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Trapping insects by color: Will it work in Montana?
Date:1/2/2014

BOZEMAN, Mont. Red and green traps attract more sweetpotato weevils than other colors, and a Montana State University researcher who made that discovery wants to know if Montana insects react the same way.

Gadi V.P. Reddy, superintendent and entomologist/ecologist at MSU's Western Triangle Agricultural Research Center at Conrad, said the lessons he learned in Guam and published in the Jan. 2 issue of the Annals of the Entomological Society of America will be tested on some of the major pests that destroy Montana's wheat, barley and canola.

Those insects include adult click beetles (wireworms), flea beetles and wheat stem sawfly. The wheat stem sawfly is the most destructive wheat pest in Montana. Wireworms -- tiny white larvae that turn into click beetles are second only to wheat stem sawfly for insects that damage wheat and barley in Montana. Flea beetles target canola.

Reddy and his collaborators from the University of Guam (Nirupa Gadi, Rosalie Kikuchi, Jenelyn Batista and others) discovered the relationship between colors and trap effectiveness while developing a trapping system for the sweetpotato weevil. They used a variety of traps that used pheromones to attract the insects. Pheromones are chemicals that insects secrete or excrete to trigger a response in other insects of the same species.

Previous studies showed that the sweetpotato weevil, when outdoors, preferred red traps over gray, green, brown, blue, white, yellow or black, with light red being more attractive than other shades of red, so Reddy and his collaborators conducted a new study. That one was conducted indoors, to see if the weevils reacted any differently. Since the sweetpotato weevil is a pest in both the field (outdoors) and storage (indoors), Reddy said the results are useful in managing the weevil pests.

The scientists discovered that red traps are best when the weevils are outdoors and green traps are most effective when sweetp
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Contact: Evelyn Boswell
evelynb@montana.edu
406-994-5135
Montana State University
Source:Eurekalert

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