Aussie Finch Forum

Maybe worth a try - they don't detail which species of flys it attracts though

http://www.futurity.org/science-technol ... an-yellow/

"the discovery that flies are three times more attracted to the color blue than to yellow and that yellow actually seemed to repel flies".

Very interesting. They do say in the video that it was the house fly, which is the species we use in fly boxes... I bet their attraction to blue is still less than the attraction to that spot in the corner of your eye though!!