It has very good activity against rusts, leaf blotch, and powdery mildew. It is a little weaker on tan spot. No adjuvant is required. Quadris , made by Syngenta, was new last year. It belongs to a new class of fungicides called strobilurins.
Thorough coverage is important.
It has shown superior activity against leaf rust, tan spot, and the leaf blotch complex in university trials. Its main weakness is powdery mildew, but that is not a big factor in Kansas. Since Quadris has limited curative activity, application should be made prior to, or in the early stages of disease development. It can be applied through the fully headed stage. Do not apply after commencement of pollen shed.