Leafhopper and Planthopper Populations on Eight Irrigated Grasses Grown for Livestock Forage

Seven leafhoppers and a planthopper, Delphacodes campestris</it> (Van Duzee), occurred on all 8 cool-season grasses but densities were significantly different on different hosts. Endria inimica</it> (Say) was the most abundant leafhopper on all grasses but preferred Bromus inermis</it> Leyss. and, B. albidus</it> M.B. Psammotettix alienus</it> (Dahlbom) was most abundant on Bromus</it> spp. and Phalaris arundinacea</it> L. P. lividellus</it> (Zetterstedt) and Macrosteles fascifrons</it> (St'l) preferred Alopecurus arundinaceus</it> Poir. Exitanus exitiosus</it> (Uhler) was most abundant on Agropyron intermedium</it> (Host) Beauv. and Elymus junceus</it> Fisch; Forcipata loca</it> Delong & Caldwell on Dactylis glomerata</it> L., Festuca arundinacea</it> Schreb. and A. arundinaceus</it>. Balclutha abdominalis</it> (Van Duzee) did not exhibit significant host preferences. D. campestris</it> was most abundant on A. intermedium</it>, E. junceus</it>, and F. arundinacea</it>. Relative abundance of several leafhoppers varied seasonally on different hosts. Nonpreferred hosts tended to have highest leafhopper populations in the spring.