7 Weeks Flowering.. Need Some Help

Alright so I have another day or two until the res needs to be changed and over the past week I have noticed that my babies are experiencing some problems. The first picture is a leaf off of a pure sativa and the second leaf is off an indica. The temps range from 87 - 67 day and night. They are under 400W hps and the ph is around 5.5 (Aeroponics). The ppms are around 1200 give or take. At first I thought the second picture could be ph fluctuation but everytime I check the ph it is fine and hasn't flucuated. I haven't seen anything that looks like the first picture.... Can anyone help me? These problems are occuring mostly on the top halves of the plants with the bottom leaves starting to fall off due to almost time to harvest. Also, the plants that are with the second plant are also experiencing the same effects with curling leaves and graying areas.

I had some shit like that. Cal Mag fixed the problem. I don't think it will do too much for you at this point though.

Are your plants in soil? If it is it looks like to much Manganese in the soil so says the Cannabis Nutrient and Deficiency Table.

[FONT='Times New Roman','serif']MANGANESE (Mn)[/FONT][FONT='Times New Roman','serif'] Necrotic and yellow spots form on top leaves. Mn deficiency occurs when large amounts of Mg are present in the soil. Foliar feed with any chemical fertilizer containing Mn.[/FONT]

dude i got the exact same shit goin on right now. in prety much the same set up too, dwc though. Let me know if anything works for you plz!!!!!

here check this shit out International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

grossgumshoe said:

dude i got the exact same shit goin on right now. in prety much the same set up too, dwc though. Let me know if anything works for you plz!!!!!

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If your using R.O. water your lacking the trace minerals that are normally present. My problem occured after I stopped using tap water. Since then I use Cal Mag once during veg and once during flowering. Haven't had a problem since.

I too have had that problem in the past i corrected the problem by staying up on my ph