Hamco, you will find granny smith apples to be highly ANTI fungal as they contain malic acid whereas the other apples containing much more Sugar contain far less. In my view, the world expert on dealing with FUNGUS in general is Doug Kaufmann of knowthecause.com. He has been working in this area for decades to a great degree with an anti-fungal diet that is very easy and free. You needn't buy anything to get going on the diet. See: knowthecause.com. I myself have been working with folks with the anti-fungal diet and have seen miracles. Either way, granny smiths are very ok.