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在建立小黑杨肿茎溃疡病预测模式以后,插条苗根据地茎、苗级、各病情等级的剪穗数量,测算各病情指数的损失量;留床苗则根据苗高、病情等级的损失标准,测算各病情指数的损失量。以此来确定其经济损失阈值和相应的防治指标。结果插条苗病情指数为16时为经济损失阈值,大于17时为防治指标,17—21时要重点防治,21以上时必须全面防治,留床苗病情指数为18时为经济损失阈值,大于19时为防治指标,19—23时要重点防治,23以上时必须全面防治。
In the establishment of Populus euphorbiae ulcer disease prediction model, cuttings seedlings according to the stem, seedling level, the severity of the scion of the number of spikes, the calculation of the loss of disease index; stay bed seedlings according to the seedling height, the severity of the loss Standard, calculate the loss of each disease index. In order to determine the economic loss threshold and the corresponding control indicators. Results The cuttings seedling disease index of 16 was the economic loss threshold, when it was more than 17, it was the prevention and control index, and 17-21 was the key prevention and treatment. When it was above 21, the prevention and control index should be fully controlled. The index of economic loss when the bed seedling disease index was 18 was greater than 19:00 for the prevention and control targets, 19-23 should focus on prevention and control, more than 23 must be comprehensive prevention and treatment.