I have a lot of yellowing of leaves on the lower inner of the plants. I am constantly battling PM and can only think that it is the problem but now i see a bit of a different look to some of the leaves. I am still using GH useless formula with calmag. It isnt all of them but it is the ones that had the PM the worst before i sprayed with Dupont fontellis. Now it is like i am getting the PM damage but not seeing the white powder and some leaves look to me like a phosphorus deficiency but that should not happen with the useless formula PH is 6.4 at fresh mix and 6.1 if it sits for a day. This is the look that looks like P deficiency but i am wondering if PM could do this
Doesn't pm soltions change the ph of the leaf? i thought that is the mechanism that actually kills the pm.