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Early rust detected in Brazil soy from old crop

The first incidences of Asian soybean rust ( Phakopsora pachyrhizi) in Brazil have been detected this season, Mato Grosso’s soybean grower association, the Aprosoja, reports. The detections were noted by Ministry of Agriculture officials and came exclusively from “guaxa” soybeans - those that come from lost grains from the previous harvest. There has been no detection from soybeans planted for this season. The Aprosoja warns that the number of infected guaxa soybean plants “is the greatest in many years”. The initial detection came in the south of Mato Grosso state. Dry weather had been aiding control of the disease, but intense rainfall allowed latent disease to develop, it notes. The major Brazilian soybean-growing states leave land for 90 days between harvest and planting . Ministry officials claim at least 80% of plants that emerged from the margins of fallow land during the 90-day period were rust carriers. The accumulated cost of the disease over the past decade has totalled some $20,000 million.

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