Yes

This disease is commonly found in cool, temperate soyabean-growing regions worldwide. Incidences of soyabean infection with P. savastanoi pv. glycinea of >90% have been recorded. Oil and protein content of seeds can be affected (CABI, 2015). Losses range from 5% to 18% in Korea and from 4% to 40% in the USA (APS Compendium of Soybean Disease, 1999). The disease has not caused significant economic losses in most areas of the world due to resistance or plant tolerance. Kennedy and Alcorn (1980) gave details about losses of US $54.5 million for each of the years 1975, 1976, and 1977 in Iowa, USA. However, the accuracy of this figure has been questioned (CABI, 2015). The economic impact of bacterial blight of soyabeans caused by P. savastanoi pv. glycinea was investigated in Italy, France and Spain: In Italy and France an infestation level of 0.5-20% did not cause significant yield losses. Experiments highlighted the low impact of soyabean bacterial blight in Europe (Stefani et al., 1998). However, the production of quality seed may be usefull to prevent the accumulation of effective inoculum on the seed.

Minor

Yes

No

Not candidate

The economic impact of the bacterial blight of soybean caused by Pseudomonas syringae pv. glycinea has been investigated in three countries belonging to the European Union: Italy, France and Spain. Weather and growing conditions have been monitored over three years of field experiments (1992-1994) and the data analysed in order to evaluate possible yield losses. In Italy and France, no significant yield losses were observed when using different cultivars and seeds infested at 0.5-20% . In Italy the initial seed infection level was positively correlated with the infection of the harvested seed by the pathogen; both in Italy and in France on some cultivars, it was possible to correlate seed infection level with the epiphytic population of the pathogen and the intensity of symptoms affecting plants in the field. No epiphytic infection by the pathogen was observed in Spain, even at the highest seed infection rate (20%), and there was no disease in the field and no yield reduction. The pathogen seemed not to become systemic since no infection was observed on seed aseptically taken in the field just before harvest. The experiments highlighted the low impact of soybean bacterial blight under European climatic conditions, but suggested the choice of dry and warm regions for the production of quality seed to prevent the accumulation of effective inoculum on the seed year by year (Stefani et al., 1998).