Merivon fungicide has been registered for use on pome and stone fruit in New York. In field trials, it has controlled diseases such as apple scab and powdery mildew in pome fruit and brown rot in stone fruits, according to information from the ­manufacturer, BASF. The active ingredients are equal parts of F500 and xemium. F500 is also the active ingredient in the fungicide Pristine. For more information, check the website www.agproducts.basf.us/products/merivon-fungicide.html.