First Grow Problem

OG Kush auto under 450 watt hps.
What is causing this? Other plants under the same conditions are fine

I'm not sure whats causing it, but I run into a lot of problems in veg with plant problems. I get a product called azamax and its mainly for spider mites and other bugs, but also helps out tons with plant deficiencies. Spray it about 30 mins after lights are off and don't spray it past day 15 of flower.

Your light is to close, you have pests, you over fed and burned, since your other plants are fine, I'm leaning to over fed and burned might have a cal deficiency, flush out your plant, check your ph, if you want you can put a little DE Earth in to add a bit of cal, go easy on nutrients, autos take a lot less. Allso DE Earth is an organic way to add cal & kill pests.

The plants in your photo show heat stress. Your lights are too close.

thanks, I will move the lights