Effect of various fungicides in the control of Alternaria leaf blight in carrot crops

Töfoli, Jesus Guerino; Domingues, Ricardo José; Tortolo, M

doi:10.31368/1980-6221v81a10010

Cited by 6 publications

(9 citation statements)

References 5 publications

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“…While inspecting the internal infestation of seeds, the settlements of fungi were counted to get the percentage of dominating fungi in the treatment after 2, 5, and 7 days of incubation (DOI). Visual and microscopical fungi identification was made based on morphological and cultural characteristics typical to the colonies [17,39]. Their detection frequency was determined using the detection rate of micromycetes: less than 30%-random species, more than 30%-typical species, more than 50%-dominant species [40].…”

Section: Determination Of Predominant Fungimentioning

confidence: 99%

“…was calculated based on the number of grown fungal colonies in each plate after 2, 5, and 7 DOI. Fungi were identified according to cultural and morphological characteristics typical to the colonies [17,39]. Essential oils effect on Alternaria species was evaluated according to the disease incidence using the formula below (1) [12]: Alternaria spp.…”

Section: Essential Oils Efficacy Assaymentioning

confidence: 99%

“…Seed-borne diseases can be controlled by selecting resistant varieties, production technology, seed treatments and dressings, and soil disinfection [13]. Over the last several decades, seed and soil or foliar treatments with synthetic chemicals have been shown to prevent plant disease epidemics caused by seed-borne fungi [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Control of Seed-Borne Fungi by Selected Essential Oils

2022

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Seed-borne pathogens reduce the quality and cause infections at various growth stages of horticultural crops. Some of the best-known are fungi of genus Alternaria, that cause destructive vegetable and other crop diseases, resulting in significant yield losses. Over several years, much attention has been paid to environmentally-friendly solutions for horticultural disease management regarding the environmental damage caused by chemicals. For example, plant extracts and essential oils could be alternative sources for biopesticides and help to control vegetable seed-borne pathogens. This study aimed to evaluate essential oils’ influence on the growth of seed-borne fungi Alternaria spp. The microbiological contamination of vegetable seeds (carrot, tomato, onion) was determined by the agar-plate method. The essential oils’ impact on the growth of fungi was evaluated by mixing them with PDA medium at different amounts. The hydrodistillation was used for extraction of thyme and hyssop essential oils, and common juniper essential oil was purchased. The investigation revealed that the highest contamination of carrot and tomato seeds was by Alternaria spp. fungi. Furthermore, the highest antifungal effect on Alternaria spp. growth was achieved using 200–1000 μL L−1 of thyme essential oil. Meanwhile, the antifungal effect of other investigated essential oils differed from low to moderate. Overall, essential oils expressed a high potential for fungal pathogens biocontrol and application in biopesticides formulations.

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Section: Determination Of Predominant Fungimentioning

confidence: 99%

Section: Essential Oils Efficacy Assaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Control of Seed-Borne Fungi by Selected Essential Oils

2022

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“…Types of fungus were determined visually and microscopically based on cultural and morphological characteristics typical to the colonies [10,23].…”

Section: Essential Oils Effect On Pathogensmentioning

confidence: 99%

“…Seed-borne diseases can be managed by various strategies including chemical, cultural and technological methods [6]. In the past few decades, chemicals are widely used for treatment as a potent approach toward disease control, and the usage of chemical fungicides added further possibilities to it [7][8][9][10]. Nevertheless, pesticides pose distinct risks to the organic production of carrot seeds, because the use of effective chemical fungicides to resist foliar and leaf blight is not allowed.…”

Section: Introductionmentioning

confidence: 99%

Control of Carrot Seed-Borne Pathogens by Aromatic Plants Distillates

Lukošiūtė

Rasiukevičiūtė

Valiuškaitė

2020

The 1st International Electronic Conference on Plant Science

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Global warming, pollution problems, and the demand for sustainable food production forced farmers and scientists to search for new solutions in biological plant protection. The usage of natural renewable sources around us seems to be an alternative. Compounds isolated from plants and distinguished with antifungal properties can be used to protect vegetables from the seed-borne pathogens. The study aimed to elucidate the ability of Juniperus communis L., Hyssopus officinalis L. and Thymus vulgaris L. essential oils to control the carrot seed-borne pathogen Alternaria spp. The agar-plate method was used for carrot seed infestation with micromycetes. Essential oils extracted from common juniper, hyssop and thyme were then separately mixed with potato dextrose agar media at different concentrations and the antifungal activity of each oil tested in vitro. The results revealed that the T. vulgaris essential oil (200–1000 μL L−1) significantly inhibited Alternaria spp. growth. The H. officinalis essential oil promoted seed-borne pathogens growth on the second and fifth days of the evaluation compared to the control; however, the concentration of 400 μL L−1 showed little suppression of micromycete development 7 days after inoculation. The in vitro experiments indicated that 600 μL L−1 of J. communis essential oil could control seed-borne pathogen viability. Overall, thyme essential oil expressed a high potential for application in biofungicide formulations.

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Health status of carrots Daucus carota L. ssp. sativus grown in integrated and organic farming systems

Cwalina-Ambroziak¹,

Tyburski²

2022

asphc

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Carrot culrivars ‘Bolero’, ‘Fayette F1’, ‘Flakke, Koral’, ‘Nantes’, ‘Perfekcja’ and ‘Sukces’ were grown in integrated and organic farming systems. The severity of Alternaria leaf blight and root diseases was evaluated at harvest and after five months of storage. Fungi were isolated from carrot roots. Disease severity was affected by the years of the study, farming system and cultivar. The severity of Alternaria leaf blight was lower in the integrated farming system than in the organic system. Carrots of cvs. ‘Bolero’ and ‘Fayette F1’ were healthiest. In both production systems, the symptoms of mixed rot (soft rot, Pectobacterium carotovorum subsp. carotovorum and Sclerotinia rot, Sclerotinia sclerotiorum), dry rot (Fusarium spp.), common scab (Streptomyces scabies), crater rot (Rhizoctonia carotae) and black rot (Alternaria radicina, A. dauci) were encountered sporadically, and their severity was low on carrot roots analyzed at harvest. Disease symptoms became more severe during storage, and they were more frequently observed on carrot roots in the organic farming system. Cultivars exerted varied effects on the severity of the analyzed root diseases. The fungal pathogens isolated from carrot roots confirmed the presence of disease symptoms.

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Effect of various fungicides in the control of Alternaria leaf blight in carrot crops

Cited by 6 publications

References 5 publications

Control of Seed-Borne Fungi by Selected Essential Oils

Control of Seed-Borne Fungi by Selected Essential Oils

Control of Carrot Seed-Borne Pathogens by Aromatic Plants Distillates

Health status of carrots Daucus carota L. ssp. sativus grown in integrated and organic farming systems

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