Physiological Incidences Related to Symptom Development and Wilting Mechanism
There are only a few wilt diseases of trees, and most of these are caused by fungi, for example Dutch elm disease, oak wilt, and blue stain disease of conifers (Sinclair et al. 1987). In contrast, pine wilt disease and red ring disease of coconut palm (Nowell 1919) are caused by nematodes. Despite a long research history, more than 100 years in some cases, there is no tree disease in which the wilting mechanism has been completely defined. In the case of pine wilt, the wilting mechanism has been relatively well defined. It would not be entirely true to say that the wilting mechanism of pine wilt is unexplained because some of the information remains hypothetical. This misunderstanding probably comes from the fact that the specific toxins directly inducing wilt such as cerato-ulmin in Dutch elm disease (Takai 1974) have not been identified in pine wilt disease. In this section a description is given of what is currently known about the wilting mechanism in pine wilt disease.
KeywordsAcoustic Emission Nile Blue Resin Canal White Patch Pine Wilt Disease
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