The Effects of Compensation and Extra Compensation of Larix olgensis for Needle Pests Injury
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1.
Department of Agronomy,Jilin Agricultural University,Changchun 130118,Jilin,China
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2.
Forestry Academy of Jilin Province,Changchun 130033,Jilin,China
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Received Date:
2004-10-12
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Abstract
In 1990—1995,the compensation and extra compensation effects of 6～12 years old larch(Larix olgensis) to needle pests,including the fungi: Mycosphaerella larici-leptolepis and Triphragmiopsis laricinum and insects: Coleophora obducta,Dendrolimus superans and Pristiphofa erichsonii,were tested by adopting artificial defoliation of needles and analysis of growth volumes of larch in May,June,July and August.The monthly regress models reflecting the relationship between injury amounts of needles and growth volumes losses were established.The injury levels of the needle pests corresponded to compensation point or extra compensation point were calculated.The results showed that the injury below compensation point or extra compensation point could increase larch growth better.Thus,the EIL of larch pest should be a trifle raise up.
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