This study evaluated the development of Asian soybean rust and soybean yield after fungicide spraying in different phenological growth stages. Treatments consisted of spraying the fungicide mixture pyraclostrobin + epoxiconazole in the phenological stages V10 and R2; R2 and R5.2; only in R2; and no spraying (control). The total values of AUDPC (area under the disease progress curve) and soybean yield for treatments with fungicide spraying were superior to those of control. Until the 117th day after emergence, fungicide spraying in V10 and R2 led to higher rust control. The results evidenced that fungicide spraying against P. pachyrhizi is essential to reduce losses in soybean yield caused by the disease and in some situations only one fungicide spraying in R2 stage can reduce significant yield losses.
Phakopsora pachyrhizi; spraying schedule; chemical control
