Shawn Conley, State Soybean and Small Grains Specialist
In an Oat Shock:
• Trivapro fungicide increased oat yield in Badger, Esker and Shelby 427 oat varieties
• Trivapro fungicide plus Palisade PGR reduced lodging in all four varieties tested
• The application of Trivapro reduced crown rust incidence
• Growers should explore expected ROI and apply BMP’s prior to adding any additional inputs
A research trial was initiated in the spring of 2018 at the Arlington Agricultural Research Station, Arlington, WI to assess the impact of a plant growth regulator (PGR) (Palisade, trinexapac-ethyl, Syngenta) and a foliar fungicide (Trivapro, benzovindiflupyr+azoxystrobin+propiconazole, Syngenta) in oats to offset the negative effects of lodging and protect against stem rust. Four high yielding varieties were selected for this trial: 1) Antigo is a high yielding, early maturing oat with excellent test weight, medium lodging, and moderate resistance to crown rust. 2) Badger is an early season yellow seeded oat variety with medium plant height. Badger has high yield potential and excellent test weights. It has good straw strength and lodging resistance. Badger is resistant to crown rust and has good tolerance to barley yellow dwarf virus. 3) Esker is a mid-season oat which has had consistently high grain yields. BYDV tolerance is comparable to that of Ogle. Crown rust resistance is good. 4) Shelby 427 has a high yield potential, test weight, and groat percentage. It is resistant to smut, crown rust, and BYDV, and has moderate resistance to stem rust. Shelby 427 also has excellent lodging resistance, a medium plant height, and an early maturity. Palisade PGR was chosen because of its potential to mitigate lodging caused by high nitrogen fertilization levels. It acts by shortening the internodes and strengthening the stem through inhibition of cell elongation. It was applied at 12 fl oz/a at the Feekes 4 stage (23-May). Trivapro was chosen as a broadspectrum, preventative fungicide against many leaf diseases including rusts. It was applied at 13.7 fl oz/a at the Feekes 9 stage (4-Jun). Normal, UWEX recommended nitrogen and corrective fertilization practices were used in this trial.