随着种植方式的变化，田间寄主作物不断增多，近年螟虫在浙江省水稻产区有加重发生趋势。据有关资料表明：近１５ａ来浙江省水稻螟害平均每年发生１９２万ｈｍ２次；尤其在去年，全省水稻螟虫发生面积达２３３万ｈｍ２，因螟害造成的损失在７万ｔ以上，占全年虫害发生面积... With the change of planting methods, the number of field host crops is on the increase. In recent years, the stem borers tend to increase in the rice producing areas in Zhejiang Province. According to relevant data, the average annual incidence of rice stem borers in Zhejiang Province has reached 1.92 million hm 2 times during the past 15 years. Especially in the past year, rice borers in the province had an area of ​​2.33 million hm 2 and the damage caused by stem borer was more than 70,000 tons Annual pest occurrence area ...