Tolerance of triazole-based fungicides by biocontrol agents used to control Fusarium head blight in wheat in Argentina

PALAZZINI J.; TORRES, ADRIANA; CHULZE SN.

LETTERS IN APPLIED MICROBIOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018 p. 434 - 438

0266-8254

Fusarium head blight (FHB) caused by Fusarium graminearum species complex is a devastating disease that causes extensive yield and quality losses to wheat around the world. Fungicide application and breeding for resistance are among the most important tools to counteract FHB. Biological control is an additional tool that can be used as part of an integrated management of FHB. Bacillus velezensis RC 218, Brevibacillus sp. RC 263 and Streptomyces sp. RC 87B were selected by their potential to control FHB and deoxynivalenol production. The aim of this work was to test the tolerance of these biocontrol agents to triazole-based fungicides such as prothioconazole, tebuconazole andmetconazole. Bacterial growth was evaluated in Petri dishes using the spread plating technique containing the different fungicides. Bacillus velezensis RC 218 and Streptomyces sp. RC 87B showed better tolerance to fungicides than Brevibacillus sp. RC 263. Complete growth inhibition was observed at concentrations of 20 lg ml 1 for metconazole, 40 lg ml1 for tebuconazole and 80 lg ml 1 for prothioconazole. The results obtained indicate thepossibility of using these biocontrol agents in combination with fungicides as part of an integrated management to control FHB of wheat.