Author:
G. S. Uma,M. C. Keerthi,Kalia Vinay Kumari
Abstract
The aptness of two hosts viz., cotton and brinjal for mass rearing of Aphis gossypii Glover under laboratory conditions was investigated using the age-stage and two-sex lifetable method. The results showed that A. gossypii could complete its entire lifecycle on both hosts. The total nymphal duration (7.93± 0.33 days), reproductive period (6.95± 0.60 days), adult longevity (8.11± 0.68 days) and fecundity (24.66± 2.34 days) were significantly higher on brinjal than on cotton. The differences in pre-reproductive and post-reproductive periods on both hosts were not statistically significant. The mean reproductive period was longer on brinjal (6.95± 0.56 days) than that on cotton (5.06± 0.47 days); consequently, the fecundity was also significantly high in brinjal (24.66± 2.34 nymphs/ female) compared to cotton (14.11± 1.31 nymphs/female). The difference in an intrinsic rate of increase, infinite rate of increase and doubling time were non-significant. In contrast, the net reproductive rate, gross reproduction rate, and mean generation time on brinjal were significantly higher. Lifetable parameters such as age-stage-specific survival rates, fecundity, life expectancy and reproductive value of A. gossypii were higher on brinjal compared to cotton. The results of this study indicate that brinjal is a better host than cotton for the mass rearing of A. gossypii.
Publisher
The Entomological Society of India
Subject
Insect Science,Agronomy and Crop Science,Ecology,Ecology, Evolution, Behavior and Systematics
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