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Biocontrol Effects of Paecilomyces variotii against Fungal Plant Diseases

Departamento de Agronomía, Escuela Superior de Ingeniería, Universidad de Almería, 04120 Almería, Spain
Author to whom correspondence should be addressed.
Academic Editors: Antonieta De Cal, Inmaculada Larena and Paloma Melgarejo
J. Fungi 2021, 7(6), 415;
Received: 30 April 2021 / Revised: 18 May 2021 / Accepted: 23 May 2021 / Published: 26 May 2021
(This article belongs to the Special Issue Control of Fungal Diseases in Crops)
The genus Paecilomyces is known for its potential application in the control of pests and diseases; however, its use in agriculture is limited to few species. Research interest in new formulations based on microorganisms for the control of pathogens is growing exponentially; therefore, it is necessary to study new isolates, which may help control diseases effectively, and to examine their compatibility with established agricultural control methods. We analysed in vitro and in vivo the antagonistic capacity of Paecilomyces variotii against seven phytopathogens with a high incidence in different crops, and we examined its compatibility with 24 commercial fungicides. P. variotii was applied in the following pathosystems: B. cinereal—melon, Sclerotinia sclerotiorum—pepper, R. solani—tomato, F. solani—zucchini, P. aphanidermatum—melon, M. melonis—melon, and P. xanthiizucchini. The results showed strong control effects on M. melonis and P. xanthii, reducing the disease severity index by 78% and 76%, respectively. The reduction in disease severity in the other pathosystems ranged from 29% to 44%. However, application of metabolites alone did not cause any significant effect on mycelial growth of phytopathogens, apart from F. solani, in which up to 12% inhibition was observed in vitro when the extract was applied at a concentration of 15% in the medium. P. variotii was compatible with most of the tested fungicides, and of the 24 fungicides tested at the maximum authorised dose, 6 acted as fungicides, 4 as fungistatics, and the remaining showed inhibition rates ranging from 18.2% to 95.8%. These results indicate that P. variotii is a potential biological control agent to be used against several aerial and soil diseases, thus it should be integrated into modern pest management strategies. View Full-Text
Keywords: Paecilomyces; biological control; endophyte; phytopathogens; aerial and soil diseases Paecilomyces; biological control; endophyte; phytopathogens; aerial and soil diseases
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MDPI and ACS Style

Moreno-Gavíra, A.; Diánez, F.; Sánchez-Montesinos, B.; Santos, M. Biocontrol Effects of Paecilomyces variotii against Fungal Plant Diseases. J. Fungi 2021, 7, 415.

AMA Style

Moreno-Gavíra A, Diánez F, Sánchez-Montesinos B, Santos M. Biocontrol Effects of Paecilomyces variotii against Fungal Plant Diseases. Journal of Fungi. 2021; 7(6):415.

Chicago/Turabian Style

Moreno-Gavíra, Alejandro, Fernando Diánez, Brenda Sánchez-Montesinos, and Mila Santos. 2021. "Biocontrol Effects of Paecilomyces variotii against Fungal Plant Diseases" Journal of Fungi 7, no. 6: 415.

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