Natter’s Notes Blister Mites: Grapes; Pears; Walnuts Jean R. Natter, OSU Master Gardener Blister mites are running wild this season. It seems that the perfect conditions combined for population explosions of these tiny, elongated mites which noticeably disfigure the leaves of grapes, pears, walnuts, and more. Among pears, even newly planted trees are victims. The … Continue reading Blister Mites: Grapes; Pears; Walnuts