benzoate against P. xylostella
from the three locations was 0.08 to 2.94 times and thatof spinetoram was 0.02 to 0.12 times as
high as their respective recommended field rates whereas that of metaflumizone was 5.2- to 22.2-
fold higher than its field rate.Thus, P. xylostella from the three locations were still susceptible to
emamectin benzoate and spinetoram but were not susceptible to metaflumizone. The insecticides
that are still effective against P. xylostella, when needed,should be used in the context of
integrated pest management |
