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经研究,四纹、弓斑、大黑、暗黑、黑皱、黑绒等六种蛴螬及蛴螬类田间分布型均属负二项分布.蛴螬多以混合发生,可采用序贯抽样调查。蛴螬类公共 K 值为1.403,轻度发生和中等发生分级为H_0=0.75,H_1=1.25,拒绝与接受线为 d_0=5.87_n-7.28,d_1=5.87_n+7.28;中等发生和严重发生分级为 H_1=1.05,H_2=2.00,拒绝与接受线为 d_1=6.36_n-9.94,d_2=6.36n+9.94。根据调查结果确定防治措施。
According to the research, the distribution patterns of six species of 蛴 螬 and 蛴 螬 in four-pattern, bow-spot, big black, dark black, black wrinkle and black velvet are all negative binomial distributions. The common K value of 蛴 螬 class was 1.403, mild and moderate occurrences were H_0 = 0.75, H_1 = 1.25, and the rejection and acceptance lines were d_0 = 5.87_n-7.28 and d_1 = 5.87_n + 7.28; H_1 = 1.05, H_2 = 2.00. The rejection and acceptance lines are d_1 = 6.36_n-9.94 and d_2 = 6.36n + 9.94. According to the survey results to determine prevention and control measures.