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Chakravarty, Snehel
- Biology, Relative Parasitization of Larval Endoparasitoid Campoletis cholrideae Uchida on Heliocoverpa armigera Hübner under Sole and Chickpea-coriander Intercropping System
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Authors
Affiliations
1 Department of Entomology, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarkhand, IN
2 Department of Entomology and Zoology, Institute of Agriculture science, BHU, Varanasi-221005, Uttar Pradesh, IN
1 Department of Entomology, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarkhand, IN
2 Department of Entomology and Zoology, Institute of Agriculture science, BHU, Varanasi-221005, Uttar Pradesh, IN
Source
Journal of Biological Control, Vol 30, No 2 (2016), Pagination: 84-90Abstract
The Campoletis cholrideae is a single most prominent parasitoid in chickpea for major pest Heliocverpa armigera under natural ecosystem. The purpose of present study was to investigate how weather parameters and cropping system influence on the biology, per cent parasitization in sole and intercropping system, under laboratory and field conditions. In sole crop, mean parasitism by C. chlorideae on the larvae of H. armigera during 2013 and 2014 was 60.61 %, 44.66 % respectively. Egg-larval and cocoon formation to adult emergence periods 10.16 ± 0.215, 4.25 ± 2.02 days respectively and female and male parasitoid could survive with a mean longevity of 4.50 ± 2.012 and 3.25 ± 1.85 days, respectively. Higher parasitism of 76.67% occurred on 8th collection of 11th S.W March and 60.67% on 1st collection of 11th S.W of March for respective years. The progeny of sex-ratio varied in two seasons, the mean sex ratio (M:F) were 1:1.62; 1:1.07 respective years in sole crop. In intercropping ecosystem, the overall mean parasitism by C. chlorideae on larvae of H. armigera during 2013 and 2014 with 76.96 %, 66.67 % respectively. Higher parasitism was observed (90 %) on 6th collection of 11th S.W March and 80 % on 1st collection of 11th S.W of March for respective years. However there was steep escalation in female sex ratio in chickpea-coriander cropping system when compared with sole crop. The overall mean sex ratio were (M:F) is 1:1.90; 0.98:1.0 respective years in chickpea-coriander intercropping. A correlation with abiotic factors revealed a non-significant positive correlation with maximum temperature, evening relative humidity (RH), rain fall and sunshine hours. There was a negative correlation between parasitism and minimum temperature and morning RH in respective years under sole crop. In case of intercropping system, the result elucidated that a significant positive correlation exist with evening RH and rainfall (r= 0.951; r= 0.900 and r= 0.926; r= 0.931) in respective years. These results suggested that different parameters, especially cropping system and temperature, were very important for the parasitism of C. chlorideae on H. armigera.Keywords
Chickpea, coriander, intercrop, Campoletis cholrideae, Heliocverpa armigeraReferences
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- Morphology of Immature Stages and Adults of Helicoverpa armigera
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Authors
Affiliations
1 Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221005, IN
1 Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221005, IN
Source
Indian Journal of Entomology, Vol 84, No 3 (2022), Pagination: 588-593Abstract
Helicoverpa armigera (Hübner) is a highly polyphagous insect pest of worldwide occurrence, including India. In the present study, a detailed morphological assessment of H. armigera showed the following: typically dome-shaped egg with ribbed surface; larva having coriaceous skin, biordinal crochets and 11 primary setae on the prothoracic segment; pupa adecticous and obtect with prominent posterior tip cremaster; and adult forewings characterized by the presence of 7-8 black spots along the apical margin and a reniform shaped brown marking, more prominent on the underside. Adults exhibit sexual dimorphism in the colour of vestiture and forewings. The genitalic traits like the presence of usually 12 or less sets of cornuti in aedeagus, apically broadened harpe having length ranging between 4.5 to 4.9 mm and a single lobe at the base of everted vesica in males, and four distinct signa on bursa copulatrix in females, also distinguishes it from other congeneric species.Keywords
Helicoverpa armigera, morphology, egg, larva, chaetotaxy, pupa, wings, sexual dimorphism, genitaliaReferences
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