苹果短粗根病的发生及病原线虫种的鉴定

INCIDENCE OF APPLE STUBBY ROOT DISEASE AND SPECIES IDENTIFICATION OF PATHOGENETIC NEMATODES

本文首次报道了苹果上的新病害——短粗根病:根系团状,侧根丛生,黑褐色,短、粗,尖端钝或稍膨大,无根毛,无吸收功能与活力。地上部生长衰退,枝条生长缓慢,产量低,重者枯死。该病发生在北京市南口农场,经诊断为巴基斯坦毛刺线虫(Trichod orus pakiatanensis Siddiqi,1962)所致。病原线虫主要形态特征是雄虫具3个颈乳突、三个腹乳突和一对尾乳突,交合刺有环纹;雌虫有一对体侧孔。

The stubby root disease of apple caused by Trichodorus pakistanensis Siddiqi, 1962 occurred in Beijing. The disease showed typical symptoms of stubby roots which caused the nonproductivity of more than 7 acres of the old orchard. Apple trees infected by this nema-tode seriously declined or died.