Silver Fly on Hemlock Branch Infested with Hemlock Woolly Adelgid (image) University of Vermont Share Print E-Mail Caption Like tufts of cotton on each branch, the egg sacks of an invasive pest, hemlock woolly adelgid, mean death for this eastern hemlock in Tennessee -- unless a West Coast fly can come to the rescue. A team of scientists from the University of Vermont, Oregon State University, and the US Forest Service have released adelgid-eating flies from the Pacific Northwest in two spots on the East Coast. If their experiment succeeds, this fly could save the hemlock from the fate of the now-vanquished chestnut and elm. Credit Bud Mayfield, USFS Usage Restrictions with coverage of associated story Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.