›› 1985, Vol. 21 ›› Issue (2): 210-215.
• 研究简报 • Previous Articles Next Articles
Chen Taoyuan
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Abstract: The effect of Dendrolimus punctatus Walker caused defoliation on the growth of Pinus massoniana Lamb and Pinus thunbergi Parl is studied. A empirical formula is derived;management index=larvae density when 50% crown totally defoliated/6.83 It is not nesessary to make a control decision until the larvae density per tree exceed the management index. A atable based on a significant coefficient between breastheight diameter and foliage biomass is shown.From this table,one can find out the management index conveniently if only he measures the breastheight diameter of tree.
Chen Taoyuan. A PRELIMINARY STUDY ON THE MANAGEMENT INDEX FOR DENDROLIMUS PUNCTATUS WALKER[J]. , 1985, 21(2): 210-215.
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