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Leaf problem with autos in the flowering phase

Middleliferstarted grow question 4y ago

This started on my northern lights strain and I'm now getting it in my gelato plants that are close to done. Anyone know what this is? I'm growing in a tent, airpots, using fox farm soils and recharge is all. All plants are autos, they all seem to develop this in the last week's.

Middlelifer

Middlelifer

Middlelifer

Middlelifer

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Leaves. Color - Black or grey

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Coopmcanswered grow question 4y ago

https://www.bonzaseeds.com/blog/identifying-cannabis-plants-problems/amp/

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Coopmcanswered grow question 4y ago

Looks similar to phosphorus diffitency buy this chart

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Coopmcanswered grow question 4y ago

https://growlightinfo.com/rust-spots-on-leaves-during-flowering/

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Coopmcanswered grow question 4y ago

https://www.greencultured.co/blight-cannabis-diseases-when-growing/

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Middleliferanswered grow question 4y ago

I'm just using plain water the last few feedings, this all came on this past 2 weeks. I used calmag in mid grow to stop what i thought was a calcium problem. 2 feedings with that. Still this came on them. Thanks for all the input, I'll try to figure this out from all the comments

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AsNoriuanswered grow question 4y ago

Cold air or / and bad vpd ( check vpd chart for weed ) can cause issues with calcium absorption ... They love higher temps, target 25, makes magic with good RH , check by vpd what humidity you need for your stage. All the Best !!!

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AsNoriuanswered grow question 4y ago

Calcium issues, but if you have such leaves ... Are you using any root booster still ??? All the Best !!!

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Middleliferanswered grow question 4y ago

Temps are 75-80F humidity never over 35%. I'm pulling in dry cold air from outside and venting it outside as well. If that helps diagnose this problem better?

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Coopmcanswered grow question 4y ago

Also remove any infected leafs so they can’t spread it to I Nom affected leafs and plants

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Coopmcanswered grow question 4y ago

Rust or blight Kocide or any Copper Oxide fouler spray

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