RESUMOPalavras-chave adicionais: força de glúten, estrobilurinas, nitrogênio, Triticum sativum, Puccinia recondita, manchas foliares.The study was structured to determine the necessary factors, from the point of view of chemical control of foliar diseases, to obtain high quality wheat for bread production. The experiment in randomized blocks with six replicates tried to clarify the interaction between twelve cultivars and seven fungicide application programs, as well as its implications in the yield and quality of wheat grains. The results showed that the effects provided by fungicides in disease control, and their direct effects on the physiology of wheat plants, were decisive factors for obtaining highquality wheat. The results also showed that diseases compromise the Navarini, L.; Balardin, R.S. Foliar diseases and control by fungicides on yield and quality of wheat grains. Summa Phytopathologica, v.38, n.4, p.294-299, 2012. remobilization of nitrogen from leaves to grains. The differences between strobilurins and triazoles were evident in the control of leaf spot and leaf rust, in which triazole fungicides were more effective in controlling the leaf spot complex, when compared to strobilurins. However, effective control of wheat leaf rust was provided by strobilurins. The phenological stages of elongation and emission of spikes are critical times for the chemica l control of leaf spot u nder conditions of monoculture. In addition, the fungicide application after flowering is essential for the appropriate management of lea f rust.O estu do foi estru tu ra do no intu ito de determina r os fa tores, d o p o n t o d e v ist a d o m a n ej o q u ím i c o d e d o en ç a s fo l i a re s, necessários pa ra obtençã o de trigo com qua lidade de panificação. O ex pe rim en to em b lo cos a o a ca so c om se is r epe ti çõ es bu sc ou escla recer a intera çã o entre doze cu ltiva res e sete progra ma s de a p li ca çã o de fu ng ic id a s e su a s i mp li ca çõ es n a p ro du ti vi da de e qua lida de de grãos de trigo. Os resulta dos obtidos mostra ra m qu e os efeitos proporcionados pelos fungicidas, no controle de doenças, e seus efeitos diretos na fisiologia de plantas de trigo, foram fatores d e te r m i n a n t e s p a r a ob t e Additional keywords: gluten strength, strobilurins, nitrogen, Triticum sativum, Puccinia recondita, leaf spots.
ABSTRACTO clima, fator preponderante no aparecimento e evolução das doenças na cultura do trigo, influencia sobremaneira o potencial de dano e o tipo de doenças que proporcionam perdas econômicas e dificultam a produção. Considerando que os invernos da região sul do Brasil são predominantemente chuvosos e com temperaturas amenas a altas, a ocorrência de ferrugem da folha do trigo (Puccinia recondita Rob. ex. Desm. f.sp.