高粱蚜虫是我县主要暴发性害虫。其主要特点是,繁殖速度快,发展蔓延迅猛。若防治不及时,往往会造成大面积减产或绝产。对粮食生产威胁甚大。因此,研究高粱蚜虫的发生条件,搞好发生数量预报,对合理制定防治策略,有效地控制危害,是非常重要的。一、影响高粱蚜虫数量变动的重要因子(一)冬前9月中旬的温雨系数与高粱蚜虫发生程度密切相关 9月中旬在当地 Sorghum aphid is the main outbreak of pests in our county. Its main feature is the rapid propagation and rapid development of the spread. If the prevention and treatment is not timely, it will often result in large-scale production cuts or abortion. Great threat to food production. Therefore, it is very important to study the occurrence condition of sorghum aphid and do a good job in predicting the occurrence quantity. It is very important to make a reasonable prevention and cure strategy and control the harm effectively. First, an important factor affecting the amount of sorghum aphid changes (a) winter before mid-September the temperature coefficient and sorghum aphids are closely related to the degree in mid-September at the local