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Show Knowlton: 1937] Control of the Beet Leafhopper in Utah 135 Gir., P. douglassi ornatum (Gir.), Sceloporus elo!"gatus Stej., and Eumeces skiltonianus (B. and G.), have been found to occasionally feed upon beet leaf hoppers. Studies to date indicate that most of these species were of small importance as beet leafhopper predators, due either to small numbers or to a preference for ants, larger insects, or a habit of seldom feeding in areas in fested by large numbers of E. tenellus. Table 9. Beet leafhoppers found in stomachs of the lizard, S celoporus graciosus graciosus, taken among host plants of Euteitix tenellus in Utah localities, 1930-1935. No. S. g. g. No. Lizards Locality 'Blanding II Blue Creek II Cedar Creek II Cedar Spring II Cliff II Clover II Curlew II The Delle II Farmington Canyon II Fishers Pass I! Flux II Grantsville II Hardup II Iosepa II Kanab II Kelton II Lampo II Mills Junction II Mt. 'Carmel II Oolitic II Orem II Orr's Ranch II Raft River Mts. II Showell II Snowville II Spring City II Timpie II Totals /I 12 1 3 2 1 2 1 1 1 1 1 12 57 13 1 7 5 1 2 3 18 33 1 14 24 Etttettix tene}lus in stomachs containing ienellus I I II II II /I /I /I /I /I II /I /I /I /I I /I I ,11 2 2 I 221 /I 4 1 1 2 1 2 1 1 1 1 1 7 17 4 1 6 1 1 2 1 10 3 1 4 4 1 1 80 Adults /I /I /I 1 Nymphs 8 2 1 7 3 2 0 1 18 1 3 17 23 3 I I /I /I /I I I /I /I /I I I I I I I I I II I I I I I I 1\ I 1 I 5 /I 7 I I II 1 9 /I /I 16 3 2 157 I I I I I I I o Total 15 8 3 3 8 3 2 1 2 18 1 3 32 28 51 3 6 2 1 2 1 o o 1 1 o o o o 43 2 o o o 5 o o 19 18 o 0' 1 28 34 3 2 39 296 50 4 1 5 2 16 7 Bird Predators Birds are effective predators of the beet leafhopper where E. tenellus A study of the stomachs of 428 small birds, taken ?ccurs in large numbers. III desert breeding areas of the beet leafhopper and in occurred in reasonable conducted abundance, areas where this insect during th fall of 1934 (24), showed 153 of the stomachs to contain 1498 nymphal and 350 adult tenellus, totaling 1848 specimens, in recognizable condition. This undoubtedly repre sented only a part of the insect food consumed by each bird, as leafhoppers probably are reduced to an unrecognizable condition within a few hours. |
