INFLUENCE OF ABIOTIC FACTORS ON THE INCIDENCE OF CABBAGE APHID BREVICORYNE BRASSICAE (L.) ON RED CABBAGEVipul H. Wagh and Akshay P. Kharat
A field experiment was conducted to study the seasonal incidence of cabbage aphid, Brevicoryne brassicae (L.) (Hemiptera: Aphididae) on red cabbage for two consecutive years of 2010-11 and 2011-12 at District Seed Farm (AB-Block), Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia, West Bengal. Aphids were first appeared during fourth week of January during both years then population of the pest gradually increased to reach its peak during last week of February to first week of March. Afterwards population goes in declining phase. Maximum temperature, minimum temperature indicated highly significant positive correlation while both maximum and minimum RH% indicated highly significant negative correlation. Rainfall showed non significant negative relation. Multiple correlation of the two years pooled data of the aphid population with weather factors showed positive correlation for temperature and wind velocity, while the correlation was negative with relative humidity and rainfall.
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