Check the listing for details. Biathlon Pre-Emergent Herbicide - 50 Lbs. | Ornamental Weed Control. Condition: New. Listed at 174.95 USD. Biathlon is a pre-emergent granular herbicide for control of weeds in field and container production ornamentals, conifers and Christmas trees, grounds maintenance, and other label specified non-crop areas. Biathlon contains the active ingredients oxyfluorfen (2%)and prodiamine (0.75%) formulated on the Verge granule. The engineered granule provides an unprecedented level of dust reduction resulting in improved worker safety and ease of application. Biathlon provides control of a wide range of problem grass and broadleaf weeds by creating a barrier in the soil and is active for several months. It works by inhibiting cell division and disrupting cell wall formation in shoots and roots of emerging seedling weeds. Application rate: 100 lbs./acre for broadcast application; otherwise, apply uniformly over container surface at a rate of equal grams Biathlon to square feet of surface area being treated.