|Table of Contents|

Investigation on the Incidence of Cucumber Leaf Spot Disease and Its Biological Characteristics in Heilongjiang Province

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年21
Page:
7-14
Research Field:
Publishing date:

Info

Title:
Investigation on the Incidence of Cucumber Leaf Spot Disease and Its Biological Characteristics in Heilongjiang Province
Author(s):
ZHANG Di; LIU Qiyue; LIU Dong; TAO Lei; WANG Chunlong; ZHANG Yanju
(College of Agriculture,Northeast Agricultural University,Harbin,Heilongjiang 150030)
Keywords:
cucumber; Coryneform leaf spot; Corynespora cassiicola; distribution; biological characteristics
PACS:
-
DOI:
10.11937/bfyy.20194217
Abstract:
The occurrence of cucumber target leaf spot in Heilongjiang Province was investigated,the pathogenic fungus suspected of the disease were identified by morphology and molecular biology,and the identified strains of Corydalis leaf spot were used as experimental materials.The biological characteristics of pathogenic fungus were determined by colony growth method and glass slide method.The occurrence of cucumber leaf spot disease was investigated in the protected area of Heilongjiang Province,and the hazard symptoms in detail was described.The pathogenic fungus of the disease were identified by morphology and molecular biology.At the same time,the biological characteristics of the pathogen were determined by colony growth method and slide method.The results showed that the pathogen of cucumber rod leaf spot was Corynespora cassiicola (Berk & Curt) Wei.. The disease occured in Harbin,Qiqihar,Mudanjiang and other places in Heilongjiang Province.The optimum temperature for mycelium growth of pathogenic fungus was 25-28 ℃.The pathogen could make use of various carbon and nitrogen sources,mannitol was the best carbon source and glycine was the best nitrogen source.The optimum pH of 6-8 and the light were favorable for the growth of mycelia.The lethal temperature of hyphal was 55 ℃,with treating 10 minutes,the lethal temperature of conidia was 55 ℃,with treating 5 minutes,and the highest germination rate of conidia was at 25 ℃.

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Last Update: 2021-01-14