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Probable match (100%) "VELAZHAHAN": 2 articles found.
AL-KHARUSI A.I., AL-SADI A.M., AL-SHUAIBI B., AL-MAHMOOLI I.H., AL-KINDI M.A., VELAZHAHAN R. (2025): Mass production of Trichoderma asperellum SQU7 using Phragmites australis as a substrate carrier for managing damping-off disease in cucumber. [biofungicide, biological control, common reed, Cucumis sativus, disease management, soilborne pathogen.] Czech Mycology 77(2): 109-120 (published: 25th July, 2025)
abstract
Trichoderma species are commonly used as biocontrol agents to manage various soilborne fungal and oomycete pathogens affecting crop plants. Various organic and inorganic carriers for mass production of Trichoderma intended for field application have been documented in the literature. In this study, Trichoderma asperellum strain SQU7, isolated from Omani soil, was screened for antagonistic activity against Pythium aphanidermatum, the causal agent of damping-off disease in cucumber. In addition, the possibility of using common reed (Phragmites australis) for mass production of T. asperellum was explored and its efficacy in controlling P. aphanidermatum-induced damping-off in cucumber was evaluated under controlled glasshouse conditions. The findings showed that T. asperellum provided a strong inhibitory effect on the growth of P. aphanidermatum in the confrontation assay and caused morphological abnormalities in the pathogen’s hyphae as determined by means of scanning electron microscopy analysis. Trichoderma asperellum proliferated well on common reed, and significantly suppressed P. aphanidermatum damping-off incidence in cucumber seedlings grown in pots. This study presents an efficient and affordable approach for the large scale production of T. asperellum, which can be utilised to effectively control damping-off of cucumber in an environmentally sustainable way.
AL-TOUBI A.S.S., AL-SADI A.M., AL-MAHMOOLI I.H., AL-HARRASI M.M.A., AL-SABAHI J.N., VELAZHAHAN R. (2022): Volatile organic compounds emitted by mycoparasitic fungi Hypomyces perniciosus and Cladobotryum mycophilum suppress the growth of Agaricus bisporus. [antifungal, cobweb, ethanol, wet bubble, white button mushroom.] Czech Mycology 74(2): 141-152 (published: 14th November, 2022)
abstract
Hypomyces perniciosus and Cladobotryum mycophilum are mycoparasitic fungi infecting Agaricus bisporus and causing wet bubble and cobweb diseases, respectively. In this work, the role of volatile organic compounds (VOCs) emitted by these fungal mycoparasites in the suppression of A. bisporus was investigated. The VOCs of H. perniciosus and C. mycophilum effectively reduced the mycelial growth of A. bisporus by 60% and 73% after 5 days of incubation, respectively, compared to that of the control as assessed by the two-sealed-base-plates assay. Further, the VOCs of H. perniciosus and C. mycophilum were collected in a headspace solid-phase microextraction procedure, and their components analysed by means of gas chromatography-mass spectrometry. Ethanol was identified as the major volatile component in H. perniciosus and C. mycophilum. Ethanol vapour significantly retarded the growth of A. bisporus in an in vitro assay. The results of this study suggest that ethanol produced by H. perniciosus and C. mycophilum could be involved in the suppression of A. bisporus.
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