Soil injections to treat Elm Leaf Beetle should be undertaken in late winter/early spring. The exact timing will be dependent upon the environmental conditions of the area (particularly temperature) however should be done when it is noticeable that the tree is emerging from its winter dormancy e.g. the swelling or opening of leaf and/or flower buds. This is a sign that the tree’s root system is active and is therefore capable of absorbing water and mineral nutrients.
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