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Journal of Biological Sciences
Year: 2007  |  Volume: 7  |  Issue: 6  |  Page No.: 993 - 996

Influence of Abiotic Environment on the Population Dynamics of Mustard Aphid, Lipaphis Erysimi (Kalt.) On Brassica Germplasm

M.S. Ansari, Barkat Hussain and N.A. Qazi    

Abstract: The natural appearance of mustard aphid on Brassica germplasm was observed on 11th January (60 DAS) and disappeared after 2nd March (110 DAS). The peak aphid population was found at a maximum, minimum and average temperature of 23.37°, 6.87° and 15.76°C, respectively and mean relative humidity of 54.75% on 10th February at 90 DAS. Then, decline in aphid population and simultaneously increase of Coccinella was at 100 and 110 DAS, respectively. Maximum and average temperature showed as positively non-significant effect while minimum temperature caused negatively non-significant on the population of aphid. However, relative humidity had a negative effect. Late appearance of Coccinella too could not have any regulatory effect on the incidence of this pest.

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