Parasitoid Abundance, Incidence of Larval Parasitism, and Effect of Trap Color on Attraction to the Onion Leafminer, Liriomyza trifolii(Burgess)

CRSP:   |  Region:   |  Topic:   |  Database:

Project Code:
Not Available

Start Date:

End Date:

CRSP Phase:
Phase 2

Not Available



Lead University:

Other Partners:
Philippine Rice Research Institute (Philippines)

Principal Investigator(s):

Co-Principal Investigator(s):
G.S. Arida, B.S. Punzal, A.A. Duca, and E.R. Tiongco (Philippine RiceResearch Institute), and E.G. Rajotte (Pennsylvania State Univeristy)


Onion farmers in the Philippines apply a large amount of insecticides against leafminers hoping to effectively manage this pest below damaging levels. Researchers believed that the naturally occurring parasitoids and trapping of adult flies are important components in the management of

leafminer in onion and other vegetables. This project specifically focused on determining the level of larval parasitism of leafminer and the effect of trap color as attractant to leafminer adult flies. Three towns each in Nueva Ecija and Nueva Vizcaya were sampled in this study.


1. To determine the level of larval parasitism of leafminer from different areas in Nueva Ecija and Nueva Viscaya and identify its parasitoids 2. To determine the effect of trap color as attractant to leafminer adult flies


The amount of insecticides used and the frequency of insecticide application could be substantially reduced when mass trapping of adults with yellow board traps and conservation of naturally occurring larval parasitoids are incorporated in the management of L. trifolii in onions and other vegetables.

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