Overnight spots

[Rookieweeder]

Can anyone advise me what is happening to my plant. Literally overnight these dark brown spots showed up on my leaves. I was doing some pruning of bottom fan leaves and other low stress training,so was handling some the day before. Can you bruise the leaves????

 

[Californiakid]

Is there any pattern to it? I mean upper leaves? Or lower leaves? Both? Random mix? I ask because my grow room is not air conditioned and when I work in there on hot days I have to be careful where my sweat drops. My sweat discolors and dries out the leaf where it splashes. I'm guessing that I'm usually dehydrated and acidic.

Have you checked the sick plants forum or symptom checker?

Good luck

 

[ellz]

Hi Rookieweeder. It looks to me like a possible phosphorous deficiency. Here is an article on how to identify it and, more importantly, how to treat it if that is the problem: http://www.growweedeasy.com/phosphor...iency-cannabis

Another possibility is the dreaded fungus gnat: http://www.growweedeasy.com/fungus-gnats

 

[Californiakid]

Ellz may be onto something, now that he points out phosphorus deficiency. I think he may be correct.
I would certainly look into it. Good luck

 

[Speedygreen]

I agree. Likely phosphorus deficiency. I had 4 plants with it once. Fixed em with crushed up match heads disolved in water. I don't recommend doing that but it worked for me in soil

 

[Burny]

Is it an indoor or outdoor plant?

 

[alltatup]

Rookieweeder You're still in veg, right? Have you been checking your pH on a regular basis, and have you ever flushed the plants with just plain pH'd water for 48 hours?

If you are using the right cannabis nutrients, I say, IF, I would doubt that it's a deficiency. I would suspect problems with the pH and nutrient lockout. I had that happen to me and overnight all these nasty brown spots appeared on fan leaves. I flushed the plants for 48 hours, lowered the nutes dose I was giving them, and they bounced right back.