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Norridgewock, ME(Zone 5a)

I have found what I believe are Adelgids on my larch tree (Larex decidua Pendula). The article I read suggests controlling with horticultural oil in the fall and winter. Is there anything I can do now? I have a lot of conifers and worry that it will spread.

Holland, OH(Zone 5b)

There are "summer" horticultural oils. Summer is a good time to treat adelgids when they are relatively unprotected.

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