Boxelder pouchgall mite
Aceria negundi (boxelder pouchgall mite). Formerly Eriophyes negundi. Rose Tree Park, Media, PA.
Aceria triplacis gall
Aceria triplacis (formerly Eriophyes triplacis) gall on white oak. Often misidentified as Taphrina caerulescens (an ascomycete fungus). Hildacy Preserve, Media, PA.
Poison ivy leaf mite
Poison ivy leaf mite (Aculops rhois). Taylor Memorial Arboretum, Wallingford, PA.
Mulberry leaf spot
Mulberry leaf spot (Cercospora moricola). Springfield, PA.
Spider mites
Spider mites (Tetranychidae) on yellow chrysanthemum. Longwood Gardens, Kennett Square, PA.
