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Using Single Sensillum Recording to Detect Olfactory Neuron Responses of Bed Bugs to Semiochemicals

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A chemical switch for detecting insect infestation.

Kanchana A Weerakoon¹, Bryan A Chin

¹Materials Engineering Department, Auburn University, Auburn, AL 36849, USA. weeraka@auburn.edu

Pest Management Science

|January 21, 2012

Summary

A novel plant volatile sensor acts as a chemical switch, detecting phytochemicals to prevent insect infestation. This inexpensive, stable sensor uses a polymer-carbon composite near its percolation threshold.

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Electroantennographic Bioassay as a Screening Tool for Host Plant Volatiles

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Published on: May 6, 2012

Area of Science:

Materials Science
Plant Science
Sensor Technology

Background:

Plants release phytochemicals for defense against herbivores.
Early detection of these plant volatiles can prevent insect infestation.

Purpose of the Study:

To design and fabricate a novel chemical sensor.
To detect plant-emitted phytochemicals for pest control applications.

Main Methods:

Utilized polyethylene-co-vinyl acetate as the base polymer.
Developed a polymer-carbon composite sensor near its percolation threshold.
Observed sensor resistance changes in response to plant volatile analytes.

Main Results:

The sensor exhibited a 'switch-off' response (increased resistance) upon exposure to plant volatiles.
A 'switch-on' response (returned to original state) was observed when the analyte vapor was removed.
The percolation point was achieved at 2.5 wt% carbon concentration.

Conclusions:

A low-mass-fraction carbon composite sensor was successfully fabricated.
The sensor detects specific plant volatiles including limonene and pinene.
The sensor is cost-effective, easy to produce, and air-stable.