K. D. Bisane ¹, S. L. Borkar ¹, G. K. Lande ¹, S. K. Bhalkare ¹

Affiliations
1 Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, 444104, Maharashtra, IN

Abstract

The parasitization of Helicoverpa arinigera (Hubner) larvae and pupae was studied during 2004-05 and 2005-06 from field collected life stages on pigeonpea. The ichneumonid, Eriborus argenteopilosus was found to be the most effective and active parasitoid of early instar larvae from 45^th Meteorological week (MW) till 51^st MW and recorded the highest parasitization in 46^th MW (25.00 per cent). The other ichneumonid, Campletis chlorideae was observed to be active in December (16.67 per cent). Parasitism by a Braconid, Bracon sp., noticed from 45^th to 47^th MW and 50^th MW, was up to an extent of 7.89 per cent. On pigeonpea, these parasitoids contributed to approximately two-third of the total mortality of early instar H. armigera larvae. Tachinid parasitoids were found to be associated with the late larval instar and pupae. The parasitization of late larval instars was noticed from 47^th MW to 52^nd MW and the population reduction was estimated to be 17.86 per cent, which was highest in 48^th MW. Similarly, HaNPV disease infection also played an important role in population suppression of early and late instar larvae to an extent of 7.69 and 3.57 per cent, respectively. Pupal mortality by a tachinid was noticed from 46^th MW to 52^nd MW in the range of 8.33 to 26.32 per cent.

Keywords

Bracon spp., Campoletis chtorideae, Eriborus argenteopilosus, Helicoverpa armigera, Pigeonpea, Parasitoids.

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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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Amol Waghmare ¹, Niraj S. Satpute ¹, S. K. Bhalkare ¹, P. N. Mane ¹

Affiliations
1 Biocontrol Laboratory, Department of Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola-444 104 (MS), Maharashtra, IN

Abstract

Influence of rearing temperature on biological parameters of Trichogramma chilonis (Ishii) was studied under laboratory conditions during 2017-18. Maximum per cent parasitization and adult emergence of 74.2% and 78.91%, respectively was observed at 25+1°C followed by 71.8% and 65.21 % at 30±1°C. However, the temperature of 40+1°C was found detrimental to T. chilonis recording only 20.2% parasitization, the progeny of which has failed to complete the development and the adults could not emerge out. The developmental period was maximum (8 days) at 25+1°C. Also, maximum male and female longevity (5 and 12 Days, respectively) and maximum mean per day fecundity of 17 eggs per female/day were recorded at 25+1°C. The progeny was found to be male dominated with a female-male ratio of T. chilonis to be 0.69, 0.74 and 0.96 at 25, 30 and 35°C, respectively.

Keywords

Biological Parameters, BOD Incubator, Rearing Temperatures, Trichogramma chilonis

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