Help: looks like lines of rust

[Scamela2]

I hope someone can help me fast. I went out to my plants and in 2 days my cherry pie and candy land looks like the leaves have lines of rust.
Out door grow in Michigan
Using cal- mg
And just start to use Bloom nuits.
I know I don't have a pic but badit's bad, really bad. I flush them really good for 30 minutes each and applied a very weak solution of Thrive sprayed on the leaves.
Oh..Lordy something like this had never happened before therefore I am totally Perplexed.
So please anyone any help is definitely appreciated.
Tomorrow I will try to post a pic. I'm devastated...

 

[DthPch78]

Cannabis Plant and Pest Problem Solver - Pictorial

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www.420magazine.com

Maybe this will help hard to help without a picture

 

[Scamela2]

I'm truly lost!!
As soon as I see this rust looking lines i took a few leaves up to my grow store to show them. They to were as befuddled as myself. They look in the Bible of cannabis and came up with...nothing.
Ok thank you. But I will post a few pics today. Ok thank you off to look to see what comes close.

 

[Bush Doctor 77]

Welcome. Does this help?

 

[Scamela2]

Thank you, but unfortunately nothing looks like my leaves.
I am posting some pictures. I truly am at a befuddled.

8

 

[Scamela2]

Lost in my yard..this never happened.

 

[Scamela2]

Welcome. Does this help?

I hope you can see the pictures. I truly am nauseated about this. It is really bad on 2 plants. But on the other 4 plants they have just a really small, very small rust on the sides of some leaves.

 

[DthPch78]

U have a mild phosphorus deficiency and a pretty significant potassium deficiency
The white in your leaves is more of a problem to diagnose
Looks lik ph fluctuations which might be causing your other deficiencies
This is all i have hopefully someome with the right answer will ring in

 

[BeanTownFan420]

Did this happen after feeding flowering nutrients then its nutrient burn is my only guess.

 

[SmokingWings]

U have a mild phosphorus deficiency and a pretty significant potassium deficiency
The white in your leaves is more of a problem to diagnose
Looks lik ph fluctuations which might be causing your other deficiencies
This is all i have hopefully someome with the right answer will ring in

That seems like a good call based on the photos @Scamela2 posted and the chart @Bush Doctor 77 provided. The problem is more advanced than the chart but it really does look like it is a Potassium problem.

Scamela2, you mentioned you had an outdoor grow with plants, as in more than one or two. The marijuana plant is a very fast growing plant so it demands a lot of nutrients in a short time. If you have planted several plants to close together it is easy to create a problem. These fast growing plants could be demanding more than the soil can provide in a short growing time.

I am pretty sure that you will be able to help the plants out. Still a lot of growing time left in most of the state.

 

[GrizzWald]

Hopefully not... somebody used a herbicide near your grow?

 

[Bush Doctor 77]

What size pots are they in? Small pots can limit nute uptake.

 

[Scamela2]

Did this happen after feeding flowering nutrients then its nutrient burn is my only guess.

 

[bluter]

U have a mild phosphorus deficiency and a pretty significant potassium deficiency
The white in your leaves is more of a problem to diagnose
Looks lik ph fluctuations which might be causing your other deficiencies
This is all i have hopefully someome with the right answer will ring in

i'm with Dth. looks like it needs a pk booster. looks to start interveinal and then burn from edges inward. dunno how it can happen outdoor tho.

 

[Scamela2]

Yes it did happened after my 2 feeding.

I gave them Bloom nutrient from Hydroponics, Cal-mg, Nectar of the Gods and Molasses.
I watered them on Saturday and on Monday. Monday they were great, came back home on Wednesday and that's when I from my plants looking really bad.
I took a leaf up to my grow store but they had no clue and couldn't tell me why or even how to fix this mess.
I did a wicked flush on Thursday and I will do another today.
But I truly on lost when it come's to what I need to fix the problem.
It might be to late for my summer grow but still I would like to try. Every grow is definitely a learning experience.

 

[Scamela2]

What size pots are they in? Small pots can limit nute uptake.

They are in 15 and 20 gallons smart pots.

 

[Scamela2]

They are in 15 and 20 gallon

 

[Scamela2]

i'm with Dth. looks like it needs a pk booster. looks to start interveinal and then burn from edges inward. dunno how it can happen outdoor tho.

Ok..I am up to try just about anything just to see if it works. I believe it is to late to truly save them. So I'm going to chalk it up to a learning experience.
I'm glad I was not depending on this grow because...I don't even smoke cannabis. I love to grow it because they are just so damn awesome to grow. All my neighbors will be disappointed come Christmas, being I wont have there Christmas present for them.

 

[bluter]

Ok..I am up to try just about anything just to see if it works. I believe it is to late to truly save them. So I'm going to chalk it up to a learning experience.
I'm glad I was not depending on this grow because...I don't even smoke cannabis. I love to grow it because they are just so damn awesome to grow. All my neighbors will be disappointed come Christmas, being I wont have there Christmas present for them.

relax.. you are far from done yet. i would not give up.

i could be incorrectly seeing an excess as a deficiency or ph lockout as well... it's just the way that goes.
you've done a flush which is good as it can stop a lockout.

i'm in hempy, but i used to grow DWC and Promix style ( inert soil ).
in all 3 media, if i encounter something i can't figger i :

a) flush well to reset media
b) use h202 on the flush
c) reset nutes to what i reason is proper balance within 24 hrs of flush

that just about always catches it.

good luck. rooting for you.

 

[DthPch78]

Dont scrap it some people remove almost all of their fan leaves and they still get a harvest, so u had a few burn imo its not that big of a deal if u can get it dialed back in it will still produce