Hi I'm new to gardening and some outbreak occurred while I was away for four days and I have no idea what it is. I feared verticulum wilt but this seems a bit broad, even for that disease (and grasses apparently are resistant or immune to it).
Affected plants+weeds:
Hog Plum (Prunus umbellata)*
various weed grasses
Spanish needles (Bidens alba)
Sweet gum sapling (possibly a maple but it looks more like sweet gum)
Various oaks
Various weeds at that spot I don't know the name of
Area is Northeast FL, few miles from coast. Area gets some shade but still enough light to qualify as full sun. Plants are all near a large brick wall covered in virginia creeper
*= plant I really care about/really want to save
Unaffected plants:
Pygmy Date palms
newly transplanted (a week or so ago) butterfly bushes, under/beside
hog plum
Some sort of evergreen viburnum bushes that came with the house (Sweet viburnum maybe?)
Ash saplings
A shelly sandbag broke and spilled in that location last fall because of a hurricane but there were no issues.
I was thinking fertilizer burn since I fertilized the butterfly bushes and tossed a few pieces at the hog plum (and have been watering them very thoroughly). However, the infected sweet gum is further away from that site and I dont think fertilizer travels 5+ feet unless it's a ridiculous amount? So I have no idea what it is.
It isn't drought damage because it rained while I was gone and the new and often very thirsty butterfly bushes are fine.
Whatever it is, on the hog plum it seems to be infecting lower branches more than upper branches and many are still green.
More pictures can be provided if needed but pic of the bidens leaf is basically what it looks like on everything.
Anyone have any idea what this is and how to help my plum tree? I've been googling but everything I find is either associated with cool wet springs (opposite of July in FL) or isn't found in all of these species. Any help is appreciated, I love my lil hog plum and don't want it to die
