Strange Brown, Brittle Spots on Leaves

Discussion in 'Sick Plants and Problems' started by 420blackbird, May 28, 2006.

  1. We just started flowering in the closet about a week ago, switching from 400w MH to 400w HPS, 12 on 12 off. I have identified 3 of the plants as female, 2 as male. They have recently developed a strange problem in the lowest leaves. Certain small areas have turned kind of greenish brown and wilted in larger areas. Before long they become dry, crisp, and brittle. It also seems like it may be carrying over from one leaf to another where they touch. I tried clipping off the infected leaves, but more just get infected. I am worried that it will spread to the buds before they can be harvested!

    This could be unrelated, but it may be important. During finals, I neglected watering the plants for a couple of days and while I was at school they all (5) wilted down pretty badly. They went from like a 120 degree upreaching angle to a very acute 30 degrees or so. I immediately watered them and they perked back up within a few hours, but I think that may be about the time the problem started.

    Usually I water because one of the plants starts to wilt downward a little and I check its soil and it is mostly dry, but still somewhat damp at the bottom. I usually water anyway since I don't want the plant to wilt down any more. Am I overwatering?

    Are there any other possible explanations?
  2. No this is not a watering issue.
    When was the last time you fertilized, what type, and how much?
  3. I fertilize with every watering since the I started them blooming, about once every 2-3 days. I use FoxFarm Tiger Bloom solution 3 teaspoons per gallon, which is 2-8-4. It also contains Magnesium, Boron, Copper, Iron, Manganese, and Zinc. Is this too much nutrient? Too little?

    I tested the soil pH of one of the 3 pots, and it was around 6.3-6.9. I have been trying to water with a pH of about 5.7-6.3.

    Thanks for the feedback
  4. Your fert seems low in N for the veg phase. Maybe the N needs a boost. Piss in a bucket of it. Seriously, urea has now virtually replaced ammonium nitrate as the favoured N rich commercial fert.

    Also, some people only fert every other watering. I do two with, one without.
  5. Yes,
    Back off on the fertilizing a bit maybe every other watering and see how they react.

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