| 落叶松落叶病发生指标和防治指标的研究 |
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| 引用本文： | 常乃庆,张启云,佟影,刘国荣,王世君,王永民,孙礼,王景荣,张锡芝,王志军.落叶松落叶病发生指标和防治指标的研究[J].林业科学研究,1991,4(2):128-132. |
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| 作者姓名： | 常乃庆 张启云 佟影 刘国荣 王世君 王永民 孙礼 王景荣 张锡芝 王志军 |
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| 作者单位： | 吉林省吉林市林业科学研究所
(常乃庆，张启云，佟影)，吉林省林业科学研究所
(刘国荣，王世君，王永民)，吉林省磐石县林业局
(孙礼，王景荣)，吉林省黄泥河林业局
(张锡芝)，吉林省黄泥河林业局(王志军) |
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| 摘 要： |
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| 关 键 词： | 落叶 落叶病 发生 指标 防治 |
| 收稿时间： | 1990/12/12 0:00:00 |
The Developmental Threshold and the Control Threshold of Larch Leaf Cast |
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| Chang Naiqing,Zhang Qiyun,Tong Ying,Liu Guorong,Wang Shijun,Wang Yongmin,Sun Li,Wang Jingrong,Zhang Xizhi and Wang Zhijun.The Developmental Threshold and the Control Threshold of Larch Leaf Cast[J].Forest Research,1991,4(2):128-132. |
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| Authors: | Chang Naiqing Zhang Qiyun Tong Ying Liu Guorong Wang Shijun Wang Yongmin Sun Li Wang Jingrong Zhang Xizhi and Wang Zhijun |
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| Institution: | Forestry Institute of Jilin City, Jilin Province;Forestry Institute of Jilin City, Jilin Province;Forestry Institute of Jilin City, Jilin Province;Forestry Institute of Jilin Province;Forestry Institute of Jilin Province;Forestry Institute of Jilin Province;Forestry Bureau of Panshi County, Jilin Province;Forestry Bureau of Panshi County, Jilin Province;Huangnihe Forestry Bureau, Jilin Province;Huangnihe Forestry Bureau, Jilin Province |
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| Abstract: | The volume loss caused by larch leaf cast can be expressed by the equation: r = 9.8/(1+ e7.3459-0.1x). The control threshold can be determined by the equation:9.8 C1/(l + e7.3459-0.1x) - 1/(1+ e7.3459-0.1(1-Q)x)] - E = 0Therefore, the control threshold was settled at 46 of disease index in terms of current control technique and economic standard. The volume loss can be neglected when the disease index was below 26, according to the volume loss equation. The developmental threshold was fixed at 26 of disease index based on the relative error margin analysis. |
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| Keywords: | larch leaf cast developmental threshold control threshold |
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