CM is almost impossible to find in FL. I live in the St.Pete area and have called Feed Stores from here to Tampa to Ft.Myers with no luck. Cracked corn is your only option from a feed store. It still works, just takes longer.

If you must have CM you could buy the corn from a feed store and grind it yourself or buy Food Grade CM. Try to find a store that sells bulk food. Any of the Natural Food Stores should carry it in bulk, plus give discounts if you order a 50lb bag.

I would cut out a section of the infected area and take it to your local extension office so they can determine exactly what the problem is.

The link below gives some good info on TARR.

Here is a link that might be useful: TARR FL

Spray with milk or liquid seaweed until you can get corn. Or if you were ambitious, you could make garlic juice and spray with that. Put 2 pounds of garlic and 32 ounces of water in a blender. Strain out the pulp for your next neighborhood Italian dinner, and spray the juice.

The bulk corn meal you find in grocery stores is almost always adulterated to make a tortilla mix - at least in San Antonio it is. Just something to keep in mind.