山药根腐线虫病的病原鉴定和致病性研究

PATHOGEN IDENTIFICATION AND PATHOGENICITYOF THE CHINESE YAM ROOT ROT DISEASECAUSED BY LESION NEMATODES

田间调查、形态鉴定和人工接种试验证明我国一种由咖啡短体线虫（ｐｒａｔｙｌｅｎｃｈｕｓｃｏｆｆｅａｅ）引起的中药材新病害——山药根腐线虫病。该病在江苏沛县普遍发生，侵染山药的根系和块茎，田间发病率为３０％～１００％，产量损失高达３０％～５０％。本文还对该病的症状和病原形态进行了系统描述。

A new disease-the Chinese yam (Dioscorea batatas Decne) root rot diseasecaused by lesion nematodes was described in detail after field investigations and sys-tematic pathogenicity tests carried out from 1987 to 1990. The causal nematode wasidentified as Pratylenchus coffeae (Zimmerman, 1898) Filipjev & Schuurmans Stek-hoven, 1941 This disease was common and very serious in Pei County, Jiangsu pro-vince, with high root incidents of 30%～100%. The roots, tubers, rhizoma andyoung buds were all infected and showed different degree of necrosis and rot. Above-ground symptoms were usually in the form of stunting, colorosis and eventual death.