You can't see them little buggers. But they are there. We had a tree company (Bartlett Tree) come last fall and they not only sprayed but thinned out the dead branches and the trees look marvelous this year. We lost one of the Hemlocks and had to cut it down.
They told us we need to spray twice a year, but we only did it last fall. I wish I would called sooner and maybe it would have saved the tree we cut down.
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