Oxyfluorfen + Prodiamine Crop Safety – 2019

Research Summary Abstract

From 2009 through 2018 IR-4 completed 246 trials evaluating Biathlon (oxyfluorfen + prodiamine) crop safety. The data contained in this report were generated to register uses of oxyfluorfen + prodiamine as over-the-top applications on and around environmental horticulture plants. The rates tested were 2.75 (1X), 5.5 (2X) and 11.0 (4X) pounds active ingredient per acre (lb ai per acre). Biathlon was applied to 130 plant species / genera. Thirty-two species /genera exhibited no or minimal transient injury in at least 3 trials. Results are summarized at the species level, as there is some evidence that crop safety can differ at the varietal level. On the Biathlon label, Potentilla fruticosa appears twice: it may be used on the variety ‘Abbotswood’ but is not recommended on ‘Goldfinger’. More data are needed to establish the actual varietal sensitivities within Potentilla fruticosa and identify other species with the same difficulty. Based on the data provided here, we recommend that Acer palmatum, Arctostaphylos sp., Betula nigra, Camelia japonica, Chasmantium latifolium, Cornus florida, Cornus kousa, Cornus sericea, Dasiphora fruticosa, Dryopteris erythrosora, Distylium sp., Gladiolus spp., Lantana camara, Mahonia aquifolium, Pachysandra terminalis, Quercus rubra, Rosmarinus officinalis, Rudbeckia spp., Salvia nemorosa and Sedum spp. be added to the Biathlon label along with 13 additional varieties of species already listed in the label.

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