S. K. Bhalkare ¹, N. R. Supare ¹, S. A. Nimbalkar ¹, S. V. Sarode ¹

Affiliations
1 Department of Entomology, Post Graduate Institute, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola 444 104, Maharashtra, IN

Abstract

A field experiment was conducted on the farm of Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola to evaluate suitable cost effective combinations of microbial insecticides, plant product and reduced dose of insecticide in an integrated manner for management of Helicoverpa armigera (Hubner) on chickpea, Pooled data on per cent larval reduction after second spray revealed significant superiority of HaNPV alternated with endosulfan (0.07%) at fifteen days after spraying (92.61) and mixed spray of HaNPV with half the recommended dose of endosulfan (88.16), Higher grain yield of 18.47 q/ha and 17.97 q/ha, repectively was also recorded in the same treatments, found on par with each other. In case of pod damage, combination treatment of HaNPV with half the recommended dose of endosulfan recorded minimum pod damage (6.40%). However, HaNPV alternated with endosulfan (0.07%) recorded economic returns of 1:10.14, Thus there is a possibility of alternating HaNPV with chemical insecticides for the effective management of pod borer in chickpea.

Keywords

Bacillus thuringiensis, Endosulfan, Grain Yield, HaNPV, Incremental Cost-Benefit, Ratio, Neem Seed Extract.

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Indira Bhojne ¹, N. R. Supare ¹, N. G. V. Rao ¹

Affiliations
1 Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola 441 004, Maharashtra, IN

Abstract

Comparative studies on the efficacy of Bacillus thuringiellsis Berliner var. kurstaki(HD-I) and morrisoni (HD-12), when used alone against second instar larvae of Helicoverpa armigera (Hubner) revealed that the strain kurstaki(HD-l) was more toxic than morrisoni (HD-12). Strain kurstaki (HD-I) could cause 79.38 per cent mortality of second instar larvae of H. armigera at 0.00963 per cent concentration, while morrisoni (HD-12) could cause 89.66 per cent mortality at 0.0576 per cent concentration. The LC₅₀ was 0.0055, whereas that of HD-12 was 0.02%.

Keywords

Bacillus thuringiensis Var, kurstaki, Morrisoni, Helicovejpa armigera.

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