This showed up the day after a heavy Spinosad folier spray. I read Spinosad isn’t supposed to burn.
I noticed some browned tips.
Have not fed (doing Alaska Fish ferts) for over a week prior. Showed up on several plants at the same time. Doesn’t appear to be progressing. No beasties under the microscope.
Did you spray them while they were still getting sun? If so, that’s the culprit.
Any liquid on leaves goes on before the dark period over here.
It was early evening but there was some sun, yes.
Heavy spray + sun out = burns.
Also could be the calcium thing if your pots are constantly getting dried out.
Don’t spray spinosad outside if possible and definitely not during day light. It’s very bad for bees.
