As with insecticides, synthetic fungicides are manufactured using chemicals that are produced from other chemicals; they do not come from natural sources. They are often more effective than the natural fungicides. We have included products here in Yardner's Tool Shed that we have researched and believe to be appropriate products for homeowners who have a disease problem and wish to solve that problem with a product that will not harm the ecological balance of their yard and will not be any threat to the health and safety of pets, children and themselves.