I've had this problem since nearly the beginning of the grow and can't seem to get it worked out - I'm in week 5-6 of veg and it's getting worse. Lower leaves seem to be more affected than upper.

I'm growing white widow from seed in a dwc/bubbler setup (good airstones and pumps)
1.5 " rockwool cubes (now dry) in meshpots with clay pellets
Distilled water, changed every 1-2 weeks, nutes at 500 ppm
temps max at low-mid 80s daytime and min in the high 60s-70ish at nighttime.
230 watt HPS 18/6 (with four 24" agrosun vertical flouros along the sides)
pH 5.7-6.0
humidity 20% (best I've managed - I live in a near desert)
4 plants in an 8 gallon reservior - each plant has the problem
I've examined the leaves with a loop and have seen no bugs

The nutrients are kind of old - I'm using Dynagrow that I bought about 4 years ago. I'm wondering if some of the nutes have locked due to aging. I really don't know if that even happens or not....

This is my 3rd grow - 1st with WW. The first grows (Blueberry, C99) were successful and uneventful. Any advice is appreciated!
cosmas Reviewed by cosmas on . Help! I'm almost out of weed and the leaves on my resupply grow look like this! I've had this problem since nearly the beginning of the grow and can't seem to get it worked out - I'm in week 5-6 of veg and it's getting worse. Lower leaves seem to be more affected than upper. I'm growing white widow from seed in a dwc/bubbler setup (good airstones and pumps) 1.5 " rockwool cubes (now dry) in meshpots with clay pellets Distilled water, changed every 1-2 weeks, nutes at 500 ppm temps max at low-mid 80s daytime and min in the high 60s-70ish at nighttime. 230 watt HPS Rating: 5