Short term forecast model of disease development and wood loss rate are built. Control guideline and economic threshold value are decided.
建立了病害发生的短期测报模型和材积损失率估测模型，确定了病害的防治指标和经济阈值。
The paper also gives formulae for different Yunnan pine forest areas to calculate their own economic threshold according to their special situations.
本文还给出了各云南松林区可以用来根据自己的具体情况计算出适合自己的经济阈值的公式。
Based on the direct benefit and cost, the economic threshold of the third generation bollworm was calculated to be 35 eggs per 100 plants for all the levels of soil fertility.
根据防治的直接收益与直接代价，算出了第三代棉铃虫的经济阈值为百株累计卵量35粒，这一阈值可适用于不同肥力水平的地块。
Based on the direct benefit and cost, the economic threshold of the third generation bollworm was calculated to be 35 eggs per 100 plants for all the levels of soil fertility.
根据防治的直接收益与直接代价，算出了第三代棉铃虫的经济阈值为百株累计卵量35粒，这一阈值可适用于不同肥力水平的地块。
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