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Brazil soybean rust at record level

Outbreaks of Asian soybean rust ( Phakopsora pachyrhizi) have spread at record pace in Brazil this year, researchers report. Resistance to fungicides is also causing concern. Some 618 rust incidences had been detected by early January, of which 242 came in the first ten days of 2010, the anti-rust consortium, the CAF, notes. That is the highest rate since the first detections in 2001, running double the rate of 2006/07, it adds. The rate had been falling, with last season the lowest on record. The rise is partially due to heavier rainfall than in previous seasons. The CAF says that priority should be given to applications of combination fungicides, as resistance to triazoles was noted in the past two seasons ( Agrow No 543, p 17). The first appearance of rust came earlier than usual this season ( Agrow No 581, p 16).



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