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1.划区定点:按种子数量、堆装方式确定检查点: (1)散装种子每区检查面积不超过25平方米,在每区的四角和中心各设一点,共5点。四角各点设在距边缘50厘米处,同一检验单位内相邻区的角点可以合并设在各区边界上。如一区设5点,二区设为8点。 (2)袋装种子10袋以下扦取总袋数的l/2,11～20袋扦取6袋,然后按角增加20袋增扦1袋。 2.取样:仓虫的分布状况因气侯条件和虫种不同而发生变化。例如麦蛾的幼虫潜伏在籽实内,一般不易见到,而见到的多半是善飞的成虫。检查时只要随手抓一把种子向周围撒去。由于面层受震动后,麦蛾就飞起来,这时候看其飞翔情况,即可估计虫口密度。
1. The designated area: according to the number of seeds, stacked way to determine the checkpoint: (1) bulk seeds per area inspection area of not more than 25 square meters, each corner of the four corners and the center set a total of 5 points. Each corner of the four corners is located 50 centimeters from the edge. The corners of adjacent areas within the same inspection unit can be combined at the boundaries of each area. If a district set 5:00, the second district set at 8:00. (2) Bagged bags 10 bags of the following total number of sticks taken l / 2, 11 to 20 bags of sticks take 6 bags, and then increase the angle of 20 bags by sticking 1 bag. 2. Sampling: The distribution of caterpillars changes due to climatic conditions and insect species. For example, the moth larvae lurk in the seed, generally not easy to see, but to see most of them are good fly adults. Just grab a handful of seeds and scatter around. As the surface by the shock, the moth on the fly, this time to see the flight conditions, you can estimate the population density.