Magnesium deficiency or lockout.
Foliar feed with 1/4 teaspoon Epsom salts per quart of water with a drop liquid dish soap as a spreader-sticker.
The other problem is just a droplet of fert solution that has evaporated and left the salts behind in the leaf.
The fact you see so much salt in that droplet residue makes me think you are overfeeding to the point of lockout... fill out the form and we shall see.
stinkyattic Reviewed by stinkyattic on . 2 trouble plants seem to be different probs. please diagnose! Can you check these... anyone? 2 plants shown 2 pics of each sick plant temperature is not a problem. light/heat burn is not a problem no idea about ph or anything like that but others have no problems like these.. all same strain Rating: 5