Chemical basis for the population reduction of the Asian corn borer on corn entwined with Ipomoea triloba L.

Issue Date

11-2000

Abstract

The oviposition behavior of Ostrinia furnacalis on corn in the presence of Ipomoea triloba was assessed in laboratory and field experiments while the origin of olfactory stimuli for habitat location of O. furnacalis was investigated in a Y-tube olfactometer. Two host plant resistance mechanisms were found to reduce corn borer oviposition: (1) the production of volatile attractants from corn is suppressed due to entwining of I. triloba on corn and, (2) the production of a volatile repellent is increased when I. triloba is entwined on corn. Experienced female corn borer moths discriminated between headspace volatiles collected from either potted corn, I. triloba, corn entwined by I. triloba or wired corn and their respective controls (solvent). Phenological factors and stress, like that produced by wiring, reduced the attractiveness of corn to corn borer moths. Chemical analysis of the headspace volatiles supports the behavioral data. The chemical profile of plant volatiles emitted by corn entwined by I. triloba showed a marked difference from those emitted by I. triloba grown separately. Entwining of I. triloba or wiring on corn produced similar changes in the ratios of headspace volatiles. Laboratory olfactory tests showed the repellency of 1-methylethyl propyl disulfide and the attractiveness of a blend of some hydrocarbons which are characteristics of corn and I. triloba headspace. Response to these chemicals was dosage-dependent. Oviposition was reduced, not inhibited, when moths were exposed to 1-mrthylethy propyl disulfide. Changes in the volatile allelochemistry of corn, I. triloba and changes in the chemical ecology of the corn - I. triloba complex consequently affect Asian corn borer moth behavior.

Source or Periodical Title

Journal of the International Society for Southeast Asian Agricultural Sciences (Journal of ISSAAS)

ISSN

0859-3132

Volume

6

Issue

2

Page

28-42

Document Type

Article

Frequency

semi-annually

Physical Description

tables

Language

English

En – AGROVOC descriptors

OSTRINIA FURNACALIS; IPOMOEA; REPELLENTS; OVIPOSITION; ATTRACTANTS; CHEMICAL ECOLOGY; SEMIOCHEMICALS; POPULATION DECREASE

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