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Asian soybean rust caused by Phakopsora pachyrhizi reduces crop yield up to 90%. It has been observed loss of control efficacy with sitespecific fungicides, it has been proposed to combine them with mancozeb as anti-resistance strategy. The objective was to evaluate these fungicides on two sowing dates. The study was conducted under field conditions in Yguazu, Paraguay, with eight treatments: no application (T1), prothioconazole and trifloxystrobin (T2), mancozeb (T3), azoxystrobin and bezonvindiflupyr (T4), fluxapyroxad, epoxiconazole and pyraclostrobin (T5), T2 + T3 (T6), T4 + T3 (T7), and T5 + T3 (T8) and two late sowings (September 20 and November 20, 2017), in a randomized complete block design with three repetitions. The yield was not modified by the application of the treatments. Significant difference was observed by the sowing date in the severity and weight of one thousand seeds (PMS). T6 showed lower severity and T5 higher PMS on the first planting date. Site-specific fungicides plus mancozeb had a higher percentage of disease control efficacy. The combination of mancozeb with mixtures of site-specific fungicides is effective for the control of asian soybean rust.

Fungicidas sitio-específicos combinados con Mancozeb para el control de la roya asiática de la soya