I was listening to a podcast with the head of turkey management for Kentucky, Zak Danks. Disease and health in coordination with the state vet was one of the things they are studying right now along with other things spurred on by public complaints of lower numbers. They were talking about the cicada hatches and how it shows a definite correlation with turkey populations because of the high numbers seen after in regards to hen condition, poult production, nest success, re-nesting, harvest numbers, etc. They said it indicated turkeys were limited due to insects, because ideally, you would not want to see a single factor like that show such drastic influences. Agriculture, forestry, development practices, and other landscape wide, insect affecting practices can affect turkey numbers. Another thing he talked about was trapping of predators was encouraged, but you have to realize the scale, spatially and temporally, over years of intensive effort to maybe document a success, and that's if you have the habitat in place.