Foliar applied fungicides: Effect on soybean disease, soybean yield and interaction with insecticides

In a trial conducted at the University of Minnesota Southwest research and Outreach Center, Lamberton, MN, Headline fungicide was applied at three rates at V5, at two rates at R2 and at one rate at V5 and R2. At R4, Headline, Quadris Tilt ad Bravo were applied at a single rate each. Additionally at R4 Warrior was applied alone and in combination with Headline and Quadris, Lorsban was applied with Headline and Quadris and Mustang Max was applied with headline. Differences in soybean lower leaf loss and to a lesser extent brown stem rot were observed. With the exception of Mustang Max, treatments with an insecticide had less aphids than those without. These treatment differences did not translate into yield as all treatments yielded equivalently. Differences in soybean growth were not observed. Although other diseases were present in the trial, treatment differences were not observed. With the exception of a brief yellowing in some Bravo treated plots, crop injury was not observed for any of the treatments.