White Leafs

Check out this photo. I don't know why this plant is looking like this but none of the other eight are like this. What do you think?

noriega said:

Check out this photo. I don't know why this plant is looking like this but none of the other eight are like this. What do you think?

Click to expand...

Looks like heat stress to me. How big is your lamp, how far is it away, does it have a cooltube on it and is it in an enclosed space?

Another clue is if it's only occurring on the canopy leaves. It won't be splashed nutrient, because it's too neat of a pattern. And systemic nutrient burn would appear as yellowing / burning of the leaf tips, not the central ridges.

I've seen it appear on my plants after the fan went off for half an hour. It was almost immediate. I've also seen it on one other guy's plants here recently. Never underestimate the heat of HID lamps.

I couldn't justify the expense of a cooltube at first. But now I have one, there's no way I'd bother without it. I can get a 1kW lamp a foot away from the plants and not see leaf burn.

Incidentally, this isn't burning in the normal sense. It's that the plant is shutting down photosynthesis in those areas of the leaf due to overexposure.

Sweet, that makes sense as far as the plant shuts down. What's wierd is that none of the other plants are doing the same but they all are from seed so the genes are different even though they are the same strain. WWxBBxChronic

Thanx

The plant is under a 600 watt HPS at about 2 ft away. I have a small axial fan hooked up to the hood vent blowing cool air on the tube. It's 75 deg where the plants sit. The white appears on new growth also. It's almost like white asparagus.