Title: Newer Synthetic and Biorational Insecticides against Aphid, Rhopalosiphum maidis (Fitch) on Plantago ovata Forsk.
Abstract: The relative efficacy of eleven insecticides against the aphid, Rhopalosiphum maidis (Fitch) revealed that dimethoate emulsion (0.03%) was the most effective followed by imidacloprid (0.005% solution), thiamethoxam (0.025% dispersion) and acephate (0.037% solution). Vertimec (9.5 mg a.i. L−1 emulsion), spinosad (0.01% suspension) and diflubenzuron (0.05% emulsion) ranked in the middle order of effectiveness. Metarrhizium anisopliae (1×108 spores L−1), Beauveria bassiana (1 ×108 spores L−1), karanj seed extract (5 mL L−1), and neem seed kernel extract (5 mL L−1) were the least effective. The maximum yield was recorded from the plots treated with dimethoate (7.79 q ha−1) followed by imidacloprid and thiamethoxam and the minimum from M. Anisopliae (5.37 q ha−1). The highest benefit:cost ratio (39.51:1) was obtained in dimethoate treatment followed by acephate (36.92:1) and imidacloprid (24.84:1). Plots treated with spinosad showed negative benefit:cost ratio (0.28:1).
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 2
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