Leaves turning brown and brittle

2cheezy4tuna

2cheezy4tuna

Member
Hi everyone this is my first post, I have a small grow going, and one of my plants overnight started turning brown and brittle. Not sure if it is heat stress, nute burn, or overwatering. Would be great if someone could give me some advice. Im using sunshine #4 with the fox farms grow big. Last time watered with nutes 3 days ago and used just plain ph water last night. She is almost 1 month and autoflowerer here are some photos

potted DAY 16 (9).jpgpotted DAY 16 (11).jpgpotted DAY 16 (12).jpg


 
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slomoking13

Well-Known Member
what's the temp, humidity, light wattage, and how far away from the plant is your light? It looks like heat stress.
 
jawbrodt

jawbrodt

Well-Known Member
If it's not some kind of fungus/mold attack, I'd say it's heat damage. Was it touching a CFL or any other source of heat? I don't think it's yous overhead light, because none of the other tops look damaged. Hmm....
 
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slomoking13

Well-Known Member
Everything sounds good! Looks like most of your damage is on the taller plant, correct? i would say throw the taller ones closer to the center where the light is higher up because when those side lights rotate above the taller plants, they will definately be too close. Hope it works out for you!
 
Scuba

Scuba

Well-Known Member
2cheezy4tuna said:
temp stays between 75-79, Humidity is 40-45 Lights I have 3 600 watt HPS lights on a sun twist here is a pic of my setup
View attachment 1090967
Click to expand...
dude those lights are WAY to close, that's why their burning. put your hand just on top of the tallest plant, if you hand starts burning or gets REALLY hot then it's too close. you should raise the lights.
 
Scuba

Scuba

Well-Known Member
it doesn't take long to dehydrate the top leafs so it's better to keep them a fair distance away from the bulb. I keep my plants at least a 1' away from my 1000w so just put your hand under the light and find a spot where it doesn't burn your hand, but kinda slightly warms it
 
lakaicorey112

lakaicorey112

Member
pH Fluctuation It could be over fertilization, but more likely it is due to the pH being off. Too high or too low a pH can lock up nutrients in the form of undisolvable salts and compounds, some of which are actually toxic to the plants. What then happens is the grower then tries to supplement the plants diet by adding more fertilizers, throwing off the pH even more and locking up even more nutrients. flush the plant and spray the leaves to rehydrate her. it could also be a Phosphorus deficiency
 
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