Repellency of volatile organic chemicals of kakawate, Gliricidia sepium (Jacq.) Walp., to rice green leafhopper, Nephotettix virescens (Distant) (Hemiptera: Cicadellidae)

Issue Date

6-2014

Abstract

The behavioral and olfactory responses of male and female rice green leafhopper (GLH), Nephotettix virescens (Distant), an important vector of tungro, was studied to elucidate the mechanism for reduced green leafhopper populations in rice with kakawate (Gliricidia sepium (Jacq.) Walp.) trees growing near rice fields as observed by farmers. The methods include leaf disc assay to determine possible effect of organic chemical volatiles and the Y-tube olfactometric bioassays to be able to pinpoint the specific organic component(s) among the headspace volatiles responsible for the repellent property of kakawate. Our results demonstrated that only females of GLH were apparently repelled by the odors released from the leaf discs of kakawate. ß-Farnesene and trans-2-hexenol repelled GLH in Y-tube olfactometric bioassays and strongly suggest that repellency is a mechanism for reduced GLH populations in the rice field. Kakawate planted along rice fields can be promoted for insect pest management in rice production to promote sustainability and reduce dependence on synthetic insecticides. It can be a useful pest management strategy in organic and low-input rice production.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

0031-7454

Volume

97

Issue

2

Page

148-154

Document Type

Article

Physical Description

illustrations, graphs

Language

English

Subject

Gliricidia sepium, Leaf disc, Nephotettix virescens, Organic agriculture, Petri plate bioassay, Rice green leafhopper, Visual cue, Volatile organic chemicals, Y-tube olfactometer

Digital Copy

yes

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