Date of Publication
4-11-2025
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Biology major in Medical Biology
Subject Categories
Plant Biology
College
College of Science
Department/Unit
Biology
Thesis Advisor
Mark Angelo O. Balendres
Defense Panel Chair
Dennis A. Dolojan
Defense Panel Member
Mark Christian Felip R. Redillas
Shyatesa Razo-Regino
Abstract (English)
Cycas species, representing the old Cycadaceae family, have important ecological and botanical functions. However, they are increasingly threatened by plant diseases. Despite their importance and medicinal value, microbial populations in cycas leaves are responsible for disease development and affect plant health and conservation practices. This research seeks to determine and describe the causative pathogens of cycas leaf disease through a narrative review of known Cycas diseases, and to identify the causative fungal pathogens of cycas leaf diseases from sample collected from Cavite and Nueva Ecija. This study revealed that C. revoluta is the most susceptible species to fungal diseases globally, particularly to Phytophthora and Fusarium species. Moreover, common pathogens are fungi like Alternaria, Phoma, and Colletotrichum, which produce necrotic lesions and root or leaf rot. Subsequently, disease incidence is most prevalent in tropical and subtropical areas, with humid environments that speed up disease development. And lastly, management practices differ around the world but focus on integrated methods employing chemical, cultural, and biological control techniques. In the laboratory, several fungal isolates were collected and pathogenicity tests were performed to determine causal associations between fungal isolates and leaf symptoms. One of the isolates was identified as Aspergillus flavus, a previously undocumented causative agent of cycas leaf spot disease, based on cultural and morphological characteristics. This study adds to a greater understanding of plant-pathogen interactions by elucidating microbial diversity linked with cycas leaf diseases. It informs future conservation strategies for these botanically and ecologically important species.
Abstract Format
html
Abstract (Filipino)
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Abstract Format
html
Language
English
Format
Electronic
Keywords
Cycas; Aspergillus flavus; Plant diseases
Recommended Citation
Punongbayan, A. D., Lingat, J. D., Lagahit, Y. T., & Morales, J. A. (2025). Knowledge review of Cycas species diseases and identification of Aspergillus flavus causing leave spot. Retrieved from https://animorepository.dlsu.edu.ph/etdb_bio/127
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Embargo Period
4-14-2025
