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POSTERS: Host resistance screening

Resistance of commercial dry bean cultivars to soybean cyst nematode
Olivia Hamilton - Plant Pathology, NDSU. Juan Osorno- Plant Sciences, NDSU, Berlin Nelson- Plant Pathology NDSU

Soybean cyst nematode (SCN), Heterodera glycines, is an important nematode pest which can reduce dry bean yields. The nematode now occurs in major dry bean growing areas in North Dakota, a major producer of dry bean. However, information on how SCN impacts various dry bean cultivars is limited. A diverse collection of 69 commercially available cultivars in 8 bean classes was evaluated for resistance to SCN in a greenhouse. Seed was pre-germinated, planted in conetainers with 110 cm3 of pasteurized Prairie loam soil then inoculated with HG 0 at VC growth stage (3,000 eggs/plant). Conetainers were placed in racks over a heating pad and the racks were enclosed in foam insulation on a greenhouse bench to maintain the root zone at 27° C. Plants were grown for 40 days with 16 h of natural and artificial light then SCN females were extracted and a female index (FI) calculated or each variety using Barnes soybean as the susceptible check. Large differences in FI were observed within and between bean classes with some varieties showing resistant to moderately resistant reactions to SCN. Bean varieties with high levels of resistance will be needed for management of this nematode as SCN spreads in bean production areas.