ARTHROPODS OCCURRING ON SWEET WHITE LUPIN AND NATIVE LUPINS IN SOUTHEASTERN WASHINGTON

The major pests of white lupin, Lupinus albus L., in eastern Washingto n were Lygus spp., Delia spp., Spodoptera praefica (Grote), and Mamest ra configurata Walker. On native lupins (L. leucophyllus Douglas, L. p olyphyllus Lindl. and L. sulfureus Douglas), the most destructive inse cts were Tychius lineelus LeConte and Glaucopsyche lygdamus (Doubleday ). Pima albocostalialis (Hulst) was a primary pest of both native and white lupin as it bored into pods and fed on seeds. Native lupins deve lop, on average, earlier in the year than white lupin. Pests associate d with these native lupins are often univoltine and closely synchroniz ed with their host plant. Consequently, these pests are separated temp orarily from the development of white lupin. In contrast, pests associ ated with white lupin are typically multivoltine and are more generali zed with regard to their food source requirement. Because of these fac tors, pests of native lupin species, with the exception of P. albocost alialis, do not contribute greatly to the pest complex of white lupins .