National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Investigations were carried out on biology of ear head worm, Helicoverpa armigera (Hub.) in pearl millet at Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar during the year 2011. External features of all the stages were described and length and width of all the stages were measured and reported. The duration of various stages was studied under laboratory conditions at an average temperature of 17.50 ± 1.70 oC and 57.10 ± 9.42 per cent relative humidity. The incubation period was 3.80 days and 87.65 per cent eggs hatched. Freshly hatched larva fed on stigma and later instar of the larvae fed on anthers and grown on ear head by preparing protection cover of dry anthers. It also damage ear head covering leaves. The larvae passed through six instars. The total larval, prepupal and pupal period was 19.20, 1.64 and 12.48 days, respectively. Maximum pupation took place in soil between 2 to 8 cm depths in dry soil. Sex ratio of male: female was 1:1.16 shows preponderance of female population over male. The average pre-oviposition, oviposition and post-oviposition periods were 3.08, 4.52 and 1.92 days, respectively. The average fecundity was 565 eggs per female, when reared on pearl millet. The average longevity of male and female was 7.56 ± 1.29 and 9.52 ± 1.42 days whereas total life period was 44.68 ± 2.23 and 46.64 ± 1.41days when reared on pearl millet.
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