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Volume 4 Issue 2
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Article Navigation >  Forest Research  > 1991 >  4(2): 128-132

Citation:
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The Developmental Threshold and the Control Threshold of Larch Leaf Cast

  • 1.

    Forestry Institute of Jilin City, Jilin Province

  • 2.

    Forestry Institute of Jilin Province

  • 3.

    Forestry Bureau of Panshi County, Jilin Province

  • 4.

    Huangnihe Forestry Bureau, Jilin Province

  • Received Date: 1990-12-12
  • The volume loss caused by larch leaf cast can be expressed by the equation: Y=9.8/(1+e7.3459-0.1x). The control threshold can be determined by the equation:9.8C[1/(1+e7.3459-0.1x)-1/(1+e7.3459-0.1(1-Q)x)]-E=0 Therefore, 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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  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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The Developmental Threshold and the Control Threshold of Larch Leaf Cast

  • 1. Forestry Institute of Jilin City, Jilin Province
  • 2. Forestry Institute of Jilin Province
  • 3. Forestry Bureau of Panshi County, Jilin Province
  • 4. Huangnihe Forestry Bureau, Jilin Province
  • Received Date: 1990-12-12
  • Available Online: 2012-12-04

Abstract: The volume loss caused by larch leaf cast can be expressed by the equation: Y=9.8/(1+e7.3459-0.1x). The control threshold can be determined by the equation:9.8C[1/(1+e7.3459-0.1x)-1/(1+e7.3459-0.1(1-Q)x)]-E=0 Therefore, 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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