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 |
Green gram (Vigna radiata (L.)) is one of the most important pulse crops in India and is highly susceptible to infestation by the pulse beetle, Callosobruchus chinensis, a major pest of stored pulses in tropical and subtropical regions. The present study evaluated the life table parameters, growth, and developmental biology of C. chinensis on green gram seeds treated with different botanical grain protectants under laboratory conditions. An age-specific life table experiment was initiated with a cohort of freshly laid eggs and continued until the death of all adults to assess survivorship and female fecundity. The treatments included untreated control (T1), neem leaf powder (T2), chili powder (T3), clove basil leaf powder (T4), and talc powder (T5). Significant differences were observed among treatments for all biological parameters. The net reproductive rate (R?) was highest in the untreated control (32.3 females/female) and was significantly reduced in treated grains, with values of 10.347 (T2), 18.73 (T3), 19.77 (T4), and 15.91 females/female (T5). The mean generation time (T) ranged from 34.57 to 36.77 days across treatments. The doubling time (DT) was lowest in the control (6.89 days) and increased in treated grains, ranging from 8.0 to 10.55 days, indicating slower population growth under botanical treatments. Potential fecundity (Pf) was also markedly reduced in treated grains compared to controls. In all treatments, the approximate intrinsic rate of increase (rapprox) was slightly lower than the accurate intrinsic rate of increase (raccurate). Overall, the life table parameters clearly demonstrate the suppressive effect of botanical grain protectants on the population growth of C. chinensis. The findings suggest that these botanicals can serve as effective, eco-friendly alternatives for the management of pulse beetle in stored green gram.
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