Fungicidal protection of winter wheat against the fungus Pyrenophora tritici-repentis
Keywords:
winter wheat, tan spot of wheat, biological fungicides, chemical fungicides, compatibility of preparations, effectiveness of fungicidesAbstract
The most widely used approach for controlling plant diseases, including tan spot of wheat (caused by Pyrenophora tritici-repentis), is the application of fungicides. The objective of this study was to evaluate the efficacy of biological fungicides in suppressing the development of P. tritici-repentis both in vitro and under field conditions, as well as to assess their compatibility with highly effective synthetic fungicides. Field assessments revealed that the biological effectiveness of microbiological preparations ranged from 38 % to 57 %, whereas that of chemical preparations ranged from 56 % to 98 %. In vitro inhibitory activity of the microbiological preparations against the pathogen was high, varying between 61 % and 72 %. Compatibility testing of biological and synthetic fungicides demonstrated that Pseudobacterin-3, (based on a Pseudomonas strain) was compatible with all tested chemical products except Magnello (difenoconazole, 100 g/l and tebuconazole, 250 g/l). Preparations based on Bacillus spp. exhibited variable compatibility with synthetic fungicides. Among these, Fitosporin-M, showed compatibility with the maximum number of chemicals (11 out of 14), while Orgamica C, was compatible with eight preparations. In contrast, microbial preparations based on Trichoderma strains did not show compatibility with any of the synthetic fungicides tested. These findings may be useful for the development of effective integrated pest management strategies against tan spot of wheat.
