植物根腐线虫病的研究——Ⅲ.麻根腐线虫病病原鉴定

 1986以来,先后调查了湖南沅江、江西宜春、九江、永丰及奉新、安徽芜湖及萱城、浙江临海和广西桂林等市(县)的苎麻根腐线虫病,鉴定了苎麻根样32份及其土样32份。除江西奉新县外,在其它各市(县)都查到同一短体线虫,带虫根样和土样分别占供检根样和土样的63%和66%。根据这种线虫的测量值和其雌虫唇环2个、后阴子宫囊较长(22-52μm)并可分化以及雌虫尾端常平(斜)截或有时出现一凹痕等形态特征,鉴定为咖啡短体线虫Pratylenchus coffeae (Zimmermann,1898)&Filipjev Sc-huurmans Stekhoven,1941。它与过去国内报道该病的优势病原即穿割短体线虫Pratylencbus pene-trans (Cobb,1917) Filipjev&Schuurmans Stekhoven,1941不同。

STUDIES ON PLANT DISEASES CAUSED BY LESION NEMATODES Ⅲ. PATHOGEN IDENTIFICATION OF RAMIE ROOT ROT DISEASE CAUSED BY LESION NEMATODES

Field investigations on ramie root rot disease caused by lesion nematodes in China from 1986 to 1987 indicated that 63% of the 32 root samples and 64% of the 33 soil samples around roots of ramie[Boehmeria nivea (L.) Gaudich] collected from some localities of Hunan,Jiangxi,Anhui,Zhejiang,and Guangxi were infested with the causal organism.All the lesion nematodes isolated from the samples mentioned above were identified as Pratylenchus coffeae (Zimmermann,1898) Filipjev & Schuurmans,1941.They are not only similar in measurements but also identical in morphological characteristics,especially in lip with 2 annules,posterior uterine sac relatively long and often differentiated,female tail usually truncate and with a smooth terminus,lateral field with 4 incisures and male common.This result is different from that of the previous reports ^[2-5] in which Pratylenchus penetrens (Cobb,1917) Filipjev & Schuurmans Stekhoven,1941 was considered as a major species of causal organism.