【摘要】 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。更多还原

【Abstract】 s: The population peak of aphids in rape fields in Guangde county occurred between Nov. 20th and Dec 20th, and it was the highest population peak during its incidence, the consecutive second highest population peak might appear along with the rises in temperature after winter in its outbreak years. The two peaks had the homologous relations with the fast vegetative growth (4～7 leaf stage) period and stem elongation period of rape. Warm and dry weather in early spring and a warm winter easily usually led to the outbreaks of the aphids; some factors such as low temperature and rainy days, moist fields, weeds could decrease aphid population. There were significantly positive correlation between the amount of winged aphids and total amount of aphids in rape fields.更多还原