The patern and build up at edges makes it look like something evaporated leaving a white residue. Potassium silicate can do that.
Insect or bird shit? They can do that if you have a bird or two sitting around the bush or in a tree above it. They shit on leaves in just a few spots and it's not all the way washed off from rain storms. Might be more of a long shot but possible
Insect or bird shit? They can do that if you have a bird or two sitting around the bush or in a tree above it. They shit on leaves in just a few spots and it's not all the way washed off from rain storms. Might be more of a long shot but possible
saw something simillar 2 years in a row, on all plants...only smaller spots than yours...but same type...pale white with edges a bit harder...i was and still am confused with that phenomenon, because i know it wasnt any dryoff from anything...and i knew it wasnt mildew, because i saw alot of mildew...i know it wasnt birds...dont remember any other ideas that i had guessing what could it be, but i know i dismissed all of them based on facts...
never figured it out, but it never hurt plants...except maybe small percentage lower light absorption then it would be without these spots...