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Influence of water stress on development of pine wilting disease caused by bursaphelenchus lignicolus



Influence of water stress on development of pine wilting disease caused by bursaphelenchus lignicolus



European Journal of Forest Pathology 8(2): 97-107



The water status of Japanese black pine was investigated in relation to the population growth of nematodes in the wood. Decrease of oleoresin exudation flow was not related to the water status. The decrease was apparently due to the destruction of epithelial cells of resin canals by the nematodes. A leveling off in transpiration rates of pines in the field occurred in the summer and the decreasing transpiration rate increased disease incidence. Disease development was proportional to the period of leveling off in transpiration. Pines invariably wilted 2-3 wk after reduction of transpiration. At that time the number of nematodes amounted to several hundred per gram fresh wt of pine tissue. The population increases of nematodes in the wood are apparently directly influenced by water status. Changes of oleoresin exudation flow, transpiration and xylem water potential are discussed under the different water conditions in relation to the population growth of nematodes in the wood as the disease advances.

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Accession: 005695824

Download citation: RISBibTeXText

DOI: 10.1111/j.1439-0329.1978.tb00622.x


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