What's killing my walnuts -- how to find help
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Walnut Council Bulletin. 37(1): 10-12.
For the last decade, we have watched as the granulate ambrosia beetle (GAB) formerly the Asian ambrosia beetle spread into the southern region of walnut. Now we are asked to watch for the possible invasion of the thousand canker disease (TCD) complex into the eastern United States assuming we cannot prevent its invasion from the western United States. For both pest problems, we need to watch our walnut trees for symptoms that include leaf flagging or yellow wilted leaves on one or more branches (also symptoms of several, less important problems), dead or dying branches retaining dead leaves, and emergence of epicormic sprouts on large branches and main stem.
Van Sambeek, Jerry; Juzwik, Jenny. 2010. What's killing my walnuts – how to find help. Walnut Council Bulletin. 37(1): 10-12.