What time of year should I apply XPo?
Because of the characteristics of XPo mentioned above, there are certain times of the year when applications will give the best results. A program of early fall applications followed by series of spring applications after air temperatures have reached 65 to 70 degrees are recommended. The fall applications infect the Poa annua and weaken it prior to overwintering. The spring applications infect plants that either germinated and established after the fall applications were made, infect plants that were not infected in the fall and increase the level of infection in sick plants that overwintered. The multiple applications are required to insure that applications are made during a time when environmental conditions are optimal for infection to occur.
