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Scientia Silvae Sinicae ›› 1999, Vol. 35 ›› Issue (6): 71-75.

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A STUDY ON THE RELATIONSHIPS BETWEEN OCCURRENCE OF ARMAND PINE BARK-WEEVIL(PISSODES YUNNANENSIS LONGER) AND ENVIRONMENT

Zhonghe Zhang1,Kaili Xie2,Kuiguang Cao2   

  1. 1. The Research Inst itute of Resources Insects of Chinese Academy of Forestry Kunming 650216
    2. Southwest Forestry College Kunming 650224
  • Received:1998-06-29 Online:1999-11-25 Published:1999-11-25

Abstract:

This study, on one hand, researched into the relation between occurrence of armand pine bark-weevil and envromental factors and on the other hand, it also carried out an exploration to grading of damaged trees, spatial distribution pattern of pupa and smapling technique.The results demonstrate that the trees damaged by the armand pine bark-weevil can be graded into 4 levels :normal, primarily infectious, nearly withered, and withered.All the spatial dist ribution patterns of pupa are aggressive dist ribution, the best sampling position is the foot of tree, and under 99% reliability, the environmental factor which has major influence on the number of armand pine bark-weevil population is growing potential of trees.

Key words: Armand pine bark-weevil, Spatial distribution pattern, Sampling technique, Environmental factor, Population density