Managing <i>Colletotrichum</i> on Fruit Crops: A “Complex” Challenge

Dowling, Madeline Elizabeth; Peres, Natália A.; Villani, Sarah; Schnabel, Guido

doi:10.1094/pdis-11-19-2378-fe

Cited by 130 publications

(104 citation statements)

References 143 publications

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“…Fungal species belonging to the Colletotrichum genus are characterized by a global distribution associated with anthracnose diseases affecting a wide range of hosts, including many tree crops [ 5 , 58 , 59 , 60 ]. Although numerous species of Colletotrichum have been associated with the olive crop, these studies have focused on specific producing regions and lack an overall view [ 4 , 5 , 23 , 24 , 31 ].…”

Section: Discussionmentioning

confidence: 99%

“…Several Colletotrichum species can produce infections in a single host, showing high pathogenic specialization; much more frequent, however, are the Colletotrichum species with the ability to infect multiple hosts [ 58 , 60 ]. These antecedents suggest that correct taxonomic identification of Colletotrichum species is essential to avoid etiological ambiguities.…”

Section: Discussionmentioning

confidence: 99%

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Diversity of Colletotrichum Species Associated with Olive Anthracnose Worldwide

Moral

Agustí-Brisach

Raya

et al. 2021

JoF

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Olive anthracnose caused by Colletotrichum species causes dramatic losses of fruit yield and oil quality worldwide. A total of 185 Colletotrichum isolates obtained from olives and other hosts showing anthracnose symptoms in Spain and other olive-growing countries over the world were characterized. Colony and conidial morphology, benomyl-sensitive, and casein-hydrolysis activity were recorded. Multilocus alignments of ITS, TUB2, ACT, CHS-1, HIS3, and/or GAPDH were conducted for their molecular identification. The pathogenicity of the most representative Colletotrichum species was tested to olive fruits and to other hosts, such as almonds, apples, oleander, sweet oranges, and strawberries. In general, the phenotypic characters recorded were not useful to identify all species, although they allowed the separation of some species or species complexes. ITS and TUB2 were enough to infer Colletotrichum species within C. acutatum and C. boninense complexes, whereas ITS, TUB2, ACT, CHS-1, HIS-3, and GADPH regions were necessary to discriminate within the C. gloesporioides complex. Twelve Colletotrichum species belonging to C. acutatum, C. boninense, and C. gloeosporioides complexes were identified, with C. godetiae being dominant in Spain, Italy, Greece, and Tunisia, C. nymphaeae in Portugal, and C. fioriniae in California. The highest diversity with eight Colletotrichum spp. was found in Australia. Significant differences in virulence to olives were observed between isolates depending on the Colletotrichum species and host origin. When other hosts were inoculated, most of the Colletotrichum isolates tested were pathogenic in all the hosts evaluated, except for C. siamense to apple and sweet orange fruits, and C. godetiae to oleander leaves.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Diversity of Colletotrichum Species Associated with Olive Anthracnose Worldwide

Moral

Agustí-Brisach

Raya

et al. 2021

JoF

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“…Although various methods have been tested against pathogens, chemical control remains the gold standard to treat anthracnose [5].…”

Section: Introductionmentioning

confidence: 99%

“…cause anthracnose in guarana plants, characterized by leaf blight followed by defoliation. Under favorable conditions, acervuli develop inside the necrotic lesions, producing a conidial mass [ 5 ]. Mature or older leaves are not affected.…”

Section: Introductionmentioning

confidence: 99%

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Endophytic Colletotrichum siamense for Biocontrol and Resistance Induction in Guarana Seedlings

Casas

Pereira

Costa-Neto

et al. 2021

International Journal of Microbiology

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Paullinia cupana var. sorbilis, known in Brazil as guarana plant, is an important plant and a major traditional crop in the State of Amazonas. It is a native Brazilian species of great economic and social importance, particularly in the Amazon region. Anthracnose caused by Colletotrichum spp. is the main challenge for this crop. Therefore, the present study verified whether C. siamense, an endophytic fungus infected with a mycovirus, could protect the seedlings and reduce or eliminate the characteristic symptoms. Total proteins and enzymatic activities of pathogenesis-related proteins (PRPs), including peroxidase (POX), chitinase (CHI), and phenylalanine ammonia lyase (PAL), were quantified. Guarana seedlings of cultivar Maués were sprayed with a C. siamense conidia suspension (5.0 × 103 conidia/mL). After ten days, the seedlings were sprayed with a suspension of the phytopathogen’s conidia (1.0 × 106 conidia/mL). One group of these seedlings received the fungicide indicated for this crop. The fungicide was applied twice with an interval of 15 days between applications. Negative control seedlings did not receive any treatment (except water and fertilization), and positive control seedlings were treated only with the phytopathogen. The experiment was conducted between December 2019 and February 2020 in a greenhouse. The treatments were applied at an average temperature of 25°C and 85% relative humidity. Leaflets were randomly collected from each treatment group at 0, 48, 72, and 96 hours after pathogen inoculation and analyzed for total protein and enzyme production (POX, PAL, and CHI). After 28 days, the percentage of leaf lesions on the seedlings was evaluated. C. siamense inoculation reduced lesions. There were differences in total proteins and PRPs at different timepoints after inoculation, except for CHI activity, among treatments. To the best of our knowledge, this is the first record of resistance induction in guarana plants.

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Blueberries infected with the fungal pathogen Colletotrichum fioriniae release odors that repel Drosophila suzukii

Rering,

Quadrel,

Urbaneja‐Bernat

et al. 2023

Pest Management Science

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BACKGROUNDSpotted‐wing drosophila, Drosophila suzukii, is a serious pest of thin‐skinned fruits. Alternative methods to control this pest are needed to reduce insecticide use, including new repellents. Previous research demonstrated that D. suzukii adults use odor cues to avoid blueberries infected with the fungal pathogen Colletotrichum fioriniae, which causes the disease anthracnose. To identify novel D. suzukii repellents, we investigated the volatile emission from experimentally‐infected fruit, which were inoculated with C. fioriniae isolates in the laboratory, and from field‐collected fruit, which were naturally infected and harvested from a field. We then tested the pathogen‐induced volatiles on D. suzukii adult behavior.RESULTSVolatile emission was similar between all five C. fioriniae strains, with good agreement between experimentally‐infected and field‐collected berries. In total, 14 volatiles were found to be more abundant in infected versus uninfected fruit headspace. In multiple‐choice bioassays, nine of the 14 volatiles elicited repellency responses from adult D. suzukii. These nine volatiles were further evaluated in dual choice assays, where all nine reduced fly capture by 43–96% compared to the control. The most repellent compounds tested were the esters ethyl butanoate and ethyl (E)‐but‐2‐enoate, which were more or equally repellent to the known D. suzukii repellents 1‐octen‐3‐ol, geosmin, and 2‐pentylfuran. Dose‐response assays identified concentration‐dependent effects on D. suzukii repellency and oviposition when applied individually and consistent aversion observed across doses of a 1:1 blend.CONCLUSIONWe report two repellents from C. fioriniae‐infected blueberries that could be useful semiochemicals for the behavioral manipulation of D. suzukii in the field.This article is protected by copyright. All rights reserved.

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Managing Colletotrichum on Fruit Crops: A “Complex” Challenge

Cited by 130 publications

References 143 publications

Diversity of Colletotrichum Species Associated with Olive Anthracnose Worldwide

Diversity of Colletotrichum Species Associated with Olive Anthracnose Worldwide

Endophytic Colletotrichum siamense for Biocontrol and Resistance Induction in Guarana Seedlings

Blueberries infected with the fungal pathogen Colletotrichum fioriniae release odors that repel Drosophila suzukii

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