Disease? I think?

Hi everyone so confused there was a couple black leaves i pull off bud this am come home and it spread i have 4 plants 2 autos in flower and 2 photos still in veg i thought i spilled somthing but now its spreading any ideas guys it almost looks oily in some spot n it came quick


Are those discolored leaf tips and edges dry and crispy, I ask because it’s farthest from the roots and extremities will suffer if it’s root damage or disease. Like fingers and toes going numb losing circulation. Just asking to rule out root disease and narrow it down…

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Its on 3 seperate plants that are like close to each other ill se if i can get better shot