Alvarez, J.M. 2004 Trionymus haancheni McKenzie: A New Pest of Barley in Idaho.. PMN: Plant Health Progress March 15, 2004.

Notes: [Published online: http://www.plantmanagementnetwork.org/pub/php/management/2004/barley/] A new insect pest of barley, Trionymus haancheni McKenzie, sometimes referred to as the Haanchen barley mealybug, was discovered for the first time in Idaho near Soda Springs during June 2003 in a commercial barley field. Brief description, illustrations, distribution in Idaho, damage, life cycle and chemical and biological control.