Stem injection / 'micro' injection
An insecticide is injected (via multiple small drill holes) directly into the trunk of the tree, the tree transports the chemical to the leaves where it kills the Elm Leaf Beetle and larvae.
We use a narrow diameter (micro*), slow delivery injector which is used only when the tree is naturally transporting water (when in leaf) this reduces the damage inflicted on the tree. We don't drill in winter as there is almost no natural transpiration and the force needed deliver the chemical increases the tissue damage and potential for decay.
Disadvantages - see notes on tree biology and tree injection
The primary defence mechanism for trees is the compartmentalisation of decay, or the shutting down of areas. The tree is effectively cutting off sections of themselves to try and contain the spread of disease. Every wound (drill hole) is a new section that must be cut off. Older trees are larger so they require more drill holes, also they are less successful at containing decay, particularly the movement up and down the trunk.
Phone: 03 8644 8005
ox, Casey, Lilydale,
Drilling / Injecting into trunks
Long term, the impact of injection / drilling into a trunk (sometimes called micro-injection) can be severe due to the structure of the tree and it's natural defence systems.
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