Verification of effectiveness of the predatory earwig Euborellia annulata (Fabr.) in combination with botanical insecticide against insect pests of pole sitao

Issue Date

10-2011

Abstract

The effectiveness of field releases of earwig Euborellia annulata (Fab.) (Dermaptera: Anisolabididae) in combination with the need-based spraying of Oriental Herbal Nutrient (OHN) (T1) was verified against the major insect pests of string beans. This was compared with the weekly spraying of methomyl (T2) and the untreated control (T3). The dominant insect pest encountered was the pod borer, which is very destructive during the reproductive stage because it could significantly reduce the yield through feeding on flowers and fruits. Lowest pod borer population was monitored in T1 followed by T2 and highest in T3. Natural enemies encountered were coccinellid beetles, spider, long-horned grasshopper and parasitic dipteran. Although these natural enemies could not efficiency control pod borer population in the field, they could play a major role in regulating pest population. The field releases of predatory earwig E. annulata at 3 and 4 weeks after planting (20,000 individuals/ha/release) and need-based spraying of OHN (botanical insecticide with ginger as the main component) on stringbeans gave 20% higher yield and net profit than the weekly spraying of methomyl. Pest population should be regularly monitored at weekly interval since it might be necessary to increase the number of earwig releases and frequency of OHN spraying at high pest population increase. Aside from the higher net income obtained with the release of earwig and application of botanical insecticide, said practices are being recommended in the management of insect pests of stringbeans since they are safe to consumers and environment-friendly.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

25

Issue

2

Page

213

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

DERMAPTERA; KIDNEY BEANS; INSECTA; PREDATORY INSECTS; PREDATORS; PREDATION; PLANT PESTS; BOTANICAL INSECTICIDES

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