Home Horticulture Information for the mountains of Western North Carolina
Tim, I've got two shorter hemlocks which can easily be sprayed. Based on the article you reference, it appears that I should wait until October before spraying with an insecticidal soap. Or would spraying occasionally before then do any good?Jim JankeMaster Gardener Volunteer
Spraying with insecticidal soap in October is recommended because there are no eggs present at that time of year and the soap is not very effective on the eggs. Spraying during the spring when the first generation of crawlers hatches will at least help keep populations down. The only concern with spraying during the growing season is that the soap can burn foliage if applied on very warm days. I have attached another link with additional control methods.
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