The arrival of Asian rust across Brazil's soybean belt from 2003 caused a certain amount of panic, prompting some to wildly speculate it may mean the end of the oilseed in the No. 2 soy-producing country.
Those predictions were wide of the mark, and subsequent years saw Brazilian farmers learn to control the Phakopsora pachyrhizi fungus through spraying pre-emptively and often.
However, experts warn that rust is acquiring resistance to the fungicides currently being employed, and there are no new products in the pipeline.
"We are seeing the existing products markedly losing efficiency," said Claudia Godoy, researcher at Embrapa Soja, ...