木薯新发藻斑病在中国的发生调查及病原鉴定  

Survey and Pathogen Identification of a New Algae Spot Disease on Cassava in China

作　　者：陈奕鹏[1] 时涛[1] 蔡吉苗[1] 李超萍[1] 李博勋[1] 黄贵修[1] 

机构地区：[1]中国热带农业科学院环境与植物保护研究所农业部热带作物有害生物综合治理重点实验室海南省热带农业有害生物监测与控制重点实验室,海南海口571101

出　　处：《热带作物学报》2016年第9期1787-1792,共6页Chinese Journal of Tropical Crops

基　　金：国家木薯现代产业技术体系建设项目(No.CARS-12-hnhgx)

摘　　要：2010～2015年,笔者在对中国木薯主栽区的病害调查中发现了一种新的叶斑病。该病在云南、海南、广西、江西、福建等地区均有发生,生长中后期爆发流行,初步分析低温是该病成灾的关键因子。病原在叶片上形成黄褐色或黑褐色、近圆形、中央灰白色毛毡状的病斑,发病叶片大量脱落,严重影响木薯的长势和产量。对来自不同地区的病样进行显微观察。结果表明：病原在寄主组织上均形成有隔的孢囊梗,单生或丛生,其上着生数个圆形、黄色的孢子囊,表明其为寄生性头孢藻。From 2010 to 2015, one kind of new leaf spot disease was firstly found during the cassava disease survey which was carried out on the main planting regions in China. The disease was widely happened in Yunnan, Hainan, Guangxi, Jiangxi and Fujian provinces, serious happened at the mid-late growing stage of cassava. The preliminary analysis results showed the low temperature was one of the key occurrence factors. The yellow or black brown, roughly circular lesion with gray and velvety in the central area was emerged on the leaves, lots of disease leaves were dropped off in advance, and the plant vigor and yield were all plunged. Microscopic observation of the disease samples collected from different regions showed the septate sporangiophores were solitary or in tufts formed on the host tissue, several circular, yellow sporangia was produced on the top, and the results were identical to the descriptions of Cephaleuros virescens Kunze.

关 键 词：木薯 藻斑病 头孢藻 低温 

分 类 号：S533[农业科学—作物学]