Population dynamics of the leafminer, Liriomyza trifolii (Burgess)(Diptera:Agromyziidae), in onion (Allium cepa L.) fields planted after rice

Issue Date

10-2003

Abstract

A 2-year study was conducted on the population dynamics of Liriomyza trifolii (Burgess) in weekly-sprayed and unsprayed onion fields in Bongabon, Nueva Ecija, Philippines. Nueva Ecija province is known for large area cultivation of onion during the drier months of December to May. Changes in population density of L. trifolii larvae and adult flies, adult mines, damaged leaves, and natural enemies were recorded over a crop period. There were little differences noted in the above parameters studied between sprayed and unsprayed plots except for a significant reduction in larval parasitism and number of predators recorded on the weekly-sprayed plots. Peak population densities of larvae and damaged leaves were recorded when the crop neared maturity, so it was doubtful if losses would still be incurred at this time when bulbs were almost ready for harvest. Results of this 2-year study showed that spraying by farmers with the most commonly used insecticides (chlorpyrifos + BMPC) was not effective against L. trifolii but detrimental to its naturally occurring parasitoids and predators.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

191-192

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

ALLIUM CEPA; LIRIOMYZA TRIFOLII; PLANT PESTS; CHLORPRRIFOS; NATURAL ENEMIES; PREDATORS

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