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Poster: Biology & Disease Mgmt: Mycology


Mining of abiotic and biotic factors for prediction of soybean sudden death syndrome (SDS) symptoms
Z. NOEL (1), M. Roth (1), J. Wang (1), E. Papenfuss (1), D. Kramer (1), M. Chilvers (1) (1) Michigan State University, U.S.A.

Fusarium virguliforme is the causal agent of soybean sudden death syndrome (SDS) in the U.S. The pathogen infects roots initially, but foliar chlorosis and necrosis caused by a phytotoxin, do not usually appear until later in the growing season when it is too late to consider replanting. In this study, parameters measured before planting were used as indicators of SDS development later in the season. Prior to planting, soil nutrients (pH, K, Ca, Mg, Zn, Mn, Cu, Fe, and organic matter) soybean cyst nematode counts (eggs, juveniles, and adults), and F. virguliforme inoculum density were used to determine which variables or combination of variables helped explain SDS development throughout the growing season. Principle components analysis allowed for dimensional reduction and indicated which variables were most important for disease prediction. Disease symptoms at R5 and R6 were significantly correlated with soybean cyst nematode data and F. virguliforme inoculum density. Other multivariate techniques are currently being performed to allow for a better understanding of the factors that contribute to the disease development of SDS.