稻纵卷叶螟是我省水稻四大害虫之一。水稻受害后,结实率、千粒重降低,空壳率增加,一般减产10-20%,严重的达30%以上。对于该虫的防治指标,过去研究较少。国内曾有人提出百蔸禾有幼虫15条作为防治指标,实践证明,采用这一指标指导防治用药面积过大。我们认为,防治指标的确定应以减 Rice leaf roller is one of the four major pests in rice in our province. After the damage of rice, the seed setting rate, 1000-grain weight decreased, the shell rate increased, the general reduction of 10-20%, a serious up to 30%. For the insect control indicators, the past less research. Some people in China have proposed that there are 15 larvae of Baihuhe as a prevention and control index. Practice has proved that the use of this indicator guides the prevention and treatment of over-medication. In our opinion, the prevention and control index should be reduced