Compatibility of Vegetable Oils with Entomopathogenic Fungi against Lesser Grain Borer, Rhyzopertha Dominica (F.) in Paddy


Abstract

Compatibility of entomopathogenic fungi, <i>Beauveria bassiana</i> (2 x 106 conidia/g), <i>Metarhizium anisopliae</i> (1 x 109conidia/g) and <i>Lecanicillium lecanii</i> (2 x 107conidia/g) @ 5 g/kg with vegetable oils (2 ml/kg) viz. sunflower oil and groundnut oil were studied against lesser grain borer, <i>Rhyzopertha dominica</i> in paddy. The highest adult mortality of <i>R. dominica</i> was recorded with <i>Metarhizium</i> + groundnut oil (81.57%) followed by <i>Beauveria</i> + groundnut oil (78.54%) when compared to groundnut oil (65.28%) alone at 15 DAT. Progeny build up recorded at 180 DAT was found to be less with <i>Beauveria</i> + groundnut oil (118.33) followed by <i>Metarhizium</i> + groundnut oil (121.33) when compared to control (517.00) and were superior over all other treatments. Similarly, less per cent weight loss was recorded with <i>Beauveria</i> + groundnut oil (17.59%) followed by <i>Metarhizium</i> + groundnut oil (19.01%) when compared with control (50.09 %) at 180 DAT. High per cent reduction in progeny was recorded with <i>Beauveria</i> + groundnut oil (77.11%) followed by <i>Metarhizium</i> + groundnut oil (76.53%) when compared to control. The next better were recorded with <i>Beauveria<i/> + sunflower oil (73.56%), <i>Lecanicillium</i> + sunflower oil (72.66%) and <i>Metarhizium</i> + sunflower oil (71.37%) when compared to control at 180 DAT. High per cent reduction in weight loss was recorded with <i>Beauveria</i> + groundnut oil (64.88%) followed by <i>Metarhizium</i> + groundnut oil (62.05%). The next better were recorded with <i>Beauveria</i> + sunflower oil (60.03%), <i>Metarhizium</i> + sunflower oil (56.50%), and <i>Lecanicillium</i> + sunflower oil (51.61%) when compared to control at 180 DAT.

Keywords

Beauveria Bassiana, Metarhizium Anisopliae, Lecanicillium Lecanii, Sunflower Oil, Groundnut Oil, Rhyzopertha Dominica

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