Investigation on the 2016 outbreak of the onion armyworm, spodoptera exigua (Hubner) (Lepidoptera: Noctuidae), in onion growing areas in Nueva Ecija

Issue Date

10-2017

Abstract

The extent of infestation of armyworm on onion and possible cause of its outbreak in 2016 in Nueva Ecija were determined through site visits, interview and dialogue with farmers, and review of pertinent literature. Notes on its biology are also provided. The species involved in the outbreak was identified as Spodoptera exigua (Hubner). Fourteen municipalities covering 5,330 hectares and involving 4,089 farmers were affected. An estimated total loss of PHP 1,609,997,316.00 was incurred from February to April 2016. S. exigua, a host: Capsicum annuum L., Cucurbita maxima Duchesne, Momordica charantia L., Vigna unguiculata (L.) Walp., Zea mays L., Achyranthes aspera L., Amaranthus viridis L., Centrocema pubescens Benth., Commelina benghalensis L., Eleusine indica (L.) Gaertn, Synedrella nodiflora (L.) Gaertn., Rottboellia conchinchinensis (Lour.) Clayton, and Tagetes sp., Developmental period of onion armyworm reared on fruits of stringbeans ranged from 16-25 days. Outbreak is suspected to have resulted from mass long distance migration from countries northeast of the Philippines, which could have been triggered by El Niño.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

31

Issue

2

Page

151-152

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

ONIONS; SPODIPTERA EXIGUA; INSECTA; PESTS; PEST OF PLANTS; MIGRATORY PEST; PEST MONITORING; ANIMAL MIGRATION; INFESTATIONS

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