Monitoring adult Spodoptera populations with sex pheromone traps for effective timing of interventions against insect defoliators affecting onion, Allium cepa Linn.

Issue Date

10-2003

Abstract

Field studies were conducted in Bongabon, Nueva Ecija [Philippines] during the 2001 and 2002 dry seasons to evaluate the effectiveness of sex pheromone-baited traps as indicator for timing of insecticide application against onion defoliators, Spodoptera litura (F.) and S. exigua (Hubner) (Lepidoptera:Noctuidae). In both years, peaks in adult trap catches were recorded between 25 and 59 days after transplanting. One to three insecticide applications at 3, 5, and 7 days after peaks in sex pheromone trap catches resulted in crop yield and leaf damage similar to those of weekly-sprayed plots. Plants in all treatments yielded significantly higher than plants in the untreated plots. Use of sex pheromone-baited traps can reduce the number of insecticide applications substantially, from weekly spraying, to only 1-3 application in a cropping season without reducing yields. The use of sex pheromone-baited traps can be a key tool in developing cost-reducing technologies to manage pests in rice-onion vegetable cropping system.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

17

Issue

2

Page

192

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

SPODOPTERA LITURA; SPODOPTERA LITURA; ALLIUM CEPA; PLANT PESTS; INSECTICIDES; TRAPS

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