近年来,滇中许多地区水稻螟虫的危害有普遍回升的趋势,一般螟害率2—39％、有相当一部分地区,仅白穗率即达3～5％;严重的在10％以上。据不完全统计,螟害损失估计在一亿斤以上,可见水稻螟害仍是发展水稻生产的一大障碍。我省治螟工作已有二十多年历史,各地有许多很好的防治经验。目前,许多地方治螟工作也抓得较紧。在这种情况下,螟害为什么回升?同时,因为大面积推广使用药剂治螟而影响农田生态平衡,致使一些次要害虫如飞虱、叶蝉等上升成为主要害虫,给生产带来更多的威胁;许多地方反映“防不胜防”、“害虫越防越多”,乃至用药愈来愈 In recent years, the damage of rice stem borers in many areas in Yunnan has a general trend of recovery. The general rate of stem borer is 2-39%. In quite a few areas, the percentage of white spike is only 3% to 5%, and the seriousness is 10%. According to incomplete statistics, the loss of stem borer is estimated to be over 100 million kg, showing that rice stem borer damage is still a major obstacle to the development of rice production. In our province, it has been more than 20 years since the work of controlling rice borers in our country. There are many good prevention and control experiences in various places. At present, many local regulations for stem borer work are also tightened. In this case, why the stem borer rebound? At the same time, because of the promotion of large-scale use of chemical agents to affect the ecological balance of farmland, resulting in some minor pests such as planthoppers, leafhoppers and so on as a major pest, to bring more production The threat of many places to reflect “prevent failing to prevent”, “the more pests and more defensive,” and even medication more and more