44 THE CURLY-TOP OF BEETS. 



Tage. 



Bibliography of curly-top of beets 37-40 



Blight, beet disease 9 



use of term 9 



western, beet disease 9 



Brown, N. A., investigation of curly-top 18 



Cabbages, Idaho, presence of beet leafhoppers 22 



Cages, isolation, use in study of cause of curly-top in beets, description, etc 14-18 



Carnation, effect of aphides, thrips, etc 31, 32, 33 



Citrus trees. See Trees, citrus. 



Cobb, N. A., study of stigmonoses 31,33 



Conclusion of bulletin 35-36 



Curly-leaf, beets, use of term 9 



top, beets, bibliography 37-40 



cause 20-21 



experimental study in Utah 13-14 



studies and experiments 13-18 



theories 13 



use of isolation cages in study 14-18 



characteristics 31-33 



damage to beet-seed production 9 



description, causes, conditions, etc., summary of studies 33-35 



destruction of young beets 11 



influence of climatic conditions on severity of disease 34 



initiation of disease by beet leafhoppers, time and manner. . . 25-28 



internal symptoms, description 11 



other names for disease 9, 10 



outbreak, effect of climatic conditions 21-22 



favorable conditions 21-22 



in Utah experimental field, history 18-19 



possible causes, list 13 



prevention, advantages of early planting 19-20 



relation to stigmonoses and mosaic 31-33 



resemblance to stigmonoses 31-33 



responsibility of leafhopper, studies and experiments 25-28 



seed, effect 24-28 



progeny healthy 31 



responsibility for nonproduction 29-31 



symptoms and description 12-13 



seriousness of disease 24 



similarity to mosaic 32 



successive outbreaks, improbability 31 



Bymptoms, description 9-13 



external, description 9-10 



vein, description 13 



See also Leafhopper. 

 Disease, beets. See Curly-top and Leafhopper. 



Dock, food for leafhoppers in Idaho 21 



Dondea sp., host plant of beet leafhopper 22 



Emulsion, kerosene and whale-oil soap, use in control of leafhoppers 35 



Entomology, Bureau, studies of beet leafhopper, with recommendations 35-36 



Eutettix strobi, injury to beets 21 



tenella, host plants, list 22 



See also Leafhopper. 



181 



