. Brigham Young University science bulletin. Biology -- Periodicals. MlBIDAE OF THE NEVADA TEST SlTE viscidiflorus; Area 17M, d Aug. 5, 1965, on Franseria acanthicarpi; cf Aug. 26, 1965, on Franseria acanthicarpi. In the western states this species is generally very abundant in alfalfa fields along with Lygus hesperus, but is not regarded as destructive of seed as the species hesperus. Shull (1933) has shown that elisus prefers bean plants where they are grown, reporting that the species was a de- structive pest of beans in Idaho. Lygus hesperus Knight Fig. 250 Lygus elisus var. hesperus Knigh
. Brigham Young University science bulletin. Biology -- Periodicals. MlBIDAE OF THE NEVADA TEST SlTE viscidiflorus; Area 17M, d Aug. 5, 1965, on Franseria acanthicarpi; cf Aug. 26, 1965, on Franseria acanthicarpi. In the western states this species is generally very abundant in alfalfa fields along with Lygus hesperus, but is not regarded as destructive of seed as the species hesperus. Shull (1933) has shown that elisus prefers bean plants where they are grown, reporting that the species was a de- structive pest of beans in Idaho. Lygus hesperus Knight Fig. 250 Lygus elisus var. hesperus Knight, 1917:575. Lygus hesperus Shull, 1933:1076. Lygus hesperus Stitt, 1940:19. Lygus hesperus Knight, 1941:151. This is the "legume bug" of Shull (1933) who completed a thesis project covering the life history and host preferences of this species in Idaho. Later Stitt (1940), working in Arizona, demonstrated that feeding by this species on alfalfa destroyed the ovaries of developing seed, and that hesperus is responsible for serious losses in alfalfa seed production. Lygus hesperus has been collected in all states along the 100th meridian and the other western states. It thrives best where there is enough moisture to grow alfalfa and other her- baceous plants. Hesperus has a wider distribu- tion than descrtinus, occurring at higher eleva- tions in all the mountains of the western states. This species is the most variable in color and size of any Lygus, and is best distinguished by. Fig. 249. Platylygus vanduzeei Usinger, 9. the the long rostrum which exceeds slightly apices of the posterior coxae. Records for the test site are shown in Table 3 Table 2. Collection records of Lygus hesperus at the Nevada Test Site. No. Host and no. collections Area Date' specimens Berula erecta (1) CE July 18 (1961) 3 Chrysothamnus viscidiflorus (3) 12M, 17M Aug. 5, 6, 27 39 Eriogonum deflexum (3) 12M, 16M Aug. 6. 11, 23 33 29 Eriogonum inflatwn (1) 16M Aug. 20 9 Eriogonum nodosum (2) 16M
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