Source: ProMED via SeedQuest

Soybean samples from northern Mato Grosso, Brazil, have been sent to Embrapa, the Brazilian Agricultural Research Corporation, to check for the presence of a disease called Crazy Soybean II. The disease was first discovered in Brazilian soybean fields several years ago, and since then it has been found sporadically in central Brazil.

The organism that causes the disease is yet unknown, and the origin of the disease is also a mystery. During the 2010/11 growing season, the distribution of the disease and the severity varied by region, but it was mostly found in isolated fields in central and northern Mato Grosso. On a localized basis, the disease can cause economic losses, but on a statewide basis, it appears to be another disease that farmers must watch and try to manage.

In June of 2010, researchers formed a working group to monitor the distribution of the disease and to try and ascertain the causal organism. Since all the soybean fields in Brazil receive fungicide applications to control soybean rust, this new disease is probably not a fungus. Speculation is that a virus may be the cause of the abnormality.

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