I've been having problems with my tomatoes. First i thought it might be a magnesium deficiency.. I went out today and took some pictures. maybe you guys can help.me. I also noticed the same thing was on a vine growing up my tomato cages. I have pictures of it too. its the first picture posted. this started on the lower leaves and is moving up to the new leaves on top.. I've been using ebsome salts so i don't think its mag. def. it happened last yr too. the plants looked great till a week and a half ago

Here are the pictures hope you can help me.