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prof. Ing. Kamil Hudec, PhD.
Identification number: 1465
University e-mail: kamil.hudec [at]
professor CSc./PhD. - Department of Plant Protection (FAaFR)

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Basic information

Basic information about a final thesis

Type of thesis: Dissertation thesis
Thesis title:Fungicide resistance of Cercospora beticola in the Slovak Republic
Written by (author): Ing. Milan Mihók, PhD.
Department: Department of Plant Protection (FAaFR)
Thesis supervisor: prof. Ing. Kamil Hudec, PhD.
Opponent 1:Ing. Marek Barta, PhD.
Opponent 2:prof. Ing. Dana Tančinová, PhD.
Opponent 3:doc. Ing. Jozef Huszár, DrSc.
Final thesis progress:Final thesis was successfully defended.

Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:Slovak

Slovak        English

Title of the thesis:Fungicide resistance of Cercospora beticola in the Slovak Republic
Summary:Cercospora beticola Sacc. is one of the most important sugar beet pathogens. C. beticola causes Cercospora leaf spot and represents a significant economic problem for sugar beet growers worldwide. Frequent application of fungicides with same mode of action increases the risk of development of resistant strains of pathogen. This PhD Thesis has been conducted to study occurrence of C. beticola resistant isolates in Slovak republic, and to testing of fungicide efficacy against Cersospora leaf spot in field trials. In our study, the most intensive growth and sporulation of C. beticola isolates was recorded on TE agar (Tomato extract). The lowest growth and sporulation was observed on V8 agar. Among the temperatures, the highest sporulation was observed at 25 °C on all nutrition media. PDA was chosen as the most appropriate medium for in vitro fungicide resitance testing. The results of the fungicide resistance study confirmed the presence of fungicide resistant strains of the C. beticola in Slovak Republic. On base of value EC50, the most resistant isolates were proved to fungicides Topsin (thiophanate-methyl), Score (difenoconazole) and Acanto (picoxystrobin). The lower number of resistant isolates was recorded by fungicides Yamato, Sfera 525 SC, Amistar Xtra, Bumper Super, Eminent 125 ME and Juwel. Significant differences were observed in number of fungicide resistant isolates among localities. This study brought risk active ingredients for specific localities. It is important base for antiresistant strategy in the praxis. The highest fungicide efficacy against Cercospora leaf spot in field conditions was recorded by using of double fungicide treatment by fungicides Juwel + Eminent 125 ME. Other fungicide treatments are listed in descending order according to fungicide efficacy: Juwel + Score, Amistar Xtra + Score, Bumper Super + Eminent 125 ME, Plan Tonic + Plan Tonic Sfera 535 SC + Eminent 125 ME, Acanto + Eminent 125 ME. The highest economic efficiency of the fungicide treatments was recorded with the combination of Bumper Super + Eminent 125 ME fungicides.
Key words:fungicide resistance, Cercospora beticola, fungicide efficacy, sugar beet, morphology, isolates

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