Techniques of forecasting and predicating Dendrolimus houi

ZHAO Ren-you; XU Zhen-wang; LUO Song-gen; YANG Shao-li

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Volume 20 Issue 1

Jul. 2017

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Article Navigation > Journal of Zhejiang A&F University > 2003 > 20(1): 49-53

ZHAO Ren-you, XU Zhen-wang, LUO Song-gen, YANG Shao-li. Techniques of forecasting and predicating Dendrolimus houi[J]. Journal of Zhejiang A&F University, 2003, 20(1): 49-53.

Citation:

ZHAO Ren-you, XU Zhen-wang, LUO Song-gen, YANG Shao-li. Techniques of forecasting and predicating Dendrolimus houi[J]. Journal of Zhejiang A&F University, 2003, 20(1): 49-53.

Techniques of forecasting and predicating Dendrolimus houi

1.
Forest Disease and Pest Control Station of Lishui City , Lishui 323000, Zhejiang , China;
2.
Forest Disease and Pest Control Station of Suichang County , Suichang 323300, Zhejiang , China

Received Date: 2002-05-08
Rev Recd Date: 2002-11-25
Publish Date: 2003-02-20

Abstract

By raising and observing the larva of Dendrolimus houi , it is known that the larva is 7 instars .Their average appetite is 104.4 g and increases distinctly after 4 instars .Therefore , the prevention and control of the insect shall be carried out before 4 instars .The 1 ～ 2 instar larva has a high death rate , accounting for 30 %～40 %.The death rate decreases after 3 instars and their population is stable .It is the best opportunity to carry out forecast and investigation .The formula to calculate the leave quatity by the diameter of Cryptomeria fortuneicrown is lgW =a +blgD .The formula establishes the grade of Cryptomeria fortunei crown and insect pest .The formula of the distribution pattern of the insect is ＊m =14.275 7 +1.124 0m .The formula for the predication of population of insect number in a tree by the average insect number in two lower branches is y =9.754 4x1.157 4 .These formulas conform to the requirement for precision and promote the working efficiency .
- Dendrolimus houi,
- space distribution pattern,
- sample technique,
- predication technique

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Techniques of forecasting and predicating Dendrolimus houi

1. Forest Disease and Pest Control Station of Lishui City , Lishui 323000, Zhejiang , China;

2. Forest Disease and Pest Control Station of Suichang County , Suichang 323300, Zhejiang , China

Received Date: 2002-05-08
Rev Recd Date: 2002-11-25
Publish Date: 2003-02-20

Key words:

Abstract: By raising and observing the larva of Dendrolimus houi , it is known that the larva is 7 instars .Their average appetite is 104.4 g and increases distinctly after 4 instars .Therefore , the prevention and control of the insect shall be carried out before 4 instars .The 1 ～ 2 instar larva has a high death rate , accounting for 30 %～40 %.The death rate decreases after 3 instars and their population is stable .It is the best opportunity to carry out forecast and investigation .The formula to calculate the leave quatity by the diameter of Cryptomeria fortuneicrown is lgW =a +blgD .The formula establishes the grade of Cryptomeria fortunei crown and insect pest .The formula of the distribution pattern of the insect is ＊m =14.275 7 +1.124 0m .The formula for the predication of population of insect number in a tree by the average insect number in two lower branches is y =9.754 4x1.157 4 .These formulas conform to the requirement for precision and promote the working efficiency .

ZHAO Ren-you, XU Zhen-wang, LUO Song-gen, YANG Shao-li. Techniques of forecasting and predicating Dendrolimus houi[J]. Journal of Zhejiang A&F University, 2003, 20(1): 49-53.

Citation:

ZHAO Ren-you, XU Zhen-wang, LUO Song-gen, YANG Shao-li. Techniques of forecasting and predicating Dendrolimus houi[J]. Journal of Zhejiang A&F University, 2003, 20(1): 49-53.

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Techniques of forecasting and predicating Dendrolimus houi

1. Forest Disease and Pest Control Station of Lishui City , Lishui 323000, Zhejiang , China;

2. Forest Disease and Pest Control Station of Suichang County , Suichang 323300, Zhejiang , China

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Techniques of forecasting and predicating Dendrolimus houi

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通讯作者: 陈斌, bchen63@163.com

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Techniques of forecasting and predicating Dendrolimus houi

1. Forest Disease and Pest Control Station of Lishui City , Lishui 323000, Zhejiang , China; 2. Forest Disease and Pest Control Station of Suichang County , Suichang 323300, Zhejiang , China

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1. Forest Disease and Pest Control Station of Lishui City , Lishui 323000, Zhejiang , China;

2. Forest Disease and Pest Control Station of Suichang County , Suichang 323300, Zhejiang , China