Toxicity of Selected Insecticide against Diamondback Moth Plutella xylostella (L.) under Controlled Condition

Abstract

Plutella xylostella L. commonly known as diamondback moth, is the major pest of crops belonging to family Brassicaceae all over the world. The diamondback moth reduces the economical production of the crucifers, while several insecticide and IPM techniques have been applied for its better management, but it has developed resistance against insecticides. Five insecticides, including Chlorantraniliprole, Lufenuron, Flubendamide, Trichlorphon, and Pyriproxifen, were tested against P. xylostella (DBM) at the 2^nd and 3^rd larval stages to evaluate mortality by using the leaf dip bioassay method after a time interval of 24, 48, and 72 hours. All the insecticides were found toxic to the studied insects; however, mortality was found to be time-dependent. Flubendiamide proved to be more effective with 96.6 percent corrected mortality after 48hrs and LC₅₀ 7.035 µl/ml against P. xylostella immatures, while chlorantraniliprole was found to be the second most effective insecticide. The present study reveals the high potential of insecticides, so these insecticides could be evaluated further under field conditions.