white spots on leaves

8 wks old plants, first time grower........ whats up with the little white spots on leaves. any info will help, have about 40 plants, just a hand full have this problem

are they white and a little fuzzy looking? You could have some powdery milder starting and you should take care of it fast before it takes over. These spores come from all sorts of place and once the right envrionment exists for tem, they really take off. There is an organic OMRI certified fungicide called actinovate, I just used this on my plants once and have seen no return signs. apply once a week as needed, good luck