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http://dx.doi.org/10.5423/RPD.2005.11.2.208

Occurrence of Rhizina Root Rot in a Black Pine (Pinus thunbergii) Forest Located at the Western Coastal Area in Korea and Its Spreading Patterns  

Lee, Seung-Kyu (Division of Forest Insect and Disease Pest, Korea Forest Research Institute)
Kim, Kyung-Hee (Division of Forest Insect and Disease Pest, Korea Forest Research Institute)
Kim, Yeon-Tae (Institute of Forest Protection & Management)
Park, Ju-Yong (Division of Forest Insect and Disease Pest, Korea Forest Research Institute)
Lee, Sang-Hyun (Division of Forest Insect and Disease Pest, Korea Forest Research Institute)
Publication Information
Research in Plant Disease / v.11, no.2, 2005 , pp. 208-212 More about this Journal
Abstract
At the survey of June, 2002, total 294 dead frees 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 proper ties 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'.
Keywords
Fire; Pinus thunbergii; Rhizina root rot; Rhizina undulata;
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