Yellow spots on leaves

Help for sick or damaged marijuana plants. Marijuana growing pests, diseases, nutrient problems.

Yellow spots on leaves

Postby sextus_maximus » Sat Nov 13, 2010 6:14 am

I am new to growing and have some plants a friend gave to me. They are still in Veg state under 600W lamp. They are about 6 weeks old (I think). The room is at 75 degrees. I have to water about once every 5 days. There is a fan and air filter/purifier in the room. The pH level is at around 7-8. The pH meter is a little crude though.

I use Rhizotonic and Bio Vega (Canna products) as recommended by my friend. I apply the recommended amounts per instructions. I allow the water temp to aclimatize also.

I have yellow spots on the leaves as shown. Some of the tips are curling downward also. Would appreciate some advice here.

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Yellow spots on leaves

Postby jimmy_pop » Sat Nov 13, 2010 2:27 pm

What medium are you using? Bio Terra plus? Its my understanding that with that line of soil and nutes there is no need to worry about ph, the nutrients are mineral based and available directly to the plant at all ph levels. So I doubt its a ph issue. How big are the plants physically? Can you get us a shot of the entire plant? It could be that the plants are still fairly immature and your your getting some nutrient burn. What kind of air exchange do you have set up? If theres not enough air exchange its possible to get some burn like that. Thirdly and the most likely IMO 5 days seems a little long in between watering unless the plants are small and immature, how are you deciding when its time to water? Best gauge Ive found is to take your finger stick it and inch down if its dry its time to water if its wet leave it be. Best of luck too you.
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Yellow spots on leaves

Postby Lady Zandra » Sat Nov 13, 2010 7:03 pm

Looks like splash-burn...
are you moving or turning OFF the lights when you spray?

If not-- each drop of water/solution on the leaf acts like a little magnifying glass and burns a nice round spot on the leaf till it dries.
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Yellow spots on leaves

Postby 163 » Sun Nov 14, 2010 9:25 pm

i was just thinking the same as Lady Zandra
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Yellow spots on leaves

Postby cman8633 » Thu Dec 30, 2010 11:46 am

I'm having the same problem, although mine isn't splash burn cause I haven't sprayed my ladies with anything. But the day before yesterday I started feeding them nutrients. I waited 3 weeks though, and I also follow the measurement instructions. Could there be any other reasons?
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Yellow spots on leaves

Postby mrniceguy » Sat Jan 01, 2011 9:23 pm

I have recently had yellow spotting on outer edges of leaves but was able to correct with calmag. Didnt look like pics from the OP, they were right on the edges of the leaf margins. Noticed this was an old post, were you able to identify and correct the problem
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Re: Yellow spots on leaves

Postby Jgb0808 » Fri Jan 03, 2014 3:55 am

I just noticed this spot on one of my ladies and it's kind of scaring me because I have never seen spotting on any of my babies before, can anyone tell me what it is and is there away to fix it before it get worst
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