Green Global
Foundation Journal
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STUDY ON THE POPULATION DYNAMICS OF MUSTARD APHID, Lipaphis erysimi (Kalt.) IN RELATION TO WEATHER PARAMETERS IN CHITTAGONG (Pages : 20 - 22)
M. H. RASHID, M. M. RAHMAN, A. K. M. MATIAR RAHMAN, M. MOHIUDDIN and M. A. R. CHOUDHURYThe population dynamics of mustard aphid, Lipaphis erysimi (kalt.) on six variety and germplasm of mustard in relation to weather parameters was studied at Regional Agricultural Research Station, Hathazari, Chittagong during the Rabi 2006?07 crop season. This study will provide an opportunity to fact the pest challenge by manipulating the manageable ecological parameters in the form of planting or harvesting time adjustment, varietals selection, correct time of pesticide application, etc. The natural appearance of mustard aphid on variety and germplasm of mustard was observed on January 03, 2007 (50 days after sowing) and disappeared after mid February (92 days after sowing). The peak aphid population was found at a minimum, maximum and average temperature of 13.57, 25.86 and 19.72 respectively and a mean relative humidity of 88.86% on 24th January at 71 DAS. Then, decline in aphid population. Correlation coefficient (r) showed a positive effect with minimum, maximum and average temperature. Whereas mean relative humidity showed significantly negative effect. Download