In vitro effect of Cuban strains of Trichoderma spp. on the growth of the pathogen Phyllosticta citricarpa (McAlpine) Aa

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Ana M. Manzano León
Wendy Serra
Amalia Sanz Llorente
Amaia Ponce de la Cal
Yamilé Baró Robaina
Frank A. Díaz Leyva

Abstract

The objective of this research was to evaluate the in vitro effect of Trichoderma spp. on Phyllosticta citricarpa (McAlpine) Aa growth. A total of twenty P. citricarpa isolates from major citrus-producing regions in Cuba were included in the analysis. Trichoderma harzianum Rifai (strains LBAT-34 and LBAT-53) and Trichoderma viride Pers. (strain LBAT-TS3) were tested for their ability to inhibit mycelial growth of P. citricarpa. Inhibition was evaluated using the in vitro dual culture assay. Percentages of inhibition of radial growth (PIRG) were determined after 3, 5, and 7 days, and type and intensity of the antagonism of Trichoderma were also classified. Kruskal-Wallis and non-parametric multiple comparison tests were implemented for the statistical analysis. Results showed that the percentages of inhibition of radial growth ranged from 38.7% to 29.2% after 3 days of co-culture. After the fifth day, the antagonist strains overran the P. citricarpa colonies and inhibited their growth completely. Furthermore, it was found that the mycelial growth inhibition of P. citricarpa isolates by Trichoderma spp. was through mechanisms of antibiosis and hyperparasitism. This study is the first evaluation of the susceptibility of P. citricarpa to biological control agents in Cuba.

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1.
Manzano León AM, Serra W, Sanz Llorente A, Ponce de la Cal A, Baró Robaina Y, Díaz Leyva FA. In vitro effect of Cuban strains of Trichoderma spp. on the growth of the pathogen Phyllosticta citricarpa (McAlpine) Aa. Rev. Protección Veg. [Internet]. 2025 Jun. 3 [cited 2025 Jul. 12];40:https://cu-id.com/2247/v40e01. Available from: https://revistas.censa.edu.cu/index.php/RPV/article/view/1374
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SHORT COMMUNICATIONS

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