Brown spots help

[MATESSSX]

Hello, this showed up on my plants. Once I've feed them by light solution of nutrients on leaves by sprayer, can't be that? Also my other plants are ok in same conditions.

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[MedGrower]

List of questions:
So this is affecting only the top leaves of the plant?
What kind of solution did you spray?
Did you have lights on after the sprayings?
What kind of lights and how close they are from the canopy?
What feed to you have to your plant?
Have you measured the pH of the soil?
Can we have picture of the overall plant?

Cannot really give a reliable answer due to lack of information at this point but with given information it sure sounds like the spraying did just burn the leaves. It can sure do that as the water droplets that accumulate on the leaves acts as focusing lenses to the light to burn the surface of the leaves. Personally I do not do any foliar spray anymore, haven't noticed improvement and most I've managed is something similar to this: Burned spots on the leaves. So for now, if everything else is ok. Feed is ok and pH is ok you should just lay back the spray and let her heal up.

This could be also light burn if you have light really close to the canopy. Symptoms resemble potassium defiency but I think those symptoms should start appearing from the bottom first along with some yellowing. If these symptoms do not affect the bottom leaves, I would suspect the light burn, due to spraying + lights on or lights too close to the plant.

Do not take my "advice" as a definate answer. Someone more exprerienced may have a different opinion. These are just my thoughts based on my experiences. Good luck!

 

[MATESSSX]

Info : sprayed them with 0,5ml of bio thrive general organics in evening no sun.. . They are growin outside on balcony. Pretty stable close to 30°c bit windy. They are Dutch passion auto ultimate eight week. Here is sick plant and her healthy sister

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[namvet25]

Have you been using all organic nutes?Also have you given them any cal/mag?

 

[MATESSSX]

Have you been using all organic nutes?Also have you given them any cal/mag?

No calmag solution, nutes are 100%bio

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[namvet25]

Try using some cal/mag and see if that helps.

 

[derek420colorado]

I think it is a calmag def more a mg than ca though

 

[Waira]

Mate', I think this is a more uncommon symptom of K deficiency,... other, lower leaves look more typical, with the burned margin tips... The foliar spray isn't a part of this,... organics are generally mild nutes (you have GO Box nute's?), and as such can come up short in demand during bloom,.. She looks healthy otherwise, and pH needs to be really far off (acidic) to lockout, so most likely she's just having a lack-of defc.,... up the bloom dosage, or apply a stronger bloom booster (high P K) and see is this stops progression of symptoms.... Seems odd that the others are fine, but early mild K defc. doesn't show symptoms right away, plus, each pot becomes it's own little ecosystem, so even with the same feeds/schedule, things can still drift into trouble as individuals,... I'd start some Ca-mg anyway, as demand for those is increased as well at this stage-- prevention!

 

[derek420colorado]

Mate', I think this is a more uncommon symptom of K deficiency,... other, lower leaves look more typical, with the burned margin tips... The foliar spray isn't a part of this,... organics are generally mild nutes (you have GO Box nute's?), and as such can come up short in demand during bloom,.. She looks healthy otherwise, and pH needs to be really far off (acidic) to lockout, so most likely she's just having a lack-of defc.,... up the bloom dosage, or apply a stronger bloom booster (high P K) and see is this stops progression of symptoms.... Seems odd that the others are fine, but early mild K defc. doesn't show symptoms right away, plus, each pot becomes it's own little ecosystem, so even with the same feeds/schedule, things can still drift into trouble as individuals,... I'd start some Ca-mg anyway, as demand for those is increased as well at this stage-- prevention!