Oak wilt is a primary pathogen; it does not need an opportunity (such as stress from drought etc.) to kill your tree. The tree can be perfectly healthy, but oak wilt is still going to get it, if it is exposed. Other tree diseases, such as oak decline, foliar fungii problems, hypoxalon etc. are opportunistic diseases. If you keep the tree healthy, then the tree is not going to get these diseases. This is true for about 99% of tree diseases. For oak wilt, Dutch elm disease and chestnut blight, tree health has no bearing on whether the tree will get the disease or not. Thus, the products represented to prevent oak wilt by keeping your trees healthy absolutely cannot prevent oak wilt, because it is a primary pathogen. There might be a use for these “get healthy” tree products, rather than trying to use it as a preventative measure, such as spraying the trees before they get oak wilt. If the disease comes through your trees, some of your trees will survive. There is about a 20% survival rate with oak wilt. Survival means that the tree is still alive. It doesn’t mean that the tree looks good. In these situations, use these other chemicals to try to nurse the tree back to health. Using the alternative treatments as a preventative for oak wilt is a waste of your money, because it is not going to work.