Posible leaf seporia small plant

[JMD]

Problem: Yellowish spots on leaf of 2 out 5 plants

Medium/grow method: Soil + perlites

Feed: and supplements used:advanced nutrients conosseur + voodoo juice (stopped already)

water source:tap with carbon filter, quite hard with 400ppm but had already run a successful round with it without any issues

Strain/age:storm stomper 16 days

light used:cob cx3590 3500k x 2 + another generic 250w led with only grow switch turned on (more blueish light)

Climate:hot (25-31c and average humidity 45-65%

Additional info: 80cmx80cm grow tent, spots appeared a couple days ago, noticed in one plant and then in another... more 3 plants inside and seem OK by now. Some pics below. Thanks a lot for any help!!!

Have done some research and found step number 1 is to remove infected leaves but if I do so might end up killing the plant as there wont be many leaves left

 

[MesaBoogie]

sorta looks like what happens to the leaves on my plants if the led is to close. In the top pic at least. The bottom one I don't know. Little bit of the edge of the leaves curling up, but strange spots in middle. I'm no expert, but I'm sure one of the pro's will be around to give you a proper diagnose.

 

[Waira]

...not septoria, wrong symptoms.... top plant looks like early Ca defc.,... the other, hard to say, not distinct enough,.. it does look similar to what Mesa' suggested,... how far away are the lights? ..otherwise, it might be early P defc.,....

 

[Russell Nash]

Hello everyone. I live in Michigan and had rain on and off for 3 weeks. I had a 2fast2vast that was a week away from harvest and was hit by mold in the buds. I have a 2nd plant that has leaf issues. I will attach some pics. I thought it was a lack of potassium from so much run off from the rain. Have continued to feed RX green solutions A and B bloom plus Molasses. Any help would be great don't want to lose this girl

 

[wiltstone]

@ russell nash with all this rain your roots may have gotten affected. Don't over think it were going to dry out a little now. She wants to live as bad as you want to keep her alive. If it is the roots she will eat up her leaves till she can get her roots back in order. Do you use foiar spray?
@JMD I agree probably cal and P deficiencies, in days 14 thru 24 most strains can handle extra P in fact I think they really benefit from it. I think a little mag also its hard to tell when you aren't there, waira seems awfully good at it

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[Russell Nash]

...not septoria, wrong symptoms.... top plant looks like early Ca defc.,... the other, hard to say, not distinct enough,.. it does look similar to what Mesa' suggested,... how far away are the lights? ..otherwise, it might be early P defc.,....

This is a outdoor grow

 

[Russell Nash]

@ russell nash with all this rain your roots may have gotten affected. Don't over think it were going to dry out a little now. She wants to live as bad as you want to keep her alive. If it is the roots she will eat up her leaves till she can get her roots back in order. Do you use foiar spray?
@JMD I agree probably cal and P deficiencies, in days 14 thru 24 most strains can handle extra P in fact I think they really benefit from it. I think a little mag also its hard to tell when you aren't there, waira seems awfully good at it

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The top leaves are looking better, lower leave for the most part are gone even on buds.. I'm hoping that it will survive

 

[wiltstone]

At least were not in North Carolina

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