there were virtually entire turkey populations that have been wiped out in areas due to bacteria found in low quality suppliment feed, like deer corn, cracked corn, etc.
Corn can be toxic to turkeys also there isn't much nutritional value in it. Plant food plots such as winter wheat,chufa,sourgum,lentils, ect. They are much better for the birds and are a legal source of food and can be hunted over.