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65

Use of chemigation to apply fungicides for control of foliar soybean diseases

Presenter: T. C. Gustafson

All authors and affiliations: T. C. GUSTAFSON and L. J. Giesler. University of Nebraska, Lincoln, NE

For successful control of soybean rust, timely applications of fungicides are necessary. In the event of a soybean rust epidemic, high demand for fungicide application through traditional self-propelled boom sprayers may result in poor application timing. One option available to producers is to apply fungicides through an irrigation system. Small plot chemigation trials were conducted in 2005 and 2006 at the South Central Agricultural Laboratory near Clay Center, NE, to determine the effectiveness of chemigation in controlling foliar diseases of soybean. Fungicides were applied with a lateral-move irrigation system by injection into the water stream at each drop tube near the nozzle. Fungicides were also applied through a hand boom to compare the two application techniques. Severity of brown spot (Septoria glycines) was rated 14 days after treatment. Leaf retention was assessed in 2006, 7 weeks after treatment. Applications of fungicides through the irrigation system were as effective as or better than hand boom applications in reducing the severity of brown spot. In 2006, applications of Headline resulted in greater leaf retention than the control during senescence with a higher level of retention in hand boom-treated plots. In 2005, treatments of Headline or a combination of Headline and Caramba resulted in higher yield compared to the control. This increased yield effect was not observed in 2006. In both years, the highest yield resulted from the application of Headline and Caramba with the hand boom. More research is needed to investigate the effectiveness of chemigation in controlling soybean diseases.

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