In April 1999 CLB was identified for the first time in Oregon. CLB has also been found in the state of Washington. Damage Oats are the favored host followed by barley, wheat, and various grasses including Timothy. Both larvae and adults feed on leaf tissue between the veins, especially on the flag leaf. Feeding skeletonizes leaves.
Damaged leaves appear to be striped - white stripes between green veins.
Heavily infested fields have a silvery appearance. Use of resistant varieties and biological controls have been quite successful in other parts of the country at keeping damage below levels that require treatment. ODA and USDA have already made parasite releases in Oregon. Note that alfalfa hay is not covered, but if grass is found in the hay by inspectors at the border, the load will be denied entry unless it is certified to be from an uninfested county. These commodities are prohibited if they come from infested counties unless they are treated and certified before shipment to California.