Vol. 6, Issue 1 (2018)
Evaluation of persistent toxicity of emamectin benzoate 5 SG to Helicoverpa armigera (Hubner) on cotton and Earias vittella (Fabricius) on okra
Author(s): P Karthik, K Ramya, T Thiruveni, K Indirakumar, VM Srinivasan and S Kuttalam
Abstract: A lab experiment was conducted at Tamil Nadu Agricultural University in CRD and replicated thrice to study the persistence of emamectin benzoate in potted cotton and okra plant under glass house condition. The persistent toxicity tests with emamectin benzoate 5 SG (15 g a.i. ha-1) recorded complete mortality of third instar larvae of Helicoverpa armigera on cotton and was observed up to 7 DAT, while it was single day for spinosad treated plants. More than 50 percent mortality was observed up to 11 DAT in emamectin benzoate 15 g a.i. ha-1 treatment, followed by emamectin benzoate 5 SG at 11 g a.i. ha-1 (42.6 percent), Proclaim® (40.1 percent) and spinosad (30.3 percent). Persistent toxicity of emamectin benzoate 5 SG at 11 g a.i. ha-1 was observed complete mortality of Earias vittella larvae up to 7 DAT indicating no change in the persistent period. However, there was significant variation in mortality at various levels of emamectin benzoate at 8.5 g a.i. ha-1 (15 days) and 11 g a.i. ha-1 (17 days). In the effective dose of emamectin benzoate at 8.5 g a.i. ha-1, mortality was observed up to 15 DAT, with cent percent mortality only up to 5 DAT. The order of relative efficacy (ORE) of the insecticides based on the persistent toxicity index (PTI) values was emamectin benzoate 5 SG at 15 g a.i. ha-1 >emamectin benzoate at 11 g a.i. ha-1 >Proclaim®>emamectin benzoate at 9 g a.i. ha-1 >emamectin benzoate at 7 g a.i. ha-1 >spinosad.
Pages: 190-193 | 1409 Views 85 Downloads
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How to cite this article:
P Karthik, K Ramya, T Thiruveni, K Indirakumar, VM Srinivasan, S Kuttalam. Evaluation of persistent toxicity of emamectin benzoate 5 SG to Helicoverpa armigera (Hubner) on cotton and Earias vittella (Fabricius) on okra. Int J Chem Stud 2018;6(1):190-193.
