BLAST the evil squirrel
Char for you I would suggest finding a source of ordinary corn meal and start using it now. If you cannot find it at a feed store, find it at a grocery store specializing in Hispanic foods. On San Antonio's south and west sides, I can find it at the HEB in 25-pound bags with no additives. Additives are frequently used in Mexican cooking to make it easy to make tortillas. Get the stuff with no additives.
Apply at 10 pounds per 1,000 square feet every month to 6 weeks. That should take care of your fungus problems. I get a fungus every spring because of the way my wife gardens. She likes to toss the trimmings on the grass and leave them for a week or so. That shuts off the air circulation and when we move the trimmings the grass is diseased. Once you have an infection, the corn meal dose needs to be doubled to kill the disease, so I apply at 15-20 pounds per 1,000.
Corn meal has worked for me every year since 2002. I positively swear by it. I'm not talking about corn GLUTEN meal. That is a different material for a different use.