›› 1987, Vol. 23 ›› Issue (zj2): 54-60.
• 研究简报 • 上一篇 下一篇
赵秉义 赵铁良 赵石峰
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Zhao Bingyi,Zhao Tieliang,Zhao Shifeng
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Abstract: The relationship between damage degree and yield reduetion of Small poplar borer was studied in Yanbei of Shanxi Province.The results Show that high growth of poplar tree is reduced by 17% because of top damaged.The percentage of top damaged in forest can be determined by the borer nutuber per twig and the wood volume losses is estimated by the gall number per twig.The economic threShold for the Small poplar borer iS established respectively on the basis of high growth reduction and wood volume losses in poplar plantation.According to the benefit cost analysis,the economic threshold for high growth reduction and wood volume losses is respectively,9,16,23,30,39,47,57 borer per tree and 19,32,49,66,84,103,123 gall per tree for 2-8 years poplar plantation.
赵秉义 赵铁良 赵石峰. 山西雁北青杨天牛经济阈值的研究[J]. , 1987, 23(zj2): 54-60.
Zhao Bingyi;Zhao Tieliang;Zhao Shifeng. STUDIES ON ECONOMIC THRESHOLD FOR SMALL POPLAR BORER SEPERDA POPULNEA IN YANBEI OF SHANXI PROVINCE[J]. , 1987, 23(zj2): 54-60.
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