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Since the bark beetles usually limit their travel after hatching to 900 feet or less, all dying wood should be removed from that perimeter to deprive them of breeding wood. If left available to the beetles, any dying elm wood two or more inches in diameter could serve as beetle breeding wood.
“Supplemental spraying with methoxychlor can be given highvalue trees, or all ^sceptible elms, for protection against feeding by fungus-carrying beetles. Spraying without a sanitation program is of marginal value,” stated Weidhaas.
Often trees growing side by side intertwine their roots and develop natural grafts where liquids contaminated with fungus from a diseased tree infect a
88.8%