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Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (7): 128-133.doi: 10.11707/j.1001-7488.20220713

• Research papers • Previous Articles     Next Articles

Distribution Rule of Monochamus saltuarius Larvae in the Trunk of Pinus koraiensis

Yong Shi1,Lichun Fan1,Yanlong Zhang2,Jue Wang1,Yanan Zheng1,*   

  1. 1. College of Forestry, Shenyang Agricultural University Shenyang 110866
    2. Ecology and Nature Conservation Institute, Chinese Academy of Forestry Key Laboratory of Forest Protection of National Forestry and Grassland Administration Beijing 100091
  • Received:2021-05-09 Online:2022-07-25 Published:2022-11-03
  • Contact: Yanan Zheng

Abstract:

Objective: This study aims to provide a basis for scientific control, especially for biological control of Monochamus saltuarius, a newly discovered vector of Bursaphelenchus xylophilus in Liaoning Province, by investigating the damage characteristics of M. saltuarius. Method: Pinus koraiens trees infected by M. saltuarius were cut down and sawn into one-meter long segments from the base of the trunk. The bark was peeled off to record the number of invasion holes of M. saltuarius, then the wood segments were dissected to record the number of larvae. The diameter and water content of the wood segments were measured. The relationship between the number of invasion holes, the number of larvae and the height of the trunk were analyzed. The relationship model between the number of larvae and the diameter and water content of the trunk was established. Result: The results showed that the invasive holes of M. saltuarius mainly distributed in the trunk of 1-7 m above the ground. The number of invasive holes in the trunk of 6-7 m was the largest, with an average of 67.72 holes ·m-1, which was significantly different from the number of invasive holes in 0-1 m and 9-10 m. With the trunk height increased, the number of invading holes in the trunk of 7-13 m decreased first and then tended to stable. The larvae mainly distributed in the part of the tree trunk below 7 m height, and the number of larval at the trunk of 3-4 m was the largest (average 38.29 heads ·m-1). Larvae were relatively few above 9 m of the trunk, with an average of 11.50 heads ·m-1. The number of larvae in the trunk of 1-7 m was significantly different from the number of larvae within 9-13 m. The analysis results showed that the relationship between the number of larvae and diameter of logs was conformed to the model y=0.358 7x+6.115 4, and the relationship between the number of larvae and water content of logs was conformed to the model y=-74.155x2+96.209x. Conclusion: With the increase of the trunk height, the number of invasion holes of M. saltuarius increases first and then decreases, while the number of larvae generally decreases, and the number of larvae in the trunk is about 50% of the number of invasion holes. The correlation between the number of larvae and diameter of wood segments, and the correlation between the number of larvae and water content of wood segments were clarified. The results provide a basis for predicting the number of M. saltuarius in the trunk of P. koraiens, and then predicting the population density of M. saltuarius in the epidemic area, which could provide a reference for the scientific control of M. saltuarius that spreads Bursaphelenchus xylophilus.

Key words: Monochamus saltuarius, larvae, intrusive holes, Pinus koraiensis, distribution rule, trunk diameter

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