• D R Jadhav

      Articles written in Proceedings – Animal Sciences

    • Mermithid nematodes as parasites ofHeliothis spp. and other crop pests in Andhra Pradesh, India

      V S Bhatnagar C S Pawar D R Jadhav J C Davies

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      Insect pests were collected from cultivated and wild plant species to study their parasites in Andhra Pradesh, India. Besides insects, nematodes emerged as parasites WhileHexamermis spp. were common in most lepidoptera,Ovomermis albicans (Siebold) was recovered fromHeliothis spp. The nematodes were active, even more than insect parasites during early monsoon. They were more active on light-soils than on heavy-soils. AgainstHeliothis armigera (Hubner) in particular, their incidence was more on “low-growing” crops likeArachis hypogaea (L.), andLycopersicon esculentum (L.), and weeds. The nematode Pentatomimermis sp. was recorded from the bugNezara viridula L.

    • Heliothis species and their natural enemies, with their potential for biological control

      C S Pawar V S Bhatnagar D R Jadhav

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      Four egg and 24 larval parasitoids including one mermithid species have been identified fromHeliothis armigera collected at and around ICRISAT Center. Twenty one insect and five spider species have been recorded as predators ofHeliothis. The degree of parasitism varies according to the crop. Egg parasitism is absent on chickpea, and almost negligible on pigeonpea (0·3%). Most early larval parasitism occurs on pearl millet (50·7%), sorghum (49·5%), and chickpea (31·4%), whereas late larval parasitism occurs on pigeonpea (16·4%), and groundnut (11·5%).

      The egg parasitoids, mostlyTrichogramma chilonis Ishii, and the parasitoids of small larvae, mostlyCampoletis chlorideae Uchida, are the most abundant natural enemies ofHeliothis in the study area.

    • Campoletis chlorideae Uchida (Hymenoptera: Ichneumonidae) as a parasite ofHelicoverpa armigera (Hub.) (Lepidoptera: Noctuidae) in southwest India

      C S Pawar V S Bhatnagar D R Jadhav

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      Campoletis chlorideae Uchida was the most common parasite emerging from the larvae ofHelicoverpa armigera (Hub.) collected during 1974–83 from almost all of its crop and weed hosts from Andhra Pradesh, Karnataka and Maharashtra. In most years, parasitism was highest in September and lowest in May. At ICRISAT Center, during 1977–83, the average percentage parasitism of first to third instar larvae, which are only parasitised byCampoletis chlorideae, was 44·2 on sorghum, 33·1 on chickpea, 32·6 on pearl millet, 7·1 on groundnut and 4·2 on pigeonpea. Parasitism in pesticide-treated crops was lower than in untreated crops. Ten species of hyperparasites were recorded from cocoons ofCampoletis chlorideae. Hyperparasitism was around 40% on cereals and 10% on legumes.

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