Identifying Host Resistance in Dry Edible Beans ( Phaseolus vulgaris L.) against Soybean Cyst Nematode ( Heterodera glycines Ichinohe) Population HG Type 2.5.7 in North Dakota

North Dakota (ND) is the largest commercial producer of dry beans (Phaseolus vulgaris L.) in the US. Both dry beans and soybeans (Glycine max (L.) Merr.), are suitable hosts to soybean cyst nematode (SCN; Heterodera glycines Ichinohe), making SCN a serious production threat to both crops in ND. SCN can reduce yield by up to 56% in dry beans under heavy infestation. Host resistance is one of the best strategies to manage SCN. Resistance sources in dry beans remain limited for different SCN populations prevalent in this region. Thus, this study screened 196 dry bean genotypes, including 139 breeding lines and cultivars obtained from the North Dakota State University (NDSU) Dry Bean Breeding Program and 57 germplasm accessions from the United States Department of Agriculture-Germplasm Resource Information Network (USDA-GRIN) for their responses to SCN HG type 2.5.7. The genotypes were screened twice under controlled growth chamber conditions. Female Index (FI%) was calculated to determine resistance responses. Among the dry bean market classes from NDSU, slow darkening pinto was the least susceptible (FI = 48.0), followed by black (FI = 56.7), both belonging to the Middle-American gene pool. From the Andean gene pool, light red kidney was the most susceptible (FI = 88.2). None of the breeding lines and cultivars tested were resistant, but 19 accessions from USDA-GRIN showed moderate resistance to HG 2.5.7 from ND. The findings document valuable information to understand SCN reproduction in dry beans and develop SCN-resistant cultivars for ND and beyond in the future.