Research Summary Abstract
The IR-4 Project screens new active ingredients for potential deleterious impacts to aid growers in selection of appropriate disease management tools for their crops. From 2014 to 2018, IR-4 completed 78 trials on 34 environmental horticulture plant species examining phytotoxicity related to foliar applications of Orkestra (fluxapyroxad + pyraclostrobin). During 2016 and 2018, an additional 15 trials were conducted using drench application on 9 crops. In these trials, 17 species or genera exhibited minimal or no injury after foliar applications in a minimum of 3 trials for each crop. Thirteen of these are already on the current label for this active ingredient; the other four (Aquilegia sp., Hemerocallis sp., Picea sp. and Pinus sp.) can be added to a list of tolerant plants in the current label. Only two plant species (Cornus florida and Impatiens hawkeri) exhibited significant injury in one study. All trials for 13 other species or genera exhibited no or minimal injury in the limited number of trials (one or two) for each crop. Four of these are already in the current label; BASF can consider adding the other nine to the label. Drench application caused no significant phytotoxicity on all crops tested.