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Volume 4 Issue 2
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Article Navigation >  Forest Research  > 1991 >  4(2): 167-171

Citation:
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The Preventive Threshold of Cryptothelea variegata

  • 1.

    Forest Pests and Diseases Control Station of Shanxi Province

  • 2.

    Northwestern College of Forestry

  • Received Date: 1990-01-10
  • Cryptothelea variegata Snellen harms leaves of Paulownia fortune: during the larval stage, the area nibbled is 248.28cm2/one larva. That the nibbled area of leaves makes up 25 per cent of the total leaves on each tree has been determined as the index of control. As for old tree, the index of control was 4 larvae/ten pieces leaves. The relation between total leaves on each tree (y:cm2) and diameter breast-high (x:cm) is: y=10987.5281x1.2647.
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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 Preventive Threshold of Cryptothelea variegata

  • 1. Forest Pests and Diseases Control Station of Shanxi Province
  • 2. Northwestern College of Forestry
  • Received Date: 1990-01-10
  • Available Online: 2012-12-04

Abstract: Cryptothelea variegata Snellen harms leaves of Paulownia fortune: during the larval stage, the area nibbled is 248.28cm2/one larva. That the nibbled area of leaves makes up 25 per cent of the total leaves on each tree has been determined as the index of control. As for old tree, the index of control was 4 larvae/ten pieces leaves. The relation between total leaves on each tree (y:cm2) and diameter breast-high (x:cm) is: y=10987.5281x1.2647.

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