The developmental threshold was fixed at 26 of disease index based on the relative error margin analysis.
根据感病损失量方程，病情很轻时损失甚微，经相对误差限法分析，将病情指数26定为该病的发生指标。
The developmental threshold and effective accumulative temperature of Obolodiplosis robiniae (Haldemann) , an important insect pest of Robinia pseudoacacia, were studied in the laboratory.
在实验室条件下对刺槐叶瘿蚊的发育历期、发育起点温度和有效积温进行了研究。
The developmental threshold and effective accumulative temperature of Obolodiplosis robiniae (Haldemann) , an important insect pest of Robinia pseudoacacia, were studied in the laboratory.
在实验室条件下对刺槐叶瘿蚊的发育历期、发育起点温度和有效积温进行了研究。
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