Eryngium foetidum, Petroselinum crispum and Coriandrum sativum: new apiaceae hosts of Oidiopsis taurica in Brazil

Reis, Ailton; Lopes, C. A.; Lima, Milton L. Paz; Boiteux, L. S.

doi:10.1590/s0100-41582004000300023

Cited by 2 publications

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“…These characteristics are similar to those reported by Salmon [22], Mosquera et al [23] and Glawe [24]. The conidia presented the following dimensions: 70 µm long × 18 µm wide for the lanceolate form and 65 µm long × 18 µm wide for the cylindrical form, similar to measures previously reported for L. taurica [25,26]. In the present study, no sexual spores (cleistothecia) were observed on infected leaves, as also reported by Jones et al [27] and Abdel-Azeem and Abdel-Moneim [28] who did not observe these structures.…”

Section: Identification Of the Causal Agent Of Powdery Mildew On Jala...supporting

confidence: 90%

Potential of Chitosan for the Control of Powdery Mildew (Leveillula taurica (Lév.) Arnaud) in a Jalapeño Pepper (Capsicum annuum L.) Cultivar

Jiménez-Pérez,

Gallegos-Morales,

Espinoza-Ahumada

et al. 2024

Plants

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One of the phytopathogens that cause severe damage to jalapeño pepper is Leveillula taurica (Lév.) Arnaud, the causative agent of powdery mildew. Synthetic fungicides are currently employed for its control, contributing to adverse effects on human health and the environment. The main objective of this research was to identify the causal agent of powdery mildew and assess the efficacy of chitosan in powdery mildew control on jalapeño pepper. The following treatments were evaluated in laboratory and greenhouse conditions: T1 = 0.0125% chitosan, T2 = 0.0025% chitosan, T3 = 0.05% chitosan, T4 = 0.1% chitosan, T5 = 0.2% chitosan, T6 = tebuconazole 25% (1.8 mL/L water), and T7 = control (water). Symptomatology results indicated that L. taurica is indeed the causative agent of powdery mildew. Treatments T4 and T5 exhibited the lowest percentages of incidences and severity, hence achieving higher control efficacy in the laboratory (57.70 ± 3.85 and 65.39 ± 3.85) and greenhouse (56.67 ± 4.08 and 70 ± 8.16%) compared to T6 (control efficacy, 38.46 ± 0.00% in the laboratory and 50 ± 0.00% in the greenhouse). The chitosan derived from shrimp had a significant impact on the cell walls of L. taurica spores and mycelium. Consequently, chitosan emerges as a viable organic alternative to fungicides for controlling powdery mildew in jalapeño pepper.

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Section: Identification Of the Causal Agent Of Powdery Mildew On Jala...supporting

confidence: 90%

Potential of Chitosan for the Control of Powdery Mildew (Leveillula taurica (Lév.) Arnaud) in a Jalapeño Pepper (Capsicum annuum L.) Cultivar

Jiménez-Pérez,

Gallegos-Morales,

Espinoza-Ahumada

et al. 2024

Plants

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Powdery mildew of Allium species caused by Oidiopsis taurica in Brazil

et al. 2004

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T he Alliaceae family comprises one of the leading groups of plants in terms of economic importance, including major vegetable crops such as garlic (Allium sativum L.), leek (A. porrum L. syn. A. ampeloprasum), onion (A. cepa L.), and bunching onion (A. fistulosum L.) (Brewster, 1994). In Brazil, these vegetables are primarily cultivated under open field conditions. However, seedlings for transplantation, plants employed in controlled crosses during breeding programs, and tissue culture-derived virus-free garlic plantlets are often cultivated under either greenhouse or plastic house conditions. REIS, A.; BOITEUX, L.S.; PAZ-LIMA, M.L.; SILVA, P.P.; LOPES C.A. Powdery mildew of Allium species caused by Oidiopsis taurica in Brazil. Horticultura Brasileira, Brasília, v.22, n.4, p.758-760, out-dez, 2004. (Maffia et al., 2002; Zambolim et al., 2000). However, an apparently undescribed powdery mildew disease was observed affecting a range of Allium species in distinct Brazilian growing regions. This disease was first noticed on garlic and leek accessions in Brasília (Federal District) and in field-grown onion cultivars in Belém do São Francisco (Pernambuco State) during successive growing seasons (from 2000 to 2003). In this work, the occurrence of a powdery mildew disease on Allium species in Brazil was described as being caused by the fungus Oidiopsis taurica Salmon (syn. O. sicula Scalia). Powdery mildew of MATERIAL AND METHODSOpen field-grown plants of leek showing atypical powdery mildew-like symptoms were collected in Brasília (Federal District). Similar symptoms ABSTRACTOidiopsis taurica Salmon (Syn. Oidiopsis sicula Scalia) was identified as the causal agent of a powdery mildew disease occurring on distinct Allium species in Brazil. This disease was initially observed in plastic house and field-grown garlic (Allium sativum) and leek (A. porrum) accessions in Brasília (Federal District) and in field-grown and greenhouse onion (A. cepa) cultivars in Belém do São Francisco (Pernambuco State) and Brasília, respectively. Typical symptoms consisted of chlorotic areas on the leaf surface corresponding to a fungal colony. These lesions turned to a brownish color with the progress of the disease. Fungi morphology was similar to that described for O. taurica. Endophytic mycelium emerging through estomata, light pale conidia were dimorphic (lanceolate primary conidia and somewhat cylindrical secondary conidia), fibrosin bodies were absent, conidia formed predominantly single (not in chains), and appressoria were non-lobed. Its sexual stage, Leveillula taurica (Lev.) Arnaud, was not observed. Inoculations were performed with the O. taurica isolates from distinct Allium hosts. These isolates were also pathogenic to sweet pepper and tomato, indicating an apparent absence of host specialization. One bunching onion (A. fistulosum) accessions was not infected by O. taurica suggesting that this species might carry useful resistance alleles to this pathogen. This is the first formal report of a powdery mildew disease on specie...

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Eryngium foetidum, Petroselinum crispum and Coriandrum sativum: new apiaceae hosts of Oidiopsis taurica in Brazil

Cited by 2 publications

References 0 publications

Potential of Chitosan for the Control of Powdery Mildew (Leveillula taurica (Lév.) Arnaud) in a Jalapeño Pepper (Capsicum annuum L.) Cultivar

Potential of Chitosan for the Control of Powdery Mildew (Leveillula taurica (Lév.) Arnaud) in a Jalapeño Pepper (Capsicum annuum L.) Cultivar

Powdery mildew of Allium species caused by Oidiopsis taurica in Brazil

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