Effect of chlorpyrifos + BPMC insecticide spray on the population density, damage and natural enemies of leafminer [Liriomyza trifolii (Burgess)] on onion (Allium cepa Linn.) grown after rice (Oryza sativa Linn.)

Issue Date

4-2009

Abstract

A 2-year study was conducted on the population density of adults, larvae, extent of damage, and larval parasitoids of the onion leafminer (LM) Liriomyza trifolii (Burgess) in weekly-sprayed and unsprayed onion fields in Bongabon, Nueva Ecija, Philippines. The area is known for large-scale cultivation of onion during the dry months from December to May. Changes in population density of LM larvae, number of oviposition punctures, mines, damaged leaves, natural enemies and adult flies caught in yellow board. There were little differences observed in the parameters studied between sprayed and unsprayed plots except for a significant reduction in larval parasitism and number of generalist predators recorded on the weekly-sprayed plot. Spraying onion field with the farmers' most commonly used insecticide (Chlorpyrifos+BMPC) was not effective against LM but detrimental to its naturally-occuring parasitoids and predators.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

23

Issue

1

Page

56-66

Document Type

Article

Frequency

semi-annually

Physical Description

graphs ; tables

Language

English

En – AGROVOC descriptors

LIRIOMYZA TRIFOLII; AGROMYZIDAE; ORYZA SATIVA; CHLORPYRIFOS; INSECTICIDES; POPULATION DYNAMICS; NATURAL ENEMIES

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