Toxicity of four different insecticides against Trilocha varians (Bombycidae: Lepidoptera)

Abstract

Ficus benjamina is an important ornamental plant in many countries of the world. Recently, this plant is attacked by a lepidopteran insect pest known as Trilocha varians (Bombucidae: Lepidoptera) in Pakistan. This pest eats the leaves making the plant unaesthetic. In the current study, toxicity of four insecticides (deltamethrin, chlorantraniliprole, fipronil and emamectin benzoate) was evaluated against T. varians. Different concentrations of these insecticides were prepared in distilled water and 3rd instar larvae were exposed using leaf dip bioassay method. The results showed that deltamethrin was more toxic to T. varians followed by emamectin benzoate, fipronil, and chlorantraniliprole. The LC50 of deltamethrin after 12, 24, 36, 48, and 60 h were 18.04, 16.67, 5.74, 2.46, and 1.79 ppm respectively. The results will be useful for management of T. varians. Keywords: Chlorantraniliprole, Deltamethrin, Fipronil, Ficus, Ornamental plant