INDEX. 45 



Tage. 



Flea-beetle, hop, comparison with beet leafhopper 36 



enemy of sugar beets, control, studies by Bureau of Ento- 

 mology 36 



Fly, white, damage to citrus trees 22 



description, habits, etc 22-23 



use of name for beet leafhopper in West 22 



Fungi, leaves, possible cause of curly-top in beets 13 



roots, possible cause of curly-top in beets 13 



Greasewood, host plant of beet leafhopper 22 



Hairy-root, beet disease 10 



"Hopper-dozer," use in control of beet leafhopper 35 



Hosts, Eutettix tenella, list 22 



Insects, possible cause of curly-top in beets 13 



Introduction to bulletin 9 



Irrigation, use in control of beet leafhoppers 36 



Isolation cages. See Cages, isolation. 



Jamieson, C. 0., investigation of curly-top 18 



Juices, plant, extraction not sufficient to account for curly-top in beets 20-21 



Kerosene and whaleoil-soap emulsion. See Emulsion. 



Leaf-curl, beets, seed and sugar, types and symptoms 28-29 



Leafhopper, beet, comparison with hop flea-beetle 36 



description, habits, etc 22-23 



host plants 22 



initiation of curly-top in sugar beets, time and manner, 



study and experiments 25-28 



origin in southwestern United States 22 



probable cause of curly-top 13-18 



recognition, importance to beet growers 24 



responsibility for curly-top, studies and experiments 25-28 



summary of studies 33-35 



Leafhoppers, beet , capturing, methods and devices 35-36 



control, cooperative experiments with Bureau of Ento- 

 mology 35-36 



experiments in Colorado and Utah 36 



methods 35-36 



recommendations by Bureau of Entomology 35-36 



use of irrigation 36 



damage, preventive measures, control methods, etc 36 



to beet leaves, studies and experiments in Utah. . 14 



history, hibernation places, etc 35-36 



invasion, barriers, natural and artificial 22 



nymphs and adults, comparison of damage 18 



experiments by Office of Sugar-Plant 



Investigations 18 



presence on cabbages in Idaho 22 



See also Curly-top. 

 Leaves, beets. See Beets, leaves. 



Moisture, abnormal supply, possible cause of curly-top in beets 13 



Mosaic, beets, relation to curly-top 32, 33 



Mother beets. See Beets, mother. 



Moulton, study of stigmonoses 31, 33 



Nymph, beet leafhopper, more harmful than adult 18 



181 



