Effect of variable weather condition on the population dynamic of mustard aphid

Mustard is a major oilseed crop grown during rabi season. Weather variability causes substantial fluctuations in any crop production a field experiment was conducted during Rabi season of 2015-16 on the topic entitled “Effect of variable weather condition on the population dynamic of mustard aphid” in sandy loam soil of N.D. University of Agriculture and Technology, Kumarganj, Faizabad (U.P.). The experimental comprised of three growing environments viz., 15th, October, 30th, October, 14th, November and three cultivars viz., NDR-8501, Varuna and Vardan. Results revealed that growing environments of 15th, October produced significantly higher growth yield attributes and yield due to fulfilment of optimum Accumulation heat unit requirement and solar radiation interception requirement for various plant processes. The number of siliquae plant-1 number of seed siliqua-1 in growing environment14th, November reduced which ultimately resulted the lowest seed yield.