Any portion of the roots which lead up to this streaking should be treated with herbicide to ensure death of the roots. Minimal damage will be sustained by adjacent elms. The elm wood itself contains very low levels of arsenic after treatment, although the wood at the points of treatment has higher levels. Therefore, all the wood except that at the points of treatment can be safely used. Wood that is burned would release arsenic at a rate comparable to that of burning coal.
Cacodylic acid has no registration in Canada.
Two injection herbicides are commercially registered for forests and noncrop land in Canada. These are administered into the trunk with a gun-like apparatus. More information on the action of these herbicides is required. Complementary Activities Saprophytic fungi which colonize dead elm wood can reduce the success of trap trees because the wood becomes less suitable to the bark beetles as breeding sites. This further emphasizes the need for beetle flight periods and herbicide treatments to coincide.