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Show 1937] Knowlton: Control of the Beet Leafhopper in Utah 129 Chloropsca glabraJ 1 Sarcophagidae.. 17 adult and 2 larval Pipunculidae (larvae taken from leafhoppers), 1 Tachinidae, 4 midges, 1 Simuliidae, and 1 calli phoridae; 242 Hymenoptera of which 136 were ants in 49 stomachs, 5 Vespi dae, 1 Andrenidae, 2 Sphecidae, 1 Braconidae, 2 Chalcididae, 3 Chrysididae, 1 Ichneumonidae, and 1 larval dryinid ; numerous insect fragments. In addition, 53 spiders were found in 41 stomachs; 4 mites; 1 scorpion; 1 sowbug; a few small dry plant fragments; some sand and a few small 'pebbles. 3. An examination of 373 stomachs of brown-shouldered utas, collected among shadscale, greasewood, and other plants of little or no importance as beet leafhopper host plants, for the same seasons showed the following insect material to be recognizable: 20 Collembola in 5 stomachs; 297 Orthoptera in cluding 126 adult and 164 grasshopper nymphs in 185 stomachs; 4 Odonata; 6 Neuroptera, 2 being adult and 3 larval Chrysopidae; 183 Hemiptera includ ing 29 adult and 17 nymphal Geocoris, 15 Nysius ericae, 7 Pentatomidae; 146 Homoptera including 55 adult and 32 nymphal Euteitix tenellus and 13 leaf hoppers of other species in 9 stomachs, 33 aphids, 1 nymphal psyllid, 8 Coccidae, and 2 Membracidae; 136 Coleoptera (8 of which were larvae) including 26 Carabidae in 15 stomachs, 1 Histeridae, 3 Silphidae, 1 Coccinellidae, 2 Tene brionidae; 83 Diptera including 6 adult and 4 larval Pipunculidae, 2 mosqui toes, 3 midges, 1 Tipulidae, and 1 Dolichopodidae; 518 Hymenoptera, includ ing 394 ants in 63 stomachs; 1 Sphecidae, 9 Andrenidae, 9 Chalcididae, 3 Vespidae, 5 Ichneumonidae, and 1 Chrysididae; numerous insect fragments. In addition to the above insects, 30 spiders in 29 stomachs; 4 mites ; 1 scorpion; 2 sow bugs; and 1 small lizard. Uta s. stansburiana at Timpie.-The brown-shouldered uta is rather abundant among Russian thistle and other host plants of the beet leafhopper in the foothills southeast of Timpie, and 642 specimens were collected between 1930 and 1934. It is estimated that approximately 200 per acre. occur at this locality. An examination of their stomachs showed them to contain: 3 Thy sanura; 47 Collembola in 15 stomachs; 19 Orthoptera, 15 being grasshoppers in an equal number of stomachs; 7 N europtera; 30 Odonata, 19 being damsel ·6 flies; Thysanoptera; 2530 Hemiptera, including 212 Nysius ericae, the false chinch bug and 2104 Geocoris or big-eyed bugs, of which 966 were nymphs; 3538 Homoptera, of which 932 were adults and 799 nymphs of the beet leaf hopper (this number was increased to 4126 tenellus in 602 stomachs at the end of 1935), 17 other leafhoppers and 10 aphids; 223 Coleoptera,. including 38 larvae; 150 Lepidoptera, of which 34 were caterpillars;' 437 Diptera, 134 being Pipwnculus; 817 Hymenoptera, 534 being ants; 2 Dryinidae larvae, probably parasites digested from beet leafhoppers; 75 spiders; 12 mites; 3 pill bugs; 3 scorpions; and numerous unidentified insect fragments. This lizard evidently is an important factor, in this locality in the control of E. tenellus. An examination of 207 stomachs of brown-shouldered utas, taken in the same locality but among plants commonly of little importance as hosts of the beet leafhopper, a less liberal 'and somewhat different food supply was evi dent, consisting of: 1 Collembola; 223 Orthoptera, all but one being grass hoppers, of which 130 were nymphs; 1 Odonata ; 2 N europtera; 63 Hemiptera, 4 being false chinch bugs and 22 Geocoris J' 5 Homoptera, all being beet leaf hoppers, including 3 nymphs; 31 Coleoptera; 16 Lepidoptera, 9 being larvae; 55 Diptera; 81 Hymenoptera, 79 being ants; 5 spiders; 1 fragment of a lizard. Lizard Control at Delle-=During the years 1929 to 1933, inclusive, a study was conducted of the desert breeding grounds of the beet leafhopper in a small area along the Wendover highway, approximately six miles north west of Delle, in Tooele County. The tenellus population at this place fluctu ated from year to year, depending largely upon the adequacy of precipitation. |
