Research in Plant Disease 2010;16(1):101-105.
Published online April 30, 2010.
고추 탄저병균(Colletotrichum acutatum)의 분생포자 비산과 과실병반에 형성된 전염원 밀도
지형진, 신순선, 이지현, 김원일, 홍성준, 김용기
 
Conidial Disperse of the Pepper Anthracnose Fungus Colletotrichum acutatum and Its Density on Infected Fruits
Hyeong Jin Lee, Shun Shan Shin, Ji Hyun Lee, Won Il Kim, Sung Jun Hong, Yong Ki Kim
Abstract
This study was aimed to understand conidial disperse of the pepper anthracnose fungus Colletotrichum acutatum, elapse time for the disease development, and inoculum potentials on infected fruits. Most (99.2%) conidia of the fungus disseminated from inoculum source on the rainy day, while only 0.8% conidia dispersed on the sunny day. Among the conidia 93.3% were caught under 60 cm height at 30 cm distance; however, conidia were detected at 120 cm height at the distance. Relatively susceptible pepper fruits to anthracnose showed first visible symptoms at 4 days after infection under a mimic field condition. However, it seemed that over 10 days are required for the disease to develop on moderately resistant pepper fruits under unfavorable conditions. The number of conidia formed on a lesion was positively correlated with the lesion size (R2=0.88). Over 10 millions of conidia were formed at a normal lesion size 1.5 cm in length. In some large coalesced lesions ca. 4cm in length produced over 100 millions of the fungal conidia. Results further confirmed that the rainfall is the key factor for the inoculum disperse of the pepper anthracnose pathogen, Colletotrichum acutatum, and a long distance dissemination is plausible according to rain and wind intensity. Consequently, rain-proof structures are ideal to avoid the disease, and removal of infected fruits and timely chemical spray are indispensible to reduce the inoculum potential in the field.
Key Words: Colletotrichum acutatum, Conidia, Disperse, Inoculum


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