It is not recommended to mix a surfactant such as Prime Source MSO Select Surfactant with Strobe unless your experience has shown it would not harm the plants. Per the product label: Do not tank mix Strobe 50WG with other fungicides, insecticides, herbicides, fertilizers, adjuvants, etc., unless local experience indicates that the tank mix is safe to ornamental plants. Propiconzole fungicides also do not list that a surfactant is needed so we would not recommend using one.
