Redeye if you find anything on this prob will you post it as i got the same thing going on with just one strain the other 3 strains in my flower room are not affected . the differance from my prob and urs is im in soil its been anoying me for the last 3 weeks and i can find and answer its not cal with me i use sensi cal mag bloom its not ph my soil is ph 6.8 and run off ph is 6.9 my room is well ventillated and man is this winding me up.White widow can be fussy on nutes mate so you may be on the right track .thanks the postman.

pic one is the affected plant pic 2 the other plants no other strains are affected exept aurora indica