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53

Fungicide treatment at different phenology-based program against soybean Asiatic rust (Phakopsora pachyrhizi)

Presenter: Silvânia Helena Furlan

Other authors and affiliations: . Instituto Biológico, Fitopatologia, Campinas, São Paulo 130001-970, Brazil

The trial was carried out in Paulánia, SP, Brazil, to assess different fungicides spray programs and application timings to control Phakopsora pachyrhizi. The treatments were tebuconazole (Folicur); trifloxystrobin & tebuconazole (Nativo) followed by Folicur; prothioconazole (Proline); and pyraclostrobin & epoxiconazole (Opera); all of them with two or three applications except the untreated. First application was done at pre-flowering (R1) with 0.01% of disease severity, the second application was at full fruiting (R4), and the last one was when 75% of pods reached the final size (R5.4) or 100% of the final size (R6). The best treatments to disease control were: First application with Nativo (R1) followed by Folicur 2° appl. (R4) and 3° appl. with Folicur at R5.4; Folicur, three applications and the treatment Nativo at 1° appl. (R1) followed by Folicur 2° appl. (R4), these treatments showed severity between 14.0 and 17.2%, followed by Folicur when applied at R1 and R4, treatment with Proline applied at R1, R4, and R5.4 and treatment with Opera applied at R1, R4, and R5.4 (severity between 20.7 and 22.7%). All treatments showed yield from 30.4% up to 41.1% higher than the untreated. It was possible to see that independent of the number of applications it is better to start during the pre-flowering due to the low disease severity at this crop stage, a second application at full fruiting, and a third application, if necessary, when 75% of pods reach the final size. Good results were not observed for late applications at crop stage of 100% pods at the final size.

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