Research in Plant Disease 2005;11(2):208-212.
Published online December 30, 2005.
서해안 곰솔림에서의 리지나뿌리썩음병 발생 및 확산 유형
이승규, 김경희, 김연태, 박주용, 이상현
Occurrence of Rhizina Root Rot in a Black Pine (Pinus thunbergii) Forest Located at the Western Coastal Area in Korea and Its Spreading Patterns
Seung Kyu Lee, Kyung Hee Kim, Yeon Tae Kim, Ju Yong Park, Sang Hyun Lee
At the survey of June, 2002, total 294 dead trees were found in 20 ha of Black pine (Pinus thunbergii) forest located in the western coastal region of Korean peninsula. The dead trees were scattered over the 27 place as groups of about ten trees each. As a result of the field survey on the relationship between the conditions of dead trees and the occurrence of fruiting bodies of Rhizina undulata around the dead and/or dying trees, from June 2002 to August 2004 in the four plots, the occurrence of infected trees was observed as a shape of an irregular concentric circle from the first infected tree and R. undulata was found mainly around the dead tree. Because there was no observation of any other insects and pathogens which would kill trees, the cause of tree death in groups was considered owing to R. undulata. From the analysis of the physical and chemical properties of the soil collected from the damaged areas, the pH of soil was between 4.6 and 5.8 and the contents of soil nutrients were very low. Any "fire" trace was not found at all the 27 damaged places in the area, Taean, Chungcheongnam-Do, which are generally known as an important factor to initiate development of the disease. Therefore, further examination is needed to verify precisely about other environmental factors related with the group dying of the Black pines in this area beside "fire".
Key Words: Fire, Pinus thunbergii, Rhizina root rot, Rhizina undulata
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