Hi I really could do with abit of advise, I have 4 white widow and I'm in 5 week of flowering. They in 1m x 1m x 2m tent, under a hps 400w. About week and half ago I noticed and few yellow spots appearing and then before I knew it it was a over the plant (mostly on top). As soon as I noticed the spots I started flushing, and adding call mag. I'm still flushing at the moment. Now 3 out of 4 plants are like it. At first it thought it was calcium so which it why I got calmag, but now I'm not sure. Maybe a mix of nut deficiency and heat stress? I haven't got that long left now, and just hopping they see it through. I don't think this is developing anymore, maybe slowed down abit. Should I trim can all the leafs which are rusted and tried up. I'll add some pictures, please can somebody help me out with this, this is my first grow, so need advise.
Thanks alot
Thanks alot
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