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VOL. 6, ISSUE 6 (2021)
Studies on influence of different entomopathogens against gram podborer, Helicoverpa armigera (Hubner) on redgram
Authors
Chand Asaf, M Palanisamy, V Sathyaseelan, M Senthil Kumar
Abstract
Bioefficacy of entomopathogens viz., HaNPV, Bacillus thuringiensis, Metarhizium anisopliae, Beauveria bassiana; new generation chemical (Spinosad) and botanical insecticide (NSKE) were evaluated for two seasons during 2018 to 2019 at Annamalainagar, Cuddalore District, Tamilnadu. Pod-dip bioassay studies were carried out in the laboratory and spraying was taken up in the field studies for two seasons. Experimental results indicated that all the treatments had significant effect in minimizing the pest damage ranging from 0.66 to 1.66 larva/five plants after 2 days of second spraying as compared to 1.66 in control. Among all the treatments, Spinosad 45% SC @ 73 a.i/ha was the most effective with minimum population of 0.66 larvae/ha with 60.24 per cent reduction over control, followed by Bacillus thuringiensis @ 1.5 kg/ha and NSKE 5%@ 25kg/ha. The number of larvae of H. armigera at 6 days after second spray revealed that all the treatments were statistically superior and found effective to decrease the H. armigera larval population. The yield obtained from the plots (II season) treated with Spinosad 45% SC @ 73g a.i/ha recorded the highest yield 9.83 q/ha followed by HaNPV @ 250 LE/ha and Bacillus thuringiensis @ 1.5 kg/ha which yielded 9.30 and 9. 06 q/ha.
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Pages:160-162
How to cite this article:
Chand Asaf, M Palanisamy, V Sathyaseelan, M Senthil Kumar "Studies on influence of different entomopathogens against gram podborer, <em>Helicoverpa armigera</em> (Hubner) on redgram ". International Journal of Entomology Research, Vol 6, Issue 6, 2021, Pages 160-162
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