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广德县油菜蚜虫发生高峰出现于11月20日至12月20日,为全生育期主峰,大发生年可随冬后气温回升出现第二高峰。两峰与油菜营养生长旺盛期(四至七叶期)、蕾薹期有对应关系。暖冬及早春温暖干旱天气容易导致大发生;低温多雨、田间潮湿、多杂草对蚜虫种群发展不利。有翅蚜数量与蚜虫总量呈极显著正相关关系。
The peak of rape aphid appeared in Guangde County from November 20 to December 20, which is the main peak of the whole growth period. The occurrence of the second largest peak may occur with the rise of winter temperature. Two peaks and rape vegetative growth period (four to seven leaves), budding period has a corresponding relationship. Warm winter and early spring warm and dry weather easily lead to big occurrence; low temperature and rainy, wet fields, weeds on the population development of aphids adverse. There was a significant positive correlation between the number of winged aphids and the total amount of aphids.