Control of Asian soybean rust with mancozeb, a multi-site fungicide

Abstract

An experiment conducted in the field the action of mancozeb, a fungicide of multi-site action was tested, to control soybean rust caused by Phakopsora pachyrhizi. Its performance was compared to that of the mixture cyproconazole (DMI) + azoxystrobin (QoI). The soybean cultivar NA 7337 RR was used with a population of 400,000 plants/ha cultivated in 20m2 plots. Treatments consisted of mancozeb levels (1.5 and 2.0 kg/ha) applied four, six and eight times. The DMI + QoI mixture was applied three times at 0.3 L/ha + Nimbus. Rust severity was assessed six times in the plots and data were integrated as the area under the disease progress curve (AUDPC). The plots were harvested and grain yield was expressed as kg/ha. Data on AUDPC and yield were subjected to analysis of variance and means compared according to Turkey's test (p = 0.005). Treatments with mancozeb were superior to DMI + QoI mixture both for rust control and grain yield. Four applications of 2.0 k/ha mancozeb were more efficient than three applications of the mixture used as standard. Mancozeb has the potential to be added to fungicide mixtures in the establishment of soybean rust anti-resistance strategy.

Use of systemic fungicides combined with multisite to control of asian rust and soybean yield

“…For the grain yield, in the 2016/17 crop, treatments A+B, T+P+Mb, A+B+Mb and Mb differed statistically from the 2017/18 crop (Table 2), corroborating with Silva et al (2015), in which the multisite mancozeb, applied four and five times, at doses of 2.0 and 1.5 kg ha -1 , provided better control of Asian soybean rust. Additionally, the treatment with trifloxystrobin + prothioconazole + mancozeb (T+P+Mb) stood out for yield in the two crop seasons in which the work was conducted (Table 2).…”

“…The difficulty in controlling Asian rust with fungicides is becoming increasingly evident, proving the high adaptability of the etiological agent (SILVA et al, 2015). In this sense, the combination between systemic fungicides (site specific) and multisite action arises as a possibility to increase the control efficiency for this plant pathology (KNEBEL et al, 2019).…”

Manganês No Brasil: Descoberta, Extração, Consumo E Comercialização Numa Perspectiva Histórica

“…O etileno(bis-ditiocarbamato) de manganês e zinco, fungicida e acaricida, é usado em mais de 30 culturas como verduras e árvores frutíferas. 28 As aplicações do manganês e de seus compostos exigem tanto um grau de pureza mais elevado como um teor de impurezas minimizado. Por exemplo, para o emprego em pilhas alcalinas, o MnO 2 não deve conter cobre, níquel, cobalto e arsênio, e pode apresentar, no máximo, 4% em massa de ferro.…”

Fungicidas protetores no manejo da ferrugem da soja, processos fisiológicos e produtividade da cultura

“…Esses resultados diferem dos apresentados por Silva et al (2015), quando de quatro a oito aplicações isoladas de mancozebe na cultura da soja proporcionaram médias de produtividade superiores à testemunha e à três aplicações de ciproconazol + azoxistrobina.…”