Extraction and identification of potential aggregation and sex pheromones of the cacao bean weevil [Araecerus fasciculatus (De geer)] in Cotabato, Philippines

Date of Publication

11-2024

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Biology major in Medical Biology

Subject Categories

Biology

College

College of Science

Department/Unit

Biology

Thesis Advisor

Kris Lord T. Santos

Defense Panel Chair

Divina M. Amalin

Defense Panel Member

Divina M. Amalin
Shad Natthew S. Arce
Ma. Christine G. Ortiguerro

Abstract (English)

The cacao bean weevil (CBW) is an important insect pest of cacao in the Philippines during post-harvest storage. Damage to beans due to feeding results in reduced quality and increases the rate of infection of mycotoxin-producing fungi. In the Philippines, there are currently no measures formulated and implemented to control this insect pest. A promising method to monitor and control CBW infestation is the use of pheromones to attract and trap insects in warehouses. Here we extracted and identified potential pheromones of CBW. By comparing the GC-MS profile of male and female CBW extracts, unique compounds were identified. These compounds include long-chain carboxylic acids, an aldehyde and a ketone that were extracted only from female CBW and are thus potential sex pheromones. On the other hand, a unique carboxylic acid was found in males that may potentially be another aggregation pheromone component of CBW. Squalene, which was previously reported as a male-produced aggregation pheromone of CBW in China, was extracted and detected from both male and female CBW. These results provide important baseline information on the chemicals CBW use for communication and can be used for the formulation of trapping systems exploiting this natural behavior.

Abstract Format

html

Abstract (Filipino)

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Abstract Format

html

Language

English

Format

Electronic

Keywords

Coffee bean weevil--Philippines--Cotabato City; Pests—Control

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Embargo Period

12-9-2024

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