小麦孢囊线虫病瘿瘤密度对麦苗生长的影响

根据小麦孢囊虫病典型症状－根据部形成瘿瘤及其密度变化，探讨了该病害对小麦苗期生长影响，结果表明，瘿瘤密度与麦苗长势呈极显著负相关；瘿瘤密度在0．21－1．83，麦苗主茎高降低27．5％－45．4％，单株分蘖减少4．3％－77．0％，叶片减少7．9％－65．7％，次生根条数及根生分别减少1．3％－61．6％，8．0％－71．9％，瘿瘤密度达4．22以上时，麦苗不能形成分蘖和次生根，且弱小黄化严重而及早枯死。

Effects of Root Knot Density of Heterodera avenae Woll. Disease on Seedling Growth in Wheat

The cereal cyst nematode disease and its influence on seedling growth in wheat were studied in this paper.The typical symptom of the disease appeared that root knots(nematode gall)are formed at branching part of roots.The result of investigation on root knots caused by the nematode disease showed a highly significant negative correlation between root knot densities and seedling growth vigor in wheat.As root knot density gradually increased from 0 21 to 1 83,the height of main stem,length of roots,no.of tiller,leave and secondary root per plant have decreased by 27 5%-45 4%,8 0%-71 9%,4 3%-77 0%,7 9%-65 7% and 1 3%-61 6%,respectively.When the density reached 4 22 above,the seedlings becoming very weak and yellow can not produce tiller and secondary roots and died early.