CONTENTS. 



Department Bulletin No. 901. — Grapevine Flea-beetles: Page. 



Introduction i 



History 2 



The grapevine flea-beetle 4 



The lesser grapevine flea-beetle 11 



Economic importance 20 



Predatory enemies 22 



Methods of control 23 



General summary 24 



Literature cited 26 



Department Bulletin No. 902.— The Western Cabbage Flea-beetle: 



Nature of injury 1 



Description 2 



Distribution . 3 



Reports of injury 4 



Food plants 7 



Seasonal history 8 



Life history and habits 9 



History and literature 13 



Natural enemies 13 



Control measures 14 



Recommendations 17 



Summary 20 



Literature cited 21 



Department Bulletin No. 903. — The Grape Phylloxera in California: 



California history. .. 1 



Accidental and natural spread 



Distribution of phylloxera in California 11 



Vineyard destruction 15 



Nomenclature and synonymy of the grape phylloxera 26 



Biology of the grape phylloxera in California." 27 



The radicicole 44 



The nymph and winged form 73 



Hymphicals or intermediate forms 82 



The sexual forms , 90 



The gallicole and its relation to California conditions 95 



Effects of water and heat on phylloxera 98 



Diffusion of phylloxera 100 



Summary 122 



Literature cited 127 



Department Bulletin No. 904. — The Production and Utilization of Corn 

 Oil in the United States: 



Origin of the corn-oil industry 1 



Degerminating corn 1 



Methods of degermination used 2 



Expelling the oil from corn germs 



Handling and disposing of the crude oil 11 



Handling and disposing of the oil cake 12 



Buying and shipping corn germs 13 



Utilization of corn oil 13 



Effect of color and condition of the corn on the yield and character of the 



oil 15 



Comparison of the oil-production operation in different mills 16 



Economics of corn-oil production 17 



Cost of expelling corn oil 17 



Production of edible oil '. 20 



The future of corn oil 22 



5 



