L Vijaykumar, Anusha SB, Ashwini SB and Divya B

A field experiments was carried out at Zonal Agricultural Research Station (ZARS), Visveswaraya Canal Farm, Mandya, Karnataka to evaluate the bio-efficacy of Beauveria bassiana 1.15WP against gram pod borer, Helicoverpa armigera on chickpea. In all three sprays, ten days after the treatment, a significant and lower larval population was recorded in B. bassiana 1.15% WP @ 3000g/ha and B. bassiana 1.15% WP @ 2500g/ha which recorded larval population of 2.33 and 2.66/10 plants with 80.75 and 78.03 percent reduction in larval population over untreated control and were on par with each other. The next best treatments were B. bassiana 1.15% WP @ 2000g/ha and commercial neem formulation @ 5000 ml/ha and quinalphos 25 EC@1000ml/ha which recorded mean larval population of 3.33, 3.99 and 4.33 per 10 plants with 72.50, 67.05 and 64.24 per cent larval population reduction over untreated control, respectively. However, significantly higher larval population was recorded in untreated control (12.11 larvae/10plants) and this was followed by B. bassiana 1.15% WP @ 1500g/ha (10.33 larvae/ 10plants). Likewise, the higher yield was recorded in B. bassiana 1.15% WP @ 3000g/ha and B. bassiana 1.15% WP @ 2500g/ha and these treatments were also registered significant lower pod damage of 8.11 and 8.36 per cent, followed by commercial neem formulation @ 5000 ml/ha (9.87%) with 73.65, 72.83 and 67.93 per cent reduction in pod damage over untreated control, and were on par with each other compared to untreated control which recorded significantly higher pod damage (30.78%). Among the treatments there was no adverse effect of B. bassiana on the prevailing population of wasps and other natural enemies except in quinalphos 25EC @ 2.5ml/l.

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