Submitted to: Journal of Agriculture of the University of Puerto Rico
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/12/2002
Publication Date: 10/1/2002
Citation: SMITH, J.R. HETERODERA GLYCINES RACE 2 AND THE YIELD OF COMMON BEAN IN PUERTO RICO. JOURNAL OF AGRICULTURE OF THE UNIVERSITY OF PUERTO RICO. 2002. vol. 86 (3-4). p. 117-122. Interpretive Summary: Soybean cyst nematode is a highly destructive pathogen of soybean. Common bean can also be a good host for soybean cyst nematode, but the effect of soybean cyst nematode on seed yield of common bean is unknown. Soybean and common bean production areas overlap in the U.S., India, and possibly other areas of the world. This study demonstrated that race-2 soybean cyst nematode did not affect seed yield or other yield components of common bea varieties representing three market classes (snap, pinto, and cranberry). In comparing resistant and susceptible varieties from each market class, no difference in yield was observed for any variety due to differing infestation levels of soybean cyst nematode. This is the first report of seed yield of common bean in the presence of soybean cyst nematode. This study will benefit scientists and farmers by contributing new knowledge regarding the impact of soybean cyst nematode on seed yield of common bean. .
Technical Abstract: Soybean cyst nematode (SCN), Heterodera glycines, is a destructive pathogen of soybean (Glycine max) and was recently discovered in Puerto Rico. Common bean (Phaseolus vulgaris) can also be a good host for SCN, but information is lacking on how SCN may affect seed yield of common bean. The objective of this study was to determine the effect of the Puerto Rico race-2 population of SCN on yield components of three market classes of common bean (snap, pinto, and cranberry). Two representative lines, differing in resistance/susceptibility to race-2 SCN, were selected from each market class and exposed to three infestation densities (0, 17, and 33 eggs/juveniles/pot*-1) of SCN. A factorial arrangement of line and infestation density was used in a randomized complete block design with six replications in a greenhouse in Isabela, Puerto Rico in 2000. Data for seed number, pod number, and seed yield were collected for each level of line and infestation density. SCN had no effect on any yield component. Observed differences in yield components were due to genotypic factors unrelated to SCN. Initial conclusions indicate that SCN will not affect yield of common bean in Puerto Rico. Follow-up studies of common bean and SCN, using course-textured soils, may be recommended.