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玉米是我县第二大粮食作物,近年来,大面积推广抗病丰产品种使产量不断提高,但我县地处我国南北农业分界的秦淮线上,作物布局有利于粘虫的迁入为害,是二代粘虫的常发区,且二代粘虫具有突发性和暴发性。1983年粘虫在我县玉米田大发生,危害盛期,玉米田平均百株虫量达280多头,损失玉米400多万公斤。因此,摸清粘虫在我县的发生规律,提高预测预报水平,对我县发展玉米生产非常重要。近年来,我们采用黑
Maize is the second largest grain crop in our county. In recent years, large-scale popularization of disease-resistant varieties has led to continuous improvement. However, the county is located on the Qinhuai line between the north-south agricultural demarcation line in our country. The crop layout is conducive to the migration of armyworms , Is the second generation of armyworm habitat, and the second generation of armyworms with sudden and explosive. In 1983, the armyworm occurred in our county corn field, which threatened the peak time. The average number of hundred insects in the corn field reached more than 280 and the loss of more than 4 million kilograms of corn. Therefore, to understand the occurrence of Mythimna separata in our county to improve the level of forecasting, corn production in our county is very important. In recent years, we adopt black