水稻黑条矮缩病是水稻灰飞虱传播的一种病毒病 ,主要感染稻麦、玉米及早熟禾等禾本科杂草。此病于 60年代中后期在我县及浙江各县市流行 ,此后一直消声匿迹 ,发生很轻。 1 997年开始 ,我县晚稻上此病突然再度暴发流行 ,发生面积达 9个乡镇 2 0 0 0多 hm2 。 1 998年扩大到 1 5 Rice black-streaked dwarf disease is a viral disease transmitted by the rice planthopper, and mainly infects gramineous weeds such as rice and wheat, corn and bluegrass. The disease in the mid and late 1960s in counties in Zhejiang and Zhejiang epidemic, has since disappeared, occurred very light. Beginning in 1997, a sudden outbreak of the disease suddenly occurred in our county on late rice, with an area of ​​more than 20,000 hm2 in nine towns. In 1998 it expanded to 15