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用田间接虫和模拟打孔方法研究莱青虫在秋甘蓝上的防治指标。莱青虫虫量与甘蓝莱产量呈负相关,其线性回归式为Y=22.7757-0.4323M。人工模拟打孔试验与接虫试验结果一致。甘蓝莱的叶面积损失率与产量损失率成正相关,其线性回归式为Y=0.009549+2.095D±2.0561。根据莱青虫的为害与产量损失的关系,结合防治工本费、收益及害虫的种群动态等,秋甘蓝菜上莱青虫的经济阈值为40—46头/百株。 用序贯抽样法确定了秋甘蓝菜上莱青虫防治与否的理论界限方程分别为:d_1=0.4291N+20.44,d_0=0.4291N-20.44。
Study on the Prevention and Cure Indexes of Leylagswort on Autumn Cabbage with Field Pests and Simulation Punch Method. The amount of larvae was negatively correlated with the yield of cabbage, and the linear regression was Y = 22.7757-0.4323M. The artificial simulated drilling experiment is consistent with the experimental results The leaf area loss rate of Brassica napus was positively correlated with the yield loss rate. The linear regression equation was Y = 0.009549 + 2.095D ± 2.0561. According to the relationship between the larvae ’s damage and the yield loss, the economic threshold of the larvae of cabbage in autumn cabbage is 40-46 pigs per 100 plants, combined with the cost of prevention and cure, income and pest population dynamics. Sequential sampling method was used to determine whether the theoretical limit equations for preventing and controlling larvae in autumn cabbage were d_1 = 0.4291N + 20.44 and d_0 = 0.4291N-20.44.