Horticultural Oil Spraying: The Hemlock Woolly Adelgid

Hemlock trees are not only an important part of the natural forest and an essential resource for the timber industry, but they are also a great ornamental addition to residential landscapes. The small aphid-like pests called Hemlock Woolly Adelgids are an invasive species that are a danger to hemlock trees. Horticultural oil spraying is often …

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