Dissemination of Conidiospores of <i>Colletotrichum gloeosporioides</i>, the Anthracnose of Persimmon and the Disease Development

Research in Plant Disease 2004;10(4):272-278.
Published online December 31, 2004.

감나무 탄저병균 Colletotrichum gloeosporioides의 분생포자 비산과 농가 포장에서 탄저병의 발생과정

권진혁¹, 박창석^*

경상대학교 농업생명과학대학, ¹경상남도농업기술원

Dissemination of Conidiospores of Colletotrichum gloeosporioides, the Anthracnose of Persimmon and the Disease Development

Jin-Hyeuk Kwon1, Chang-Seuk Park*

College of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, Korea
¹Gyeongsangnam-do Agricultural Research and Extension Services, Jinju 660-360, Korea

Correspondence: Chang-Seuk Park,Phone)+82-55-751-5442, Fax)+82-55-751-5439, E-mail)changpak@gsnu.ac.kr

Received: November 04, 2004

Abstract

The disease development of Anthracnose of sweet persimmon in relation to release of conida of Colletotrichum gloeosporioides were observed in a farmer's field located in Jinju from 1998 to 2002. The conidia started to release from early April and reached maximum in June to late July. The amount of conidia production reduced drastically from early August. The number of conidia trapped was closely related to amount of precipitation at the same period and number of new infections on the emerging branches and young fruits in orchard. The conidia released during the April was not effected to disease occurrence of persimmon tree but the spores produced from inoculum source after early May significantly important to the infection of the pathogen on emerging branch and this infection was directly related to infections on young fruits. Consequently the early infections on the branches brought severe occurrence of Anthracnose in the orchard. Most of the infected fruits were dropped in unripe state. The earlier infection caused the earlier fruit drop. The rate of fruit drop was reached up to 84.1% in August when the disease was occurred severely. Anthracnose of sweet persimmon also occurred in market shelf and storage warehouse. The anthracnose fruits are presumed to be infected while in orchard. Because the symptom formed on the fruit was too tiny to eliminate, the infected fruits were involved in storage boxes and anthracnose gradually developed in storage condition. The rate of diseased fruit observed in Jinju area were 1.2 to 1.6%.

Key Words: Anthracnose, Colletotrichum gloeosporioides, Conidia, Sweet persimmon