Dutch elm disease was not only transmitted via the root grafting of infected roots to healthy root systems, but it also had a very efficient vector, the European elm bark beetle. The sap beetle (family Nitidulidae), though identified as a successful vector of the oak wilt fungus, is not nearly as efficient. ... And, if a devastating insect or disease problem is introduced, then the losses are much less expensive and easier to ... PAGE 4 THE WISCONSIN ARBORIST I November-December 2005.
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