So I started to develop a def, I posted about it over in the plant problems area. Small rust spots are developing on some of the older leafs. In would say about 20% of old growth is affected. New growth is fine at the moment.
I do not like to over react to these things any more, so I measured my response,lol.
I do not think it is fungal (at least not in the root zone) since I use h202 from the very beginning of this grow and my res temps are well below 73 at all times.
I do not think it is fungal from the air up top since the way it is spreading is not like fungus or mold spread on a surface when it attacks it.
To me as well as some others it looks like a def. i.e. Mg. Another thing that could cause these symptoms is ozone damage, which is unlikely but possible, I guess. I do not generate ozone in my grow space, but I do run fans, a media type air purifier, a de-humidifier, ac etc. and I'm in a sealed environment, which could cause the ozone levels to spike in the room since I'm not venting during lights on and all electronics do emit some amount of ozone. I have a cycle timer that I will use to vent my sealed room for 1min. every 2 hours during lights on. I think that is a prudent practice no matter if my symptoms are related or not.
-I flushed with a mild nutrient solution (about 450 ppm), which gave me a chance to make sure that all my run-off perimeters are ok.
- I turned my chiller & circulation pump for the res back on (raises my res temps back to 69 from 60 and keeps it constant at 69) I read that uptake problems with certain elements can exist at lower temps. I don't know if that is so, but it is not a big deal to do, so why not!
- I increased my nutes from 6ml/g to 7 ml/g
- Added some silicone for stress relief to my res.
- increased Cal-Mag from 5ml/g to 10ml/g
I'll keep a close Eye on it. Any input is appreciated.
Unity