The sensitivity of phytopathogenic fungi of genera Bipolaris and Fusarium to fungicides of different chemical composition

In vitro the sensitivity of isolated from wheat phytopathogenic fungi of genera Bipolaris and Fusarium to the fungicides of different chemical composition was studied using test based on the conidia germination. Five commercial fungicides based on tebuconazole, tebuconazole and thiabendazole, tebuconazole and prothioconazole, tebuconazole and imazalil, thiabendazole and flutriafol were used in two concentrations: the concentration recommended by the manufacturer and 25% of the recommended concentration. In order to reveal individual antifungal effects of tebuconazole, thiabendazole, prothioconazole, imazalil and flutriafol the results were analyzed using multiple linear regression. Totally 14 linear regression models (7 for Bipolaris and 7 for Fusarium) were built and 7 of them were statistically significant at the significance level from p2) from 0.936 to 0.997. Analysis of the regression coefficients for individual substances showed that the most effective fun- 3 gicides against phytopathogenic fungi of genera Bipolaris and Fusarium are imazalil and thiabendazole, whereas tebuconazole and prothioconazole demonstrates only weak effect, and flutriafol stimulates growth and development of these pathogens. Among tested preparations only Scarlet (60 g/L tebuconazole and 100 g/L imazalil) provides 100% suppression ofconidia germination when used both in the recommended concentration and in the concentration 25% of the recommended.