Agriculture & Food, Volume 10, 2022

Abstract: Pythyum debarianum is the most common causing agent of the damping off disease in the tobacco seedlings production. Propamocarb was a dominant in the suppression of this pathogen, but now, there are fungicides with its different content, but also in combination with other active ingredients. The aim of this study was to evaluate the efficacy of Propamocarb and its combinations with other active substances, in vitro. These are: Propamocarb 722 g / l (trade name Proplant 722 SL); Propamocarb 530 g / l + Fosetyl-Al 310 g / l (Previcur Energy); Propamocarb 400 g / l + Cymoxanil 50 g / l (Proxanil); Propamocarb 625 g / l + Fluopicolid 62.5 g / l (Infinito). The fungicidal / fungistatic effect (in an appropriate degree) of the tested fungicides was also determined. The study was performed using Poisoned food technique. The experiment was repeated 3 times, with 5 replications for each variant, with daily measurements of the colony՚s diameter. The efficacy and the corresponding effect were evaluated on the third but also, on the seventh day. The fungicide Infinito achieved excellent results in control of P. debarianum - 92% effectiveness. The weakest results were achieved by Proxanil, i.e. only 47% effectiveness. Proplant 722 SL and Previcur Energy gave average results (69.00 and 73%, respectively). No combination of Propamocarb has any in vitro fungicidal action. The fungicide Infinito has a strong fungistatic effect which is only slightly reduced during the test period. Proplant 722 SL and Previcur Energy showed a weak (and very weak) fungistatic effect on this pathogen. The obtained results would be of particular importance in determining the effect of Propamocarb and / or the most effective combination with other active ingredients in the control of this pathogen. At the same time, it would be in addition to expanding the list of fungicides that can be used to protect tobacco seedlings from the damping off disease caused by P. debarianum.