on wild plum tree
Right next to Taraxacum officinale: https://www.inaturalist.org/observations/164678353
On Polygonum sp., I believe Polygonum buxiforme. I say "believe" because I've previously observed both P. aviculare and P. buxiforme in my yard and I've not yet bothered to key out any of the Polygonum spp. this growing season.
This is part of a series of observations from the same area:
There are several other knotweed plants in other places in my yard that appear to be effected by this same pathogen too. The Fallopia sp. in my yard also appears to be effected by some sort of pathogen. See https://www.inaturalist.org/observations/223604355. The Persicaria sp. in my yard does not appear to be effected by any pathogens.
Insect on Achillea millefolium. Plant is not wild and is planted in a yard.