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玉米粗缩病在石家庄地区早有零星发生。近年来,由于棉麦套种和麦田套种玉米,此病有蔓延趋势。 玉米粗缩病是一种病毒病害,传毒媒介为灰飞虱。飞虱在我区一年发生五代。 发病规律 玉米粗缩病的发生发展,取决于灰飞虱田间数量和带毒个体的多少。灰飞虱的田间消长又与以下栽培条件有密切关系。 1.套种玉米田发病重于单播田:玉米粗缩病的发展是伴随三种三收和麦套玉米面积的扩大而逐年加重。分析造成套种玉米田发病重的原因,一是夏
Corn shrank in Shijiazhuang area sporadic. In recent years, due to cotton and wheat intercropping corn and intercropping wheat, the disease has a tendency to spread. Corn rough disease is a virus disease, vector for the Laodelphax striatellus. Five generations of planthoppers occur in our district in one year. The incidence of maize disease occurrence and development, depending on the number of fecundity and the number of infected individuals. The field growth and development of Laodelphax striatellus is closely related to the following cultivation conditions. Intercropping maize fields are more serious than unicast fields: The development of maize synusia is increasing year by year with the expansion of three types of maize and maize. Analysis of the causes of intercropping corn field incidence of heavy, one summer