Occurrence of Cercospora beticola Sacc populations resistant to benzimidazole, demethylation-inhibiting, and quinone outside inhibitors fungicides in Morocco

Housni, Zakariae El; Tahiri, Abdessalem; Ezrari, Said; Radouane, Nabil; Ouijja, Abderrahman

doi:10.1007/s10658-022-02589-5

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…Multi applications of the same fungicides, by using full or reduced doses, usually lead to the selection of resistant strains of C. beticola (Karaoglanidis et al 2001). The fungicide efficacy is usually higher by preventive treatment, especially for trifloxystrobin, difenoconazole, and epoxiconazole (El Housni et al 2023). For better CLS management, the using of tank-mixes of different fungicides is needed (Khan & Smith 2005).…”

Section: Resultsmentioning

confidence: 99%

The Efficacy of Fungicides Against Cercospora beticola in Field Conditions

Hudec,

Mihók,

Roháčik

2023

Agriculture (Pol'nohospodárstvo)

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This study is focused on the evaluation of the efficacy of conventional fungicides against Cercospora leaf spot (CLS) on sugar beet. The results showed that the best protection against CLS was achieved by treatment with kresoxim-methyl + epoxiconazole (T1) and tetraconazole (T2). The second highest fungicide efficacy was detected after treatment with (kresoxim-methyl + epoxiconazole -T1) + difenoconazole -T2, followed by (azoxystrobin + cyproconazole) + difenoconazole, (prochloraz + propiconazole) + tetraconazole, Urtica dioica plant extracts + Salix spp. plant extracts, (trifloxystrobin + cyproconazole) + tetraconazole, and picoxystrobin + tetraconazole. The positive effect of fungicide protection on yield and sugar content was higher in the year with a higher occurrence of CLS. Good CLS management could increase the root yield by up to 19.34%, and sugar yield by up to 23.83% in comparison to the untreated check. The highest sugar yield was achieved in the treatment by (prochloraz + propiconazole) + tetraconazole, followed by (kresoxim-methyl + epoxiconazole) + difenoconazole, (azoxystrobin + cyproconazole) + difenoconazole, (trifloxystrobin + cyproconazole) + tetraconazole, picoxystrobin + tetraconazole, and Urtica dioica plant extracts + Salix spp. plant extracts. The results showed a strong relationship of root yield and sugar yield on fungicide treatment during the vegetation. The occurrence of fungicide resistance in Cercospora beticola population has an important impact on efficacy of applied fungicides in field conditions. The highest economic effectiveness coefficient was achieved at treatment by (prochloraz + propiconazole) + tetraconazole.

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Section: Resultsmentioning

confidence: 99%

The Efficacy of Fungicides Against Cercospora beticola in Field Conditions

Hudec,

Mihók,

Roháčik

2023

Agriculture (Pol'nohospodárstvo)

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“…A sustainable approach involving biological solutions appears to be effective against C. beticola, particularly in preventive measures. This has been demonstrated with Pythium oligandrum, a mycoparasite used to control fungal diseases, showing a remarkable preventive efficacy of 87% [55]. Examining the possible correlations among various bacterial species [56] or fungal-bacterial antagonists [57,58] holds promise, particularly when these combinations demonstrate additive or synergistic effects.…”

Section: Discussionmentioning

confidence: 99%

Evaluating Rhizobacterial Antagonists for Controlling Cercospora beticola and Promoting Growth in Beta vulgaris

El Housni,

Ezrari,

Radouane

et al. 2024

Microorganisms

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Cercospora beticola Sacc. is an ascomycete pathogen that causes Cercospora leaf spot in sugar beets (Beta vulgaris L.) and other related crops. It can lead to significant yield losses if not effectively managed. This study aimed to assess rhizosphere bacteria from sugar beet soil as a biological control agent against C. beticola and evaluate their effect on B. vulgaris. Following a dual-culture screening, 18 bacteria exhibiting over 50% inhibition were selected, with 6 of them demonstrating more than 80% control. The bacteria were identified by sequencing the 16S rRNA gene, revealing 12 potential species belonging to 6 genera, including Bacillus, which was represented by 4 species. Additionally, the biochemical and molecular properties of the bacteria were characterized in depth, as well as plant growth promotion. PCR analysis of the genes responsible for producing antifungal metabolites revealed that 83%, 78%, 89%, and 56% of the selected bacteria possessed bacillomycin-, iturin-, fengycin-, and surfactin-encoding genes, respectively. Infrared spectroscopy analysis confirmed the presence of a lipopeptide structure in the bacterial supernatant filtrate. Subsequently, the bacteria were assessed for their effect on sugar beet plants in controlled conditions. The bacteria exhibited notable capabilities, promoting growth in both roots and shoots, resulting in significant increases in root length and weight and shoot length. A field experiment with four bacterial candidates demonstrated good performance against C. beticola compared to the difenoconazole fungicide. These bacteria played a significant role in disease control, achieving a maximum efficacy of 77.42%, slightly below the 88.51% efficacy attained with difenoconazole. Additional field trials are necessary to verify the protective and growth-promoting effects of these candidates, whether applied individually, combined in consortia, or integrated with chemical inputs in sugar beet crop production.

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“…These included substances belonging to the same chemical groups as the preparations used in the present research, e.g., triazoles, strobilurins. Varying active ingredients between successive treatments or combining the use of several substances is justified by the desire to reduce the risk of facilitating the development of pathogenic resistance [44]. A long-term study of various active ingredients in many locations is also the basis for their comprehensive assessment and possible decisions to withdraw them from further use [45].…”

Section: Discussionmentioning

confidence: 99%

Fungicidal Protection as Part of the Integrated Cultivation of Sugar Beet: An Assessment of the Influence on Root Yield in a Long-Term Study

Jaskulska

Kamieniarz²,

Jaskulski

et al. 2023

Agriculture

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Despite the major role of non-chemical treatments in integrated plant protection, fungicides often need to be applied as a crop protection treatment in sugar beet farming. They should be used based on a good understanding of the requirements and effectiveness of the active ingredients. In 11-year field experiments, the effect that one and three foliar applications of fungicides containing various active ingredients (triazoles, benzimidazoles, strobilurines) had on sugar beet root yields was assessed, depending on various thermal and rainfall conditions. It was found that in eight of the 11 years, foliar application of fungicides increased yields compared to unprotected plants, and three foliar treatments during the growing season were more effective than a single application. The negative correlation of the root yield of fungicidally protected plants with total June rainfall was weaker than the same relationship for unprotected plants. At the same time, the positive correlation between the yield of fungicidally protected sugar beets and average June air temperature was stronger than the same relationship for unprotected plants. The research results indicate the need to conduct long-term field experiments and to continuously improve integrated production principles for sugar beet, especially regarding the rational use of pesticides.

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Occurrence of Cercospora beticola Sacc populations resistant to benzimidazole, demethylation-inhibiting, and quinone outside inhibitors fungicides in Morocco

Cited by 5 publications

References 32 publications

The Efficacy of Fungicides Against Cercospora beticola in Field Conditions

The Efficacy of Fungicides Against Cercospora beticola in Field Conditions

Evaluating Rhizobacterial Antagonists for Controlling Cercospora beticola and Promoting Growth in Beta vulgaris

Fungicidal Protection as Part of the Integrated Cultivation of Sugar Beet: An Assessment of the Influence on Root Yield in a Long-Term Study

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