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Abstract

The study was conducted to determine the effectiveness of application of Bacillus thuringiensis commercial formulation for the control of Helicoverpa armigera Hbn. on highly acidic chickpea plant. Dosage-mortality response of neonate larvae of H. armigera due to feeding on HD-1-S-1980 and malic acid alone or combinations of both incorporated in the artificial diet were assessed. Significant synergistic interactions were observed in most of the combinations of HD-I-S-1980 with malic acid from 1.00-4.00 concentrations.. Slopes of regressions upto 4.00 malic acid HD-I-S-1980 combinations were steeper than HD-I-S-1980 alone . The LC50 of HD-I-S-1980 decreased with 1.0, 2.0, 4.0 malic acid. Potency of HD-I-S-1980 was increased by 0.4, 2.7, and 12.89 folds in 1.0, 2,0, and 4.0 malic acid combinations respectively. The dosage-mortality responses of the noctuid, H. armigera to combination treatments of the US reference standard HD-I-S-1980 with malic acid enhanced the effectiveness of the bacteria. The study can prove to be helpful when applying Bt on chickpea to control lepidopterous pests in field.

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