rust on leaves?

on my little ones still in veg. theres a substance appearing on the leaves that looks like rust has this ever happened to anyone:wtf:

can you post up some pics? :smokin:

Pics and conditions, especially soil runoff pH or res pH if in hydro. Fill out the troubleshooting form and post the info. It's at teh top of the section.
K def is a likely suspect for a rusty appearance. Common in wet, acid soils.

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Originally Posted by stinkyattic

Pics and conditions, especially soil runoff pH or res pH if in hydro. Fill out the troubleshooting form and post the info. It's at teh top of the section.
K def is a likely suspect for a rusty appearance. Common in wet, acid soils.

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I've also understood that a P overdose can look alot like a K def.. what do you think?

Without any more info it's hard to say anything for sure though.

Quote:

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Originally Posted by BobBong

I've also understood that a P overdose can look alot like a K def.. what do you think?

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I think that the P overdose actually causes K def by 'locking it out' and making it unavailable to the plant. You will also see scorched leaf tips if you are creating overfert lockout conditions. In a pH lockout condition, these may not be present.