Yo, to me that looks like worms. I had this problem last year but not until my plants were flowering. Moths will fly onto your plant and lay eggs on the undersides of the leaves, the eggs hatch and then feast on your leaves. Worst case scenario is the eggs are planted in the bud and the worm uses the bud as a cocoon. It will shit and rot your buds and eat them from the inside. but your plants are just starting out. I would examine your plants thoroughly, under leaves and all looking for little off-white eggs or small worms themselves, and kill them all. I dont know of any non-pesticide remedies...Cheers