Vol. 3 No. 1
Relative toxicity of some chemicals to Bihar Hairy Caterpillar, Spilarctia obliqua (Walker) (Arctiidae, Lepidoptera).
Author(s): N. NAIR, K. SEKH, M. DEBNATH, S. CHAKRABORTY, A. K. SOMCHOUDHURY
Abstract: The relative toxicity of six insecticides to third instar larvae of Spilarctia obliqua (Wlk) was studied in the laboratory condition. On the basis of LC50 values (% ai), the descending order of toxicity was: emamectin benzoate 5 SG (0.00005), cypermethrin 10 AF (0.00013), indoxacarb 14.5 SC (0.00053), endosulfan 35 EC (0.00323), fenvalerate 20 EC (0.00340) and fenpropathrin 30 EC (0.00513). Considering the LC50 value of fenpropathrin 30 EC as unity (being least toxic), fenvalerate 20 EC, endosulfan 35 EC, indoxacarb 14.5 SC, cypermethrin 10 AF and emamectin benzoate 5 SG were 1.51, 1.59, 9.68, 39.46 and 102.6 times, respectively, more toxic than fenpropathrin 30 EC.
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