Bioefficacy of three allium species against lasiodiplodia theobromae and colletotrichum asianum and their impact on symptom development in mango (Mangifera indica L.)

Date of Publication

7-2025

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Biology

Subject Categories

Plant Sciences

College

College of Science

Department/Unit

Biology

Thesis Advisor

Mark Angelo O. Balendres

Defense Panel Chair

Mark Christian Felipe R. Redillas

Defense Panel Member

Dennis A. Dolojan
John Paul S. Domingo

Abstract (English)

Mango (Mangifera indica L.) is an economically and nutritionally valuable fruit. Mango production and quality are severely affected by various diseases, including stem-end rot (SER) caused by Lasiodiplodia theobromae and anthracnose caused by Colletotrichum asianum. Recent studies show that certain plant extracts, such as those from Allium species, have antimicrobial properties and can suppress various plant pathogens. This research attempted to manage SER and anthracnose in mango using antimicrobial extracts derived from Allium species. In vitro and in vivo tests demonstrated Allium species' antifungal properties. Five trials were conducted for the in vitro assay, each with varying concentrations of Allium extracts. For the in vivo assay, protective and curative techniques were performed, and Allium extracts were sprayed directly on the mangoes. Radial growths of fungi were measured and analyzed using one-way ANOVA. In vitro tests showed that onion (A. cepa) and garlic (A. sativum) extracts had significant antifungal activities, but shallot (A. ascalonicum) did not. In vivo tests exhibited no significance for curative and protective assays against L. theobromae. However, onion and garlic extracts demonstrated significant inhibition against C. asianum. Curative and protective techniques did not differ from each other. While onion and garlic extracts were shown to be highly antifungal, their use in the field may be limited as protective applications on mango fruits diminish after 3 days. Nevertheless, the extracts used in this study did not cause phytotoxicity on mango fruits. Further research on prolonging the protective mechanisms of these extracts and identifying key bioactive metabolites is needed. The findings of this study may contribute to the development of alternative approaches for managing SER and anthracnose once results are validated in the field. They may serve as a foundation for future research on plant-based antifungal treatments.

Abstract Format

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Abstract (Filipino)

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Abstract Format

html

Language

English

Format

Electronic

Keywords

Anthracnose; Mango—Diseases and pests; Plant extracts; Plant diseases; Colletotrichum

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Embargo Period

8-14-2025

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