O.D.Schlösser, D.N.Follmann, A.C.Pereira, A.D.Lúcio, E.D.dos Santos, E.A.Moresco, F.M.Mieth, L.S.Stefanello, J.Bisognin, J.S.Parcianello, T.Olivoto and G.B.da Rosa
Published September 30, 2024
Genet. Mol. Res. 23 (3): gmr2356
DOI http://dx.doi.org/10.4238/gmr2356
About the Authors
O.D.Schlösser, D.N.Follmann, A.C.Pereira, A.D.Lúcio, E.D.dos Santos, E.A.Moresco, F.M.Mieth, L.S.Stefanello, J.Bisognin, J.S.Parcianello, T.Olivoto and G.B.da Rosa
Corresponding author:
G.B.da Rosa
E-mail: guilhermerosa.agro@gmail.com
ABSTRACT
Maize cultivation has major economic and social importance in Brazil. Being able to identify and manage fungal diseases is one of the main aspects related to good cultivation practices. The purpose of this study was to evaluate the efficiency of using the digital assessment of Helminthosporium disease, associated with the use of preventive fungicide in maize hybrids in low-altitude environments in southern Brazil, in a year with the presence of the La Niña phenomenon. The experiments were conducted in the municipalities of Santa Maria – RS and São Vicente do Sul – RS in the 2021/2022 harvest. The experimental design used was randomized blocks, with treatments in an 8 x 2 factorial scheme, consisting of eight maize hybrids, with and without fungicide application, in a subdivided plot, with fungicide application in bands. Low rainfall and lower disease inoculum pressure have contributed to reducing the severity of the Helminthosporium disease and the rate of disease progression in maize cultivation. The methods for measuring severity digitally and via diagrammatic scale were similar. The use of preventive fungicide in maize cultivation at the V8 and pre-flowering stages did not show positive results for grain yield. Grain length, number of rows per ear, and grain weight per ear are characters that have a high magnitude of association with grain yield in maize cultivation with and without fungicide application in years with the presence of the La Niña phenomenon.
Key words: Zea mays L.; Diagrammatic scales; preventive fungicide.