Abstract
ABSTRACT Leaf rust (Puccinia triticina) is one of the most common diseases in wheat crops. For effective control of such disease, leaf application of mixtures of triazole and strobilurin fungicides is recommended. The aim of this study was to evaluate the efficacy of different fungicide formulations and numbers of applications in controlling wheat leaf rust in the cultivar TBIO Pioneiro 2010. Experimental design was completely randomized, 2x2 factorial arrangement, consisting of two fungicide formulations and two numbers of applications, as well as four replicates. Treatments were: azoxystrobin + tebuconazole, three and four applications; trifloxystrobin + prothioconazole, three and four applications; and a control treatment without fungicide application. For treatments with three applications, fungicides were applied at the phenological stages of: elongation, booting and flowering. For treatments with four applications, fungicides were applied at the phenological stages of: tillering, elongation, booting and flowering. The efficiency of fungicides on leaf rust control was analyzed based on the disease severity assessment by calculating the Area Under Disease Progress Curve (AUDPC). Severity data were obtained based on percentage scores of leaf area with visible disease symptoms/signs according to Cobb’s diagrammatic scale. Fungicides with azoxystrobin + tebuconazole and trifloxystrobin + prothioconazole showed efficient control of wheat leaf rust (higher than 85%). For yield components, there was no statistical difference between numbers of applications, but there was a statistical difference between fungicide formulations, except for grain yield. Furthermore, for yield components, all fungicide treatments significantly differed from control.
Highlights
A ferrugem da folha do trigo (Puccinia triticina) é uma das doenças mais frequentes em lavouras de trigo
Leaf treatment is preferred by means of application of mixtures of triazole and strobilurin fungicides at recommended doses (Reis et al (17))
The tested fungicide formulations showed a good control of wheat leaf rust, all above 85%
Summary
A ferrugem da folha do trigo (Puccinia triticina) é uma das doenças mais frequentes em lavouras de trigo. O objetivo deste estudo foi avaliar a eficácia das diferentes formulações fungicidas e do número de aplicações para o controle da ferrugem da folha do trigo na cultivar TBIO Pioneiro 2010. Wheat (Triticum aestivum L.) is an annual grass crop grown during the winter This crop is important in the composition of sustainable agricultural production systems as an alternative to winter rotation in production systems, contributing to integrated management of pests, diseases and weeds. Leaf treatment is preferred by means of application of mixtures of triazole and strobilurin fungicides at recommended doses (Reis et al (17)) Combination of these strategies or integration of cultural and genetic control, as well as the use of fungicides, would be the most effective ways to control this disease (Xue et al (18))
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