为了掌握梨树害虫的发生量,从而制定有效的防治措施,调查梨树的越冬虫口密度是非常必要的。通过几年实践,笔者总结出一套简单易行的调查方法,供参考。一、梨星毛虫结合刮树皮,随机选择5株树,采用翘树皮找虫法,共调查100平方厘米以上面积,如果每平方厘米有虫0.1头以上时,即有大 In order to grasp the occurrence of pear pests, so as to formulate effective control measures, it is necessary to investigate the population density of pear overwintering insects. After several years of practice, the author summed up a set of simple survey methods for reference. First, pear caterpillars combined with scraping the bark, randomly selected five trees, the use of Alice bark looking for insects, a total area of ​​more than 100 square centimeters surveyed, if there is 0.1 per square centimeter or more, that is, large