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Recent wounds and the chemical scents they emit can actually attract insects that spread tree disease. An example is wounded elm wood which is known to attract bark beetles that harbor spores of the Dutch elm disease fungus. Open wounds on oaks are known to attract beetles that spread the oak wilt fungus. Take care to prune these trees during the correct time of year to prevent spread of these fatal diseases. Contact your local tree disease specialist to find out when to prune these tree species in your area. Usually, the best time is during the late fall and winter.