are some strains overly sensitive to co2?

It might just be those plants dont like that much heat.when i run my co2 my leaves stand up more but i try not to exceed 85f and i'm growing master kush. maybe your strain needs to be cooler like 82-85 instead of 85-93.also, if you water your plants alot right before you raise your temps it can make your humidity go up enough to possibly make your leaves do that. then again some guys like closet growth run way up there and there plants love it. good luck

I second that. I would bet you have a strain that is sensitive to high heat. If the air temp is reaching 93 then the leaf SURFACE temp is easily going to be 100 or more. I would also bet that your plants only see this temp when you are cycling your fans for CO2 soaks. Or it may be a heat fluctuation issue. They may be ok with 85-93 degrees, but not ok with going back and forth between those temps over and over again all day as the co2 cycles.

CO2 is basically the equivalent of O2 for us. If the PPM is raised we just need less of it. Its like getting medical grade 02 in the hospital, you cant OD on it. PLants are actually wired to want more CO2. Millions of years ago Co2 levels on the planet were much much higher, the planets plants got used to this and thrived in it.

50,000ppm is a lot of CO2, I could maybe see it choking plants and displacing too much oxygen. Humans would long be dead in a 50,000ppm co2 environment, but not necessarily plants. 1500 PPM is not a lot of CO2 at all. A good dutch oven has many thousands more PPM than that and my wife, although disgusted and slightly traumatized, doesnt almost die from co2 poisoning.

Coals said:

I second that. I would bet you have a strain that is sensitive to high heat. If the air temp is reaching 93 then the leaf SURFACE temp is easily going to be 100 or more. I would also bet that your plants only see this temp when you are cycling your fans for CO2 soaks. Or it may be a heat fluctuation issue. They may be ok with 85-93 degrees, but not ok with going back and forth between those temps over and over again all day as the co2 cycles.

CO2 is basically the equivalent of O2 for us. If the PPM is raised we just need less of it. Its like getting medical grade 02 in the hospital, you cant OD on it. PLants are actually wired to want more CO2. Millions of years ago Co2 levels on the planet were much much higher, the planets plants got used to this and thrived in it.

50,000ppm is a lot of CO2, I could maybe see it choking plants and displacing too much oxygen. Humans would long be dead in a 50,000ppm co2 environment, but not necessarily plants. 1500 PPM is not a lot of CO2 at all, a good dutch oven has thousands more PPM than that.

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Plants can effectively use CO2 up to .20 percent concentration; almost seven times the concentration (.03) naturally present in the atmosphere.

it's not a temperature problem as i have had the wilting first occur in the seventies. i raised the temp to recommended co2 temps to see if that would help. it didn't. i'm working now under the assumption that the plants are getting hit with a super high amount of co2 when the generator fires, so i'm reworking my ventilation.

co2 and the sun are their lifeblood. 1000ppm isn't even high for any plant so i doubt its the co2. Whats your air temp?