The Q&A Archives: Hemlock Wooly Adelgid

Question: How do you Stop the Hemlock Wooly Adelgid? I learned what it's called by the Keystone Tree experts.

Answer: One possible treatment is the use of horticultural oil but the timing is critical in order for it to be effective. For a definite identification of the pest and the most up to date control measures recommended in your area, contact your local County Extension at 391-9840. Do this soon because this pest can kill a tree in just one season.

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