Abstract

PLOPER, L. Daniel et al. Evaluation of the efficiency of fungicides in controlling foliage soybean diseases in Tucumán, Argentina. Rev. ind. agric. Tucumán [online]. 2015, vol.92, n.1, pp.1-15. ISSN 1851-3018.

Diseases may severely restrain soybean [Glycine max (L.) Merr.] production, especially when crops are grown under management systems and environmental conditions that favor the development and spread of pathogens. This paper reports the results of field trials which were conducted throughout four growing seasons, in order to evaluate the efficiency of different active ingredients and application timings in controlling diseases that affect soybean aerial parts, especially the late-season disease complex and Asian soybean rust. The trials were planted with A 8000 RG, a soybean cultivar from maturity group VIII, in Puesto del Medio, Burruyacú (Tucumán province), and were assessed during the 2007/2008, 2008/2009, 2009/2010 and 2010/2011 growing seasons. Evaluated active ingredients were flutriafol, pyraclostrobin + epoxiconazole, trifloxystrobin + cyproconazole, azoxystrobin + cyproconazole, picoxystrobin + cyproconazole, metominostrobin + tebuconazole, carbendazim + tebuconazole and cyproconazole + difenoconazole. Treatments were applied at R3, R5 or R3+R5 phenological states. Parameters assessed were: disease severity (at R6), foliar persistence (at early R7), crop yield (kg/ha), 1000-seed weight (g), seed emergence and seed infection (%). In the 2007/2008 season, all treatments were superior to the untreated control for disease control, crop yield, and 1000-seed weight. No statistically significant differences were found among treatments for yield and 1000-seed weight in the 2008/2009 season, whereas in the 2009/2010 and 2010/2011 seasons the only treatment that differed from the control in crop yield was the azoxystrobin + cyproconazole mix at R5. The trifloxystrobin + cyproconazole (at R3) and azoxystrobin + cyproconazole treatments (both at R3 and R5) differed from the control as regards 1000-seed weight in the 2009/2010 season, but no statistically significant differences were found among treatments in relation to this parameter in the 2010/2011 season. Fungicide applications generally decreased seed fungal infection, improved root emergence and increased crop yield, confirming that there are efficient active ingredients for the management of these diseases.

Keywords : pachyrhizi; late-season diseases; control; strobilurin; triazole.

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