CONTENTS. O 



Department Bulletin No. 834. — Black-grain-stem Sawply of Europe in 



the United States: Page. 



Introduction 1 



History of discovery of the insect in America 2 



Common name of the species 3 



Distribution 3 



Food plants . 5 



Synonymy and description of Trachelus tabidus 7 



Manner of work and probable life history 9 



Extent and character of injury 11 



Parasites 12 



Suggestions for control 12 



Literature cited 14 



Department Bulletin No. 835. — Capillary Movement of Soil Moisture: 



Object 2 



Plan of experiments 2 



Rate and extent of movement of soil moisture by capillarity 13 



Effect of gravity on the movement of soil moisture by capillarity 39 



Evaluation of empirical curves 47 



Open versus covered flumes 54 



Effect of temperature on soil-moisture conditions 56 



The capillary siphon 58 



Capillary movement of moisture from a wet to a dry soil 63 



References 66 



Department Bulletin No. 836. — Broom-corn Experiments at Woodward, 

 Okla.: 



Experiments with broom corn 



Description of the district 2 



Topography 2 



Soil : 2 



Climatic conditions 3 



The Woodward Field Station 10 



The broom corns . 10 



Classification 10 



Experimental conditions 11 



Varietal experiments. . „ 16 



Date-of-seeding experiments 26 



Comparative yields in the date-of-seeding experiments 29 



Rate-of-seeding experiments 30 



Comparative yields in the rate-of-seeding experiments 33 



Combined rate-of-seeding and spacing experiments 34 



Harvesting experiments • 47 



Wearing quality of the brush 49 



Nursery experiments 49 



Conclusions 53 



Department Bulletin No. 837. — Control of the Grape-berry Moth in 

 Northern Ohio: 



Introduction 1 



History in Ohio , 2 



Northern Ohio conditions affecting infestation 2 



Varietal infestation 4 



Seasonal history 4 



Relation between seasonal-history data and control measures 5 



Natural control of first-brood larvae 6 



Control experiments 7 



Conclusions 26 



Recommendations 26 



Department Bulletin No. 838. — Cypress Bark Scale: 



Economic importance 1 



History 2 



Native host plant 2 



Distribution and spread 3 



