Evaluating Seed Treatments for the Management of Soybean Cyst Nematode (Heterodera glycines Ichinohe) in Dry Bean (Phaseolus vulgaris L.)

Abstract

Soybean cyst nematode (Heterodera glycines; SCN) infestation is a major cause of yield loss in soybean (Glycine max), and dry bean (Phaseolus vulgaris) is an alternative host. In soybean, genetic resistance and seed treatments are mainly used for SCN management however these options are not available in dry bean. Seven seed treatments were assessed for effects on SCN populations in black (cv. Zorro) and kidney (cv. Dynasty; Red Hawk) bean. Two field studies were conducted in 2018 on naturally infested soils near Highgate and Rodney, Ontario. In addition, two different growth cabinet studies were completed. There was little treatment response in field studies. In the first growth cabinet study, Bacillus amyloliquefaciens and Bacillus firmus reduced cysts in black and kidney bean while fluopyram reduced cysts in Red Hawk only. In second study, fluopyram reduced cysts by 50% and 88% in Dynasty and Red Hawk, respectively while other treatments were inconsistent.