一、调查内容和方法系统观测1.淘土查虫①淘土时间、次数及取样数量规格第一阶段:在小麦秋播整地前进行,根据当年剥麦穗查幼虫的情况,选择虫量大并有代表性的麦田2—3块,进行一次淘土,以掌握越冬虫口基数,并做为第二年系统观测田,面积不能小于2—3亩。每块田按对角线或棋盘式取样5—10个,每样方面积为10×10厘米,深20 First, the investigation content and methods of system observation 1. Amoy soil pests ① Tao time, frequency and sampling the number of specifications The first phase: before the autumn planting of wheat to carry out, according to the current investigation of larvae of wheat ears, the choice of large insect And 2-3 representative wheat fields, a time to Amoy to grasp the base of the population of overwintering, and as the second year of systematic observation field, the area can not be less than 2-3 acres. Each field diagonal or checkerboard sampling 5-10, each sample area of ​​10 × 10 cm, depth 20