Need help identifying leaf necrosis

Xcon

Active Member
Hi all, I'm currently growing some white widow from seed, and I'm having some problems. They're 9 weeks from sprout, flowering for 3. I transplanted into 5 gallon buckets of straight FFOF at 2 weeks and put them under a 400w MH to veg for 4 more weeks, giving them only tap water from a res and 1 drop per gallon superthrive.

I fed them Jack's classic nutes at flower, gave them a neem treatment, switched to HPS, (4 weeks after transplant) and towards the end of the first week they began showing nute deficiency. I properly diagnosed nute lock and flushed at the beginning of the second week until runoff ph'd at 6.7-6.8.

I gave the buckets a week to dry out, and I watered them again, runoff was back down to 6.1!?!? ...added lime, flushed them again, runoff 6.8, and still the problem was advancing. I picked up FF tiger bloom and nuted them 1 tsp per gal on tuesday, used ph-up to balance the water at 7.0, and the problem is still getting worse. Today begins week 4 of flower.

I've considered the possibility of mold, but it's affecting one plant very badly from top to bottom, and the other 2 only the bottom fan leaves. My RH is 55%, daytime temps are 75-78f. I lost my first grow to mites, and this is my second attempt. (bleached & wet vac'd my entire basement, fogged it, no-pest strip, neemed everything, installed an a/c, tend in my skivvies, the whole 9... no signs of mites yet but I'm ready if they do show) 1st pic 3 days ago, second pic today. 3rd pic is black shit all over my plant.
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Help me please!!.... Does anyone know if the Blueberry Cheese NORMALLY has stripped purple stems and purple fan leaf stems? I am showing some Necrosis appearance on my fan leafs only. (rusty brown patches between veins,slight tip and edge curl up, no yellowing) Plants are at 4 weeks from clone...I am using RO water..6.6 raw ph 20 ppm....Added GH "grow" 1200 ppm adjusted ph 5.8...Using Rockwool....Flood and Drain....every 3 day watering.. 18-6 hrs.....75-85 temp 65% rh They are about 14'' tall... Should I just flush with the raw RO water? I just watered yesterday....or wait? OR get it flushed up and half nute the rest until I start them into flower....Need your help guys.....cant find the Blueberry Cheese photos anywhere! My Purple Diesel has no issues....Same nutes ditto... Thanks
 
google plant fungus. could be Cercospora beticola of anthracnose or one of the others. Serenade cures most of the diseases. GL
 
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