Can someone tell me what causes yellowing of leaves and eventual leaf drop? All the tomatoes in the photos came out of the same cell tray the larger ones were transplanted to the 3.25 pots about a week before the rest but the smaller ones have not shown any growth in 3 weeks and it seems like they are getting more and more yellow. Some of the cotyledons are starting to fall off but I am also losing leaves that are not yellow. My pepper plants are also showing the same symptoms they are getting ferts and are definetly not being overwatered. There is a white mold starting to form on the top of the Pro-Mix. could this be a fungus of some sort? I was initially leaning towards a nitrogen deficiency maybe the ferts are not strong enough? I am using Shultz Plant Food Plus 10-15-10.

Dale