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Boron defs are quite rare but I may sprinkle a little borax in the mix next time. It's happening only under the light, which makes me think higher intensity, faster metabolism with a potassium lockout. The brown blotches are weird though and it's mainly upper growth. I did notice a lower...

Leaf tips are crispy on some affected leaves but it's not light burn.

Last feed I gave them some calcium, potash, phosphorus, fish emulsion. A few plants aw showing this that are directly under he light. Maybe too much calcium locking out potassium?

Boom people, finally figured it out. My alfalfa might have been infected with this weed killer! watch out its nasty shit http://www.geologywales.co.uk/storms/summer-2011-aminopyralid.htm

http://www.theguardian.com/environment/georgemonbiot/2011/jul/15/vegetables-disease-aminopyralid-pesticide

Regardless of whether or not I can see them, I've sprayed with avid and it still spreads. I'm on agricultural land and have recently come to the conclusion that there may be a spread of the pesticide grazon/ aminopyralid aka weed killer. Trace amount some how somewhere, doesn't degrade for 3 years!

Can't find any russets. I fogged them with citrinella and geranium oil and neem. Just had to cut down another 3 that were toast. Roots are strong though. Here's so pics of the developing buds. You can see how the bud is already deformed.

No herms. I honestly think it's a reaction to the stress in the plant. It's gonna die so it freaks out and shoots seeds. I've looked into broad mites before and they really suck the color out of the new growth. Russet mites I looked into too but I never seen the vids you posted. They really...

I def think the plant is stressed because of all the seeds in the bud at harvest

Took about 2 cups of dirt from the base of the bed mixed with 2 cups of 0 tds water, stirred 210 tds. Yesterday I feed with 840 tds, then I hit them with a dose of plantacilin at around 400 tds. Even if you double the soil tds 420 shouldnt cause that ugly nasty leaf curl. IMO, It's not...

ya thanks for the reply anywyas

They are 24" tall, no Co2 in the affected room but i do have it in the other 2. I dont feed everytime with 2.0 EC just never over, usually around 640 tds.

Yeah i agree but why? Roots are healthy and white. Humidity 60 Temps 78-80. 6.0 Ph. Never over 2 EC. 2 feeds 1 water, even did 2 waters in a row last week after i ripped out the first half that started to curl. I will take 3 soil samples tomorrow from the bottom and see what ec is but i...

Yep looked into that as well about a year ago.

I think I would see a calcium or mag def in the lower leaves like rust spots and yellowing and the classic porassium def I've seen when running coco. I've honestly gone through everything. Curl shows up every time somewhere. I just cut this branch off the worst plant. Soon all the leaves will...

I appreciate the time youre taking to try and help me figure this out. Im in beds so when i say i take runoff, i take a sample of soil and do a slurry test. I have a bed lined with poly then a bed of perlite and then landscape fabric as a membrane on top as a filter, then my promix. So cant...

i bleached my whole room then ran my ozone machine in there on full blast for 24 hrs

Here's another pic with lights off. So when a plant curls it's stomata to the sun what is it saying? Trying to conserve water? Needs to sweat but can't?

Nah don't think so. That room has 1 fan and blows above the canopy. My environment is in check.

The plants that are affected right now aren't even directly under the light, they're inbetween and on the outside. VPD is in check I've been through that thread many times. The low EC does seem weird. Plants look healthy and dark green. I even noticed slight slight tip burn on a few but I...