Effects of UV-B radiation on Lecanicillium spp., biological control agents of the coffee leaf rust pathogen

Galvao, J. A. H.; Bettiol, W.

doi:10.1590/s1982-56762014000500006

Cited by 18 publications

(13 citation statements)

References 37 publications

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“…C. rosea was applied at 10 7 conidia mL −1 (white circles) and at 10 6 conidia mL −1 (black circles). the other hand, Galvão and Bettiol (2014) observed the most tolerant strain of L. lecanii, found naturally hyperparasitising urediniospores of Hemileia vastatrix in coffee leaf rust lesions, had an LD 50 of 1.63 kJ m −2 for UV-B radiation exposure, and is therefore more sensitive than C. rosea. Our work corroborates the hypothesis raised by Ignoffo and Garcia (1992) that the colour of conidia is correlated with tolerance to solar radiation.…”

Section: Discussionmentioning

confidence: 95%

“…Ultraviolet radiation inhibits the conidial germination of other beneficial organisms, such as Metarhizium, Lecanicillium and C. rosea on the phylloplane (Braga et al, 2001a;Costa et al, 2001Costa et al, , 2012Costa et al, , 2013Galvão & Bettiol, 2014). Competition is the most important mechanism of C. rosea to control B. cinerea in strawberry plants, and the applied concentration of the biocontrol agent conidia seems to have a crucial role.…”

Section: Discussionmentioning

confidence: 99%

“…Sorok, Beauveria bassiana (Bals.-Criv.) Vuill, C. rosea, and Lecanicillium lecanii Zare & Gams (Braga et al, 2001a;Costa, Robb, & Wilen, 2001;Costa, Rangel, Morandi, & Bettiol, 2012, 2013Galvão & Bettiol, 2014). In general, short periods of exposure to UV-B radiation can inactivate propagules of fungi due to genetic and morphological changes, resulting in decreased viability of propagules (Braga et al, 2001a).…”

Section: Introductionmentioning

confidence: 99%

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UV-B radiation reduces biocontrol ability of Clonostachys rosea against Botrytis cinerea

Costa

Morandi

Stricker

et al. 2016

Biocontrol Science and Technology

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There is a lack of information comparing UV-B radiation conidial sensitivity of the biocontrol agent Clonostachys rosea (Cr) and its target pathogen, Botrytis cinerea (Bc). We investigated the interactions in vitro and on strawberry leaf discs between previously selected Cr and Bc strains tolerant to UV-B radiation. Strawberry leaf discs inoculated with Bc, Cr, or combinations of both fungi were exposed to UV-B doses (2.9, 5.9, and 8.9 kJ m −2). Incidence and sporulation of both fungi were evaluated, and the Area Under Incidence Progress Curve (AUIPC) and Area Under Sporulation Progress Curve (AUSPC) were calculated. AUIPC and AUSPC of Cr on leaf discs were negatively correlated to increased UV-B. When inoculated alone on leaf discs, Bc was not affected by UV-B, but when inoculated with Cr the incidence and sporulation of Bc were positively correlated to UV-B radiation dose. In the absence of UV-B, Cr reduced incidence and sporulation of Bc. However, the ability of Cr to control Bc was reduced by 20% to 50% with increasing UV-B radiation. Increasing the applied concentration of Cr conidia 10-fold partially overcame the deleterious effects of UV-B on the ability of the biocontrol agent to reduce Bc sporulation in strawberry leaves. The selection of antagonists must fulfil many requirements; besides being active against the specific targeted plant pathogens, they must be costeffective and have ecological characteristics suitable for the desired use conditions. We suggest that UV-B exposure must be taken into account during the development of bio-fungicides based on Cr.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UV-B radiation reduces biocontrol ability of Clonostachys rosea against Botrytis cinerea

Costa

Morandi

Stricker

et al. 2016

Biocontrol Science and Technology

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“…In such cases, the fungal colonies are directly exposed to different UV-B radiation doses and the experiments are focused on the effect of UV-B radiation on growth, sporulation and propagules germination. The main micro-organisms used is these studies are the biological control agents, once the UV-B radiation is a factor that interfere in the efficacy of biological products Galvão and Bettiol, 2014;Rangel et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Effect of the increase of UV-B radiation on strawberry fruit quality

Nechet¹,

Heck²,

Terao³

et al. 2015

Scientia Horticulturae

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“…These results indicated that Lecanicillium isolates can be highly sensitive to various biological substances and non-synthetic factors. Galvão and Bettiol (2014) showed the high susceptibility of Lecanicillium genera to UV-B radiation, while Mehrparvar et al (2016) determined the antifungal activity of two essential oils at low concentrations for the growth of L. fungicola.…”

Section: M9mentioning

confidence: 99%

Efficiency of Gaseous Ozone in Disinfection of Mushroom Growing Rooms

Szumigaj-Tarnowska

Szafranek

Ulinski

et al. 2020

Journal of Horticultural Research

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Fungal diseases are a persistent problem in the cultivation of white button mushrooms (Agaricus bisporus). The chemical control of pathogens is becoming less effective and less desirable, so new ways to limit these infections are urgently required. What is more, the disease is mostly controlled through cultural practices and good hygiene on mushroom farms. The aim of this study was to evaluate the fungicidal effects of ozone on fungal pathogens of common mushrooms. Experiments with the use of ozone gas for disinfection of growing rooms after the completion of the mushroom growing cycle were carried out. The fungicidal effectiveness of ozone fumigation was evaluated on the basis of the survival rate of the spores of the pathogens tested (Lecanicillium fungicola, Cladobotryum dendroides, Mycogone perniciosa, and Trichoderma aggressivum). Spore suspension was applied to aluminum plates and then was exposed to gaseous ozone. The assessment of the growth of colonies of fungal isolates obtained from infected surfaces was carried out using Rodac contact test plates. The results showed that L. fungicola, M. perniciosa, and C. dendroides isolates were sensitive to the gas ozone. In order to achieve 100% efficacy against Mycogone strains, a minimum of 6 hours of ozonation had to be applied, whereas for Cladobotryum strains, a minimum of 8 hours had to be applied. The Lecanicillium species was the most sensitive to ozonation because 30 minutes of ozonation was enough to gain 100% inhibition of its growth. No satisfactory results were obtained in the case of the pathogenic species of Trichoderma, regardless of the experimental conditions. Nevertheless, this study has demonstrated the usefulness of ozone as a disinfectant for empty growing rooms after the completion of the mushrooms’ cultivation cycle.

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Effects of UV-B radiation on Lecanicillium spp., biological control agents of the coffee leaf rust pathogen

Cited by 18 publications

References 37 publications

UV-B radiation reduces biocontrol ability of Clonostachys rosea against Botrytis cinerea

UV-B radiation reduces biocontrol ability of Clonostachys rosea against Botrytis cinerea

Effect of the increase of UV-B radiation on strawberry fruit quality

Efficiency of Gaseous Ozone in Disinfection of Mushroom Growing Rooms

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