富贵菜青枯病的初步诊断

2005年,在广西现代农业技术展示中心首先发现富贵菜感染一种萎蔫性病害,此病对富贵菜产量影响极大,有的地方已暴发成灾。为了解病害发生情况,以便生产上有效控制其危害,作者通过田间调查、病原菌分离、纯化、致病性与寄主范围测定,证实了该病是一种维管束细菌性病害——青枯病,同时记录了该病的症状及其危害情况。该病原菌与茄科劳尔氏菌Ralstonia so-lanacearum(Smith)Yabuuchi等]至少有10种相同的寄主,其中富贵菜(Gynura divaricata)、少花龙葵(Solannum photeinocarpum)、当归菜(Angelica keiskei)、珍珠菜(Artemisia lactiflor)、紫背天葵(Gynura bicolor)、菊花脑(Chrysanthemum indicum)6种植物是茄科劳尔氏菌的新记录寄主。

The Preliminary Diagnosis on Bacterial Wilt of Gynura divaricata

Gynura divaricata belongs to the family of Compositae.A pathogenic bacteria was identifed as bacterial wilt by field investigation,pathogenic bacteria isolation and culture,and pathogenicity test on Gynura divaricata in morden agricultural technique displaying center of Guangxi in 2005.At least 10 same hosts were found between the pathogenic bacteria of bacterial wilt and Ralstonia solanacearum(Smith)Yabuuchi et al.,while the Gynura divaricata,Solannum photeinocarpum,Angelica keiskei,Artemisia lactiflor,Gynura bicolor,Chrysanthemum indicum were reported as six new hosts for Ralstonia solanacearum(Smith) Yabuuchi et al.Besides,the symptom,characteristic and development conditions of the disease were also studied in artificially cultivated Gynura divaricata.