Management of Spodoptera litura (F.) and S. exigua (Hubner) on onion by mass trapping of the moths and timing of interventions in farmers' fields

Issue Date

10-2004

Abstract

The frequency of insecticide spraying, level of damage and yield of onion in farmers' fields were compared with the same parameters in researcher-managed plots. Farmer cooperators were allowed to follow their pest control practices while in the researcher-managed plot, application of insecticides was based on the number of male S. litura and S. exigua moths caught in sex pheromone-baited traps. Frequency of spraying in farmer cooperator's fields ranged from 2 to 6 times with a mean of 4.4 while it was 2 to 3 times and mean of 2.6 in the researcher's plot. Percent damaged leaves taken four times during the crop season ranged from 3.7 to 4.7% and 3.6 to 6.3% in researcher's and farmer's plot, respectively. There was no significant difference in the mean yield between farmer's plot and the researcher's plot. Although the farmers applied more insecticides than the researcher, the levels of insect damage and yield were not different. This study further demonstrated that sex pheromone-baited trap is an important tool for effective timing of control interventions against S. litura and S. exigua on onion.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

18

Issue

2

Page

173-174

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

SPODOPTERA LITURA; SPODOPTERA EXIGUA; ALLIUM CEPA; PLANT PESTS; INSECTICIDES; SEX PHEROMONES; FARMERS; CROP YIELD

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