桃树根结线虫生物学特性及防治

Biological Characters and Control of Peach Root-Knot nematode

桃树根结线虫以卵和二龄幼虫在虫瘿和土中越冬。二龄幼虫在冲积土和紫色沙壤土中主要分布于０～５０ｃｍ土层，粘壤土则集中分布于０～３０ｃｍ土层；线虫量及垂直分布深度，冲积土＞紫色沙壤土＞粘壤土。二龄幼虫量的周年消长出现７个高峰，以３月底第５个高峰的虫量最大。用４５℃、５０℃恒温水或用有效成份为０．１％、０．０５％铁灭克、克线磷或呋喃丹浸根。

he eggs and second-instar larvae of pear root-knot nematode hibernate in galls and soil The second instar larve mainly distribute in the soil layer at a depth of 0-50cm in alluvial soil and purple sandy loam soil;and 0-30cm in clay loam soil.The rank of the amount and the depth of vertical distribution for this nematode in the three types of soils are:the alluvial soil>purple sandy loam soil>clay loam soil.The second-stage larve have 7 peaks within a year.The densest population occures at the fifth peak at the end of August.The result of control test showed that soaking the peach roots with nematicides(01% or 005% of Aldicarb,Fena-miphos or Carbofuran) were effective.An available method to reduce the pathogen's (Meloidogyne javanica) damage was found by soaking the peach sprout roots in water at a constant temperature of 45℃ for 25 min.or 50℃ for 15 min.