Cucumber target spot control and Corynespora cassiicola inhibition by uni-and multi-site fungicides

Fischer, Ivan Herman; Morales, João Vitor Pelizzaro; Silva, Lucas Meleiro da; Parisi, Marise Cagnin Martins; Amorim, Lílian

doi:10.1016/j.cropro.2022.106073

Cited by 3 publications

(4 citation statements)

References 29 publications

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“…The fungicides chlorothalonil and metiram + pyraclostrobin, as well as boscalid + crezoxim-methyl and azoxystrobin + benzovindiflupyr, controlled the cucumber target spot in a previous study, when applied three or seven days before inoculation or one day after inoculation of the pathogen, being recommended preventive management as it results in greater disease control (Fischer et al, 2022b). According to the same authors, the efficiency of fungicides containing a strobilurin in their formulation, in controlling the target spot, is mainly due to the other active principle, since the concentration of strobilurin in the mixture was lower than the inhibitory concentration of 50% (IC50) corresponding.…”

Section: Resultsmentioning

confidence: 99%

“…According to the same authors, the efficiency of fungicides containing a strobilurin in their formulation, in controlling the target spot, is mainly due to the other active principle, since the concentration of strobilurin in the mixture was lower than the inhibitory concentration of 50% (IC50) corresponding. While chlorothalonil and metyram were highly efficient (IC50 < 1 mg/L) in inhibiting pathogen germination, pyraclostrobin was ineffective (IC50 > 100 mg/L) in vitro (Fischer et al, 2022b). Satisfactory control of the disease was also obtained under field conditions, with six applications of chlorothalonil (1,800 mg/L), at intervals of ten days (Blazquez, 1967).…”

Section: Resultsmentioning

confidence: 99%

“…The recommended measures for managing cucumber target spot are crop rotation, adoption of more resistant genotypes and spraying with fungicides recommended for alternaria and cercospora spots (Pavan et al, 2016), since there are no products registered in the Ministry of Agriculture, Livestock and Supply (MAPA) for disease control in cucumber (Agrofit, 2022). The fungicides chlorothalonil, metyram + pyraclostrobin, boscalid + crezoxim-methyl and azoxystrobin + benzovindiflupyr controlled the disease in preventive treatment in a greenhouse (Fischer et al, 2022b).…”

Section: Introductionmentioning

confidence: 99%

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Cucumber Response to Target Blot as a Result of the Effect of Products on Disease Control

Silva¹,

Firmino²,

Fileti³

et al. 2022

JASR

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Target spot, caused by Corynespora cassiicola, occurs in several cultivated species, being considered an important disease in cucumber. The objective was to evaluate the cucumber response to the target spot as a function of preventive management of the disease with fungicides and phosphites, associated or not with silicone adhesive spreaders. 'Soldier' cucumber plants were grown in 10 L pots in a greenhouse. Chlorothalonil and methiram + pyraclostrobin fungicides and potassium and zinc phosphites were evaluated, combined or not with Silwet L-77 Ag® and Break-Thru® adhesive spreaders, applied four days before pathogen inoculation. The severity of the disease was evaluated; the fresh and dry mass of the aerial part of the plants at 60 days after sowing; the number and fresh mass of fruits, and the number of leaves and plant height at intervals of 7 to 10 days from the inoculation of the pathogen. Fungicides were more efficient in controlling target spot, followed by zinc phosphite, while potassium phosphite did not differ from the inoculated control, which reached severity greater than 40%, 10 days after inoculation of the pathogen and more than 75% of dry leaves (2nd and 3rd true leaves), 25 days after inoculation. Greater fresh mass of the aerial part of the plants was observed with the fungicides, with no difference between the treatments for the other variables. Adhesive spreaders had no effect on the analyzed variables. Cucumber production was not affected by treatments up to 60 days of cultivation, despite the disease intensity being lower with fungicides and zinc phosphite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cucumber Response to Target Blot as a Result of the Effect of Products on Disease Control

Silva¹,

Firmino²,

Fileti³

et al. 2022

JASR

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“…Corynespora cassiicola is among the most widespread and damaging cucumber pathogens globally, causing target leaf spot disease (Figure 1) (Dixon et al 2009;Chau et al 2022). C. cassiicola is a pathogenic fungus with an extensive host range, capable of infecting hundreds of plant species besides cucumbers, such as tomato, soybean, rubber, cotton, and many others (Lu et al 2021;Ribeiro et al 2021;Zhao et al 2021;Fischer et al 2022;Khadka et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of antifungal activity against Corynespora cassiicola by bacteria isolated from soil in the root zone of cucumber plants

DUY

2023

Biodiversitas

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Abstract. Duy LQ. 2023. Evaluation of antifungal activity against Corynespora cassiicola by bacteria isolated from soil in the root zone of cucumber plants. Biodiversitas 24: 6584-6591. Target leaf spot caused by Corynespora cassiicola poses a major disease threat to cucumber cultivation worldwide. Reliance on chemical fungicides has raised resistance to environmental and health concerns. As cucumber production expands globally, sustainable solutions are needed. Plant Growth-Promoting Rhizobacteria (PGPR) show promise but remain underexplored against C. cassiicola in cucumber. This study aimed to assess the potency of rhizobacteria in antagonistic activity against C. cassiicola, causing cucumber target leaf spots under in vitro conditions. The present study isolated bacterial strains from cucumber soil rhizosphere and screened for antifungal activity against C. cassiicola using dual culture assays. Using quantitative assays, selected antagonistic strains were further assessed for key biocontrol traits, including ?-1,3-glucanase, chitinase, and siderophore production. Cell-free supernatants were tested for direct fungal growth inhibition using the environmental toxicity. Isolated PGPR strains showed robust C. cassiicola inhibition from 39.8% to 62.6% growth reduction. Most antagonistic isolates produced ?-1,3-glucanase, chitinase, and siderophores and suppressed pathogen growth via metabolites in their supernatants. These results demonstrate multiple biocontrol mechanisms, including enzymatic degradation of fungal cell walls, iron competition through siderophores, and antimicrobial compound secretion. Bacillus siamensis strain TV16 exhibited the strongest overall antagonism against C. cassiicola. These findings reveal the biocontrol potential of PGPR for managing cucumber-target leaf-spot disease, offering a sustainable alternative to chemical pesticides. With further optimization and field testing, PGPR-based biopesticides can be integrated into cucumber production to improve crop health while reducing fungicide reliance.

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Resistance risk assessment of mefentrifluconazole in Corynespora cassiicola and the control of cucumber target spot by a two-way mixture of mefentrifluconazole and prochloraz

Peng,

Li,

et al. 2024

Pesticide Biochemistry and Physiology

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Cucumber target spot control and Corynespora cassiicola inhibition by uni-and multi-site fungicides

Cited by 3 publications

References 29 publications

Cucumber Response to Target Blot as a Result of the Effect of Products on Disease Control

Cucumber Response to Target Blot as a Result of the Effect of Products on Disease Control

Evaluation of antifungal activity against Corynespora cassiicola by bacteria isolated from soil in the root zone of cucumber plants

Resistance risk assessment of mefentrifluconazole in Corynespora cassiicola and the control of cucumber target spot by a two-way mixture of mefentrifluconazole and prochloraz

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