Effect of fungicides commonly used for Fusarium head blight management on growth and fumonisin production by Fusarium proliferatum

CENDOYA E.; NICHEA M.J.; MONGE MP; ZACHETTI V.G.L.; CHIACCHIERA S.M.; RAMIREZ M L

REVISTA ARGENTINA DE MICROBIOLOGíA

ASOCIACION ARGENTINA MICROBIOLOGIA

Lugar: Buenos Aires; Año: 2021 vol. 53 p. 64 - 74

0325-7541

Fumonisin occurrence was reported in wheat grains and F. proliferatum has beensuggested to be the main contributor to its presence in wheat. Thus, a survey was performed in order to study the impact of four commercial fungicides used in Argentina for controlling Fusarium head blight disease (epoxiconazole + metconazole, tebuconazole, pyraclostrobin + epoxiconazole, and prothioconazole) on growth and fumonisin production of two F. proliferatum strains in relation to water activity (aW; 0.99, 0.97, 0.95) and temperature (15 ◦Cand 25 ◦C). Most fungicides reduced growth rates when compared to the control (reduction increased as fungicide concentration increased), and reduced fumonisin production when they were used at high doses; however, most fungicides enhanced fumonisin production at sublethal doses, with the exception of prothioconazole. Thus, fungicides used for FHB management could enhance fumonisin production by F. proliferatum strains present in wheat grains.