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Anthracnose Caused by Colletotrichum horii on Sweet Persimmon in Korea: Dissemination of Conidia and Disease Development
Author(s) -
Kwon JinHyeuk,
Kim Jinwoo,
Choi Okryun,
Gang GuenHye,
Han Sangjo,
Kwak YounSig
Publication year - 2013
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12096
Subject(s) - conidium , biology , colletotrichum gloeosporioides , spore , horticulture , colletotrichum , disease control , pathogen , botany , microbiology and biotechnology
Abstract Anthracnose disease caused by Colletotrichum horii ( C. gloeosporioides ) , results in considerable economic damage to sweet persimmon in southern K orea yearly. This study deals with the life cycle of the pathogen in terms of seasonal fluctuations of spore dispersal and the development of disease based on field surveys, spore potential and fungal isolation. Anthracnose disease was observed first on twigs in the last week of M ay and reached an incidence of 1.2%. Subsequently, the disease increased rapidly and reached an incidence of 86% by the end of J uly. Infection of fruits started in mid‐ J une (2.8%) and increased gradually to 64.4% by the end of J uly. In severely infected orchards, 46.2% of diseased fruits were dropped. The pathogen began releasing conidia in the first week of M ay and continued until the end of S eptember. The maximum release of spores was observed in mid‐ J uly. To determine the optimal use of chemicals for control of anthracnose, the following spray programme was evaluated. Spraying two or three times resulted in 89.4 and 93% control, respectively, whereas spraying more than four times led to 100% control. In comparison, the disease rate of unsprayed trees was 89.8%. To control anthracnose effectively, it is recommended to take steps to eliminate inoculum sources in sweet persimmon orchards before spraying chemicals.