I think we may have the same problems !!! ill post a few pictures if i can ... im almost to week 1 in veg they was having spots that Looked like yours at 1st, It could have been PM. (powdery mildew) ! So i Sprayed the with wettable sulfur 7 days ago, When they was seedlings or about the size of the ones still in their solo cups. that may also be why some of them are messing up ..It may have been to strong for seedlings & maybe i sprayed more on some than others the white dry spots is the coating the sulfur left, that's not PM, that's SULFUR. the sour Bubba is 1 of the worst 1's and was 1 of the best ones a day ago !!! thats the SOUR BUBBA lEAF LOOK AT IT WELL IS THAT INSECTS OR IS THAT LIGHT BURN FROM SULFER,OR FROM SPAYING THE SULFUR TO STRONG ? it COULD BE SANY THINGS, thats why im so puzzled... i hope its not insects in the soil, That would be the worse case i believe ! Maybe its light burn to those top leaves that got sprayed so heavy ! it could be from alot of things !! thats why i need to ask an expert !!!! "RougeBoyGenetics"