Right now that cornmeal would be better used to make cornbread or cornbread dressing (if you need some more).

I have been unable to find anything to support using corn meal for a fungicide. I know labs use corn meal agar to grow certain fungi, and the few research papers I can find that mention corn meal used as a fungicide found that it did nothing to suppress the fungi (University of Virginia, peanut crops, and University of Oklahoma, turf grass). Of course some of the corn (GM BT corn) will soon be the predominate type available (if not already) and that may help with some insects.
All the rest of the information that I can find supports the research at Iowa State about corn gluten meal being a growth suppresent. If someone knows of a good universtiy research paper on using corn meal as a fungicide I'd like to see it.

Texas A&M-Stephenville did the research on corn meal. Originally, it was found to control algae growth in stock tanks. Then it was found that it also stimulated the growth of beneficial fungi that helped to control some of the harmful ones. Therefore, it can sometimes be used to cure fungal diseases, such as brown spot, in lawn grasses. As to publications, I haven't tried to search them out, but you should be able to find some information on one of the Texas A&M web sites.

I saw the study about the stock tanks, but I have not seen any study about the fungicidal properties elsewhere. I've spent a lot of time at Texas A & M website looking and find absolutely nothing.