青苹果竹芋平脐蠕孢叶斑病病原菌的鉴定

Identification of the pathogen causing Bipolaris leaf spot on Calathea rotundifolia cv.fasciata

青苹果竹芋(Calathea rotundifolia cv.fasciata)又叫圆叶竹芋,属竹芋科,肖竹芋属,为多年生常绿草本植物。青苹果竹芋原产于热带美洲,如今作为小盆栽植物在广东省大量种植。竹芋种植生产中发生病害,观赏价值降低,造成经济损失。Chern等[1]在台湾发现Exserohilum rostratum可为害丽白竹芋(C.picturata),致使叶片产生褐色病斑。

A new leaf spot disease on Calathea rotundifolia cv.fasciata was observed in Guangdong,China.The pathogen of this disease was identified by pathogenicity,morphological characteristics and multi-gene sequences analysis of ITS,TEF and GAPDH.The result showed that leaf spot of C.rotundifolia cv.fasciata was caused by Bipolaris sivanesaniana.This is the first report of leaf spot disease on C.rotundifolia cv.fasciata caused by B.sivanesaniana.The results of host range determination showed that B.sivanesaniana could also infect Calathea veitchiana and cause leaf spot.This study will facilitate the timely detection and management of Bipolaris leaf spot.