Abstract

LOVATO ECHEVERRIA, Alfonso D; GUTIERREZ, Susana A  and  CARMONA, Marcelo A. In vitro susceptibility of Trichoconiella padwickii to various active ingredients used as fungicides in the cultivation of rice. Rev. argent. microbiol. [online]. 2017, vol.49, n.1, pp.100-115. ISSN 0325-7541.  http://dx.doi.org/10.1016/j.ram.2016.11.002.

The aim of this study was to evaluate in vitro the mycelial susceptibility of Trichoconiella padwickii to different active ingredients through average median concentration IC₅₀ calculation. Inoculum disks were seeded on bean agar at different concentrations (0.1; 1; 10; 30, 50; 100 and 1000 mg/l) of various fungicides. After seven days the colony diameter was measured. The data obtained were fitted to nonlinear regression models. Susceptibility was classified using the scale proposed by Edgington. The results show that the pathogen is very sensitive to products that act on the respiratory chain (quinone outside inhibitors QoI and succinate dehydrogenase inhibitors SDHI) and cell membrane (multi-site contact activity), and moderately sensitive to those products interfering with cell division (methyl benzimidazole carbamates MBC), synthesis of nucleic acids (phenylamides PA) and osmotic signal transduction (multi-site contact activity). This work is the first record on the sensitivity of T. padwickii.

Keywords : Seed-borne pathogen; IC₅₀; Fungicides.

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