Powdery Mildew Caused by <i>Erysiphe heraclei</i>: A Novel Field Disease of Carrot (<i>Daucus carota</i>) in Brazil

Boiteux, L. S.; Reis, Ailton; Fonseca, M. E. N.; Junior, V. Lourenço; Costa, Alexandre Florian da; Melo, Alessandra Gonçalves de; Borges, R. C. F.

doi:10.1094/pdis-01-17-0145-pdn

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Solheim) [24][25][26][27][28][29][30][31][32][33][34][35][36]. According to Boiteux et al [37] and Naqvi [38], powdery mildew (Erysiphe heraclei DC.) and downy mildew (Peronospora crustosa (Fr.)…”

Section: Introductionmentioning

confidence: 99%

The Influence of Trichoderma harzianum Rifai T-22 and Other Biostimulants on Rhizosphere Beneficial Microorganisms of Carrot

et al. 2020

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The principles of good agricultural and horticultural practice, which consider both giving environmental protection and high yielding of plants, require modern cultivation methods. Modern cultivation of horticultural plants uses, for example, cover crops, living mulches, plant growth-promoting microorganisms (PGPMs), plant growth regulators (PGRs) and other biostimulants protecting the soil against degradation and plants against phytopathogens and stress. The purpose of field and laboratory studies was to determine the effect of Trianum P (containing Trichoderma harzianum Rifai T-22 spores), Beta-Chikol (a.s.—chitosan), Timorex Gold 24 EC (based on tea tree oil) and fungicide Zaprawa Nasienna T 75 DS/WS (a.s.—tiuram 75%) on the health of carrot (Daucus carota L.) plants and the microorganism population in the rhizosphere of this plant. Moreover, the antagonistic effect of rhizosphere fungi on selected carrot fungal pathogens was determined. Laboratory mycological analysis allowed one to determine the qualitative and quantitative composition of fungi colonizing the underground parts of carrot plants. In addition, the total population of fungi and bacteria was determined (including Bacillus sp. and Pseudomonas sp.) based on the microbiological analysis of the rhizosphere soil. The application of the plant growth-promoting fungus (Trichoderma harzianum T-22), chitosan and tea tree oil positively influenced the growth, development and health status of carrot plants. T. harzianum T-22, chitosan and fungicide most effectively protected carrots against infection by soil-borne fungi from the genus Alternaria, Fusarium, Haematonectria, Sclerotinia and Rhizoctonia. The rhizosphere population of Bacillus sp. and Pseudomonas sp. in the treatments with Trianum P or Zaprawa Nasienna T 75 DS/WS was bigger than in the other experimental treatments. A reverse relationship was observed in the population of rhizosphere fungi. T. harzianum T-22, chitosan and tea tree oil promoted the growth of antagonistic fungi (Albifimbria sp., Clonostachys sp., Penicillium sp., Talaromyces sp. and Trichoderma sp.) in the carrot rhizosphere. Antagonistic activity of these fungi towards Alternaria dauci, Alternaria radicina, Sclerotinia sclerotiorum and Rhizoctonia solani was higher after the application of the preparations compared to control. Consequently, Trianum P, Beta-Chikol and Timorex Gold 24 EC can be recommended as plant biostimulants in ecological agricultural production, including Daucus carota cultivation.

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Section: Introductionmentioning

confidence: 99%

The Influence of Trichoderma harzianum Rifai T-22 and Other Biostimulants on Rhizosphere Beneficial Microorganisms of Carrot

et al. 2020

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“…There have been many examples of the occurrence of unexpected diseases in different crops in the last decades, as in the cases of java rose apple, common bean, monkshood, snapdragon, sunflower, Japanese persimmon, and soybean [36][37][38][39][40][41][42]. The appearances of powdery mildew in carrot caused by Erysiphe heraclei in Brazil [43] and in faba bean gall in Ethiopia [44] are recent examples of novel outbreaks for both the disease and the host of our study. This risk is even higher in the context of a changing climate [45,46].…”

Section: Discussionmentioning

confidence: 82%

Elucidating the Response of Diverse Faba Bean Genotypes to Powdery Mildew Infection

Villegas-Fernández,

García,

Barilli

et al. 2024

Agronomy

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Faba bean (Vicia faba) is a temperate grain legume of major importance for food and feed. Powdery mildews are an important group of diseases in many crops, although in faba bean, it is still considered to be of only minor and local relevance. Here, we report the occurrence of powdery mildew in southern Spain, which was identified through ITS sequencing as Erysiphe trifolii. Resistance screenings allowed the identification of a wide range of responses to the disease, with accessions BPL-710 and ILB-4708 outstanding due to their high levels of resistance. Histological studies showed that the mechanisms of resistance may involve the inhibition of germination and impairment of fungal development, as shown by a limited number of primary and secondary hyphae compared to those of the susceptible accessions. This work permitted a better understanding of the interaction of faba bean and powdery mildew, laying the ground for breeding programs for resistance if needed in the future.

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Prevalence of Berkeleyomyces basicola infections in black rot‐affected carrot determined using the MCM7 gene region

et al. 2022

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Carrot (Daucus carota) is an important vegetable grown around the word. In Brazil, carrots have been grown throughout the year in all geographic regions, with more than 20,000 hectares and half a million tonnes produced per year (Boiteux et al., 2017; CEPEA, 2021).Carrot cultivation is affected by several diseases that can cause quantitative and qualitative losses. Among the main diseases, black rot stands out particularly during the storage and commercialization of roots. Black rot infection in carrots is characterized by the appearance of dark necrotic lesions on the root surface. These symptoms can be observed in the field but develop mainly in the postharvest stages (Lopes & Reis, 2016;Paulin-Mahady et al., 2002).Black rot infection in carrot has been associated with species of Thielaviopsis. However, the taxonomy of the causal agent is confusing because the main taxon associated with the disease has undergone several reclassifications over time (de Beer et al., 2014;Nel et al., 2018). In the past, based on comparisons of morphological structures, the causal agent was named ambiguously as Chalara elegans or Thielaviopsis basicola (Dalbosco et al., 2004;Silva & Costa, 2013). This ambiguity is probably due to the use of morphological markers that are shared with other taxa belonging to the Ceratocystidaceae family. Paulin and Harrington (2000), using species-specific DNA sequences as phylogenetic markers, inferred that T. basicola grouped with several anamorphic species of Ceratocystis. Later, studies by the same authors suggested that Thielaviopsis should be considered the ideal genus to accommodate Chalara species. T. basicola has been proposed as the corresponding name for the aetiologic agent of black root rot (Paulin-Mahady et al., 2002).In 2014, phylogenetic analyses using DNA sequences from several genes showed that T. basicola belongs to a new phylogenetic lineage that does not group with any known genus in Ceratocystidaceae (de Beer et al., 2014). These multigenic analyses provided evidence that "T. basicola" is represented by two distinct phylogenetic lineages, reclassified as a new genus, named Berkeleyomyces, a new combination

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Powdery Mildew Caused by Erysiphe heraclei: A Novel Field Disease of Carrot (Daucus carota) in Brazil

Cited by 6 publications

References 4 publications

The Influence of Trichoderma harzianum Rifai T-22 and Other Biostimulants on Rhizosphere Beneficial Microorganisms of Carrot

The Influence of Trichoderma harzianum Rifai T-22 and Other Biostimulants on Rhizosphere Beneficial Microorganisms of Carrot

Elucidating the Response of Diverse Faba Bean Genotypes to Powdery Mildew Infection

Prevalence of Berkeleyomyces basicola infections in black rot‐affected carrot determined using the MCM7 gene region

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