Effect of planting date on Fusarium spp. and Diaporthe/Phomopsis complex incidence and its relationship with soybean seed quality.

MERILES, J. M.; GIORDA, L. M.; MAESTRI, D. M.

JOURNAL OF PHYTOPATHOLOGY-PHYTOPATHOLOGISCHE ZEITSCHRIFT

Año: 2002 vol. 150 p. 606 - 610

0931-1785

Fifteen soybean genotypes from maturity groups IV, V and VI were planted on three dates at Manfredi Experimental Station – INTA, Córdoba Province, Argentina. Seeds were harvested at harvest maturity and evaluated for seed infection by Fusarium spp. and Diaporthe/Phomopsis complex, physical and chemical parameters. A negative significant correlation between planting date (PD) and fungal incidence was observed at p = 0.05. The greater percentage of fungal incidence at earlier PD was consistent with lower seed weight and volume, higher oil content and no change in protein content. Regarding fatty acid composition, the highest values of fungal incidence were associated with increased oleic acid and decreased linoleic and linolenic acid contents. The results obtained suggest that planting late maturity cultivars or delaying the planting of early and mid-season cultivars may reduce seed infection by Fusarium spp. and Diaporthe/Phomopsis complex.