4 DEPARTMENT OF AGRICULTURE BULS. 776-800. 



Department Bulletin No. 777. — Fattening Steers on Summer Pasture 



IN the South — Continued. Page- 



V. Summary of the four years ' summer fattening experiments 21 



Conclusions 23 



Department Bulletin No. 778. — The Rose Midge. 



Introduction 1 



History and distribution 2 



Description 2 



Life history. 4 



Seasonal history 4 



Food plants 4 



Experiments in control : 4 



Methods of control , 7 



Precautionary measures 8 



Literature cited 8 



Department Bulletin No. 779. — The Grain Bug. 



Introduction. 1 



History 2 



Distribution 3 



Food plants 4 



Character of injury 4 



Description 6 



Life history and development 10 



Seasonai development 16 



Habits of nymphs 18 



Habits of adults "20 



Natural enemies 28 



Control methods 32 



Associated species of plant bugs 33 



Summary 33 



Literature cited 34 



Department Bulletin No. 780. — Nosema Disease. 



Introduction. ' 1 



Name of disease 3 



Digestive tract of adult bees ' 4 



Cause of Nosema-disease . 7 



A three-year study of Nosema infection in an apiary 13 



Symptoms of Nosema-disease 21 



Methods employed in experimental studies 22 



Effect of Nosema infection on the colony and on the apiary 23 



Resistance of Nosema aphis to heating 29 



Resistance of Nosema aphis to drying 31 



Resistance of Nosema aphis to fermentation 33 



Resistance of Nosema aphis to putrefaction , . . . . 35 



Resistance of Nosem.a aphis to direct sunlight 37 



Period Nosema aphis remains virulent 39 



Infectiousness of brood-combs from Nosema-infected colonies ' 43 



Resistance of Nosema aphis to carbolic acid 44 



Effect of drugs on Nosema-disease 44 



Modes of transmission of Nosema-disease 46 



Diagnosis of Nosema-disease 48 



Prognosis in Nosema-disease 53 



Summary and conclusions 56 



Literature cited 58 



Department Bulletin No. 781. — Digestibility of Some By-products Oils. 



Introduction - 1 



Previous investigations 1 



Possible recovery and use of by-products oils 2 



Digestion experiments with men 3 



Apricot-kernel oil 4 



Cherry-kernel oil » 6 



Melon-seed oil 8 



Peach-kernel oil 10 



Pumpkin-seed oil 12 



Tomato-seed oil 14 



Discussion 15 



