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Rusty Leaves
Goenndalfstarted grow question 4 years ago
3 upper fan leaves have "rusty" brown spots on the upper side. Hard to spot, hard to capture on camera.
I also have slight "clawing" on many of the upper leaves.
Mg/Ca lockout because of nitrogen toxicity possible?
Doesn´t seem to be fungi, as there are no spores to rub off.
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Harmaranswered grow question 4 years ago
Yes, it is magnesium blocking. Spray magnesium sulfate over the leaf every three days, three times.
Lionsshareanswered grow question 4 years ago
I am having a similar problem on 2 strains leaves curling in with brown rust like spots I am trying raising ph to 6.3-6.5 hopefully they absorb more calcium I’m using 6ml calimagic per gallon I will let you know if that helps any. I’m going to remove damaged leaves and see if anything new comes up. 👍🌱
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