Elm leaves are double-toothed and often lopsided at the base.

The time to trim your oaks & elms are when the trees are dormant.

Do not burn elm wood, as the chemicals released from burning can also attract beetles.

Generally this is between October and February. The logic behind this being that if the sap is not running in the tree because it is dormant, the beetle is inactive due to dormancy and is not interested in the cuts! Nov 22, Trimming elms in the fall and in the winter is best to avoid sap leaking.

Elms are prone to rotting where large pruning cuts are made or poor puts are made so conservative trimming is best. In the parts of North America where Dutch elm disease is present, elms should be trimmed before bushfelling.barted Reading Time: 6 mins.