Getting a few yellowish spots on a couple plants

Title says it all. I'm not very experienced but I think I might have a deficiency. I'm using dyna-gro in coco, dtw. Plants are 1 week into flower, 600w in 4x4 tent w Scrog.

It looks kinda like rusty, but more yellow than orange. On a couple leaves, it's actually made a few holes.

I guessing you got some bugs
its hard to be sure but the safety in spraying some neem oil or azamax to slow them down until you can know for sure


tell me how many mls of each product/nutreint your adding per gallon

how many gallons are you mixing at a time
are you hand watering or on a timer

are you tracking your ph and EC/ppm?