Community Research and Development Information Service - CORDIS

Economic losses in soybean crops caused by bacterial blight

Bacterial blight of soybean caused by Pseudomonas syringae pv glycinea is endemic in North America and has also been reported in southern Europe. Loses in terms of yield and quality owing to this bacterium have never been assesed in Europe and its epidemiology under European climatic conditions is unknown. Work is being done to assess losses in both yield and quality caused by this disease.

Field experiments are being carried out in 3 locations, namely, Angers (France), Bologna (Italy) and Sevilla (Spain). In each experiment, 1, 2 or 3 varieties of soybean are used and with each variety, 2 seed infection levels are compared with a healthy check. The seeds were artificially infected with a selected strain of Pseudomonas syringae pv glycinea by gently pricking seedcoats and dipping the seeds into a suspension of the pathogen. The seeds were sown immediately after infection. During the growing season, field plots have been observed weekly for the presence and development of bacterial blight and the incidence and severity of the disease has been assessed. Epiphytic populations of Pseudomonas syringae pv glycinea have also been assessed at 2 stages of growth when the plant showed 2 true leaves and at the beginning of the blooming period. Records were kept of climatic conditions throughout the growing season. Harvested seeds were submitted to analysis in order to evaluate their levels of contamination.

Reported by

Service Regional de la Protection des Vegetaux
10 Rue le Notre
49044 Angers 01
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