CONTENTS. 5 



Department Bulletin No. 533. — Extension of Cotton Production in 



California — Continued: Page. 



Community control of gins and oil mills 12 



Agricultural advantages of community organization 13 



Conclusions 14 



Publications on cotton culture 16 



Department Bulletin No. 534. — Apple Blotch and Its Control: 



Introduction 1 



Description of apple blotch 2 



Cause of the disease 3 



Review of the literature 3 



The fungus 4 



Cultural relations 8 



Weather conditions 8 



Relative susceptibility of apple varieties 9 



Remedial measures 9 



Summary 10 



Literature cited 11 



Department Bulletin No. 535. — The Horse-radish Flea Beetle: Its 

 Life History and Distribution: 



Introductory 1 



Descriptive 3 



Distribution in North America 5 



Origin and dissemination 6 



Review of literature 7 



Food plants 8 



Seasonal history 8 



Recent injury 12 



Natural enemies 13 



Associated insects 13 



Methods of control 13 



Summary 14 



Bibliography 15 



Department Bulletin No. 536. — The Mediterranean Fruit Fly in Hawaii: 



Introduction 1 



Common names 2 



Origin 2 



Distribution 3 



Source of Hawaiian infestation 8 



Conditions favorable to establishment in the Hawaiian Islands 9 



Economic importance 15 



Injury 16 



Methods of spread 18 



Host fruits 21 



Life history and description 49 



Seasonal history 75 



Natural control 77 



Artificial control 101 



Summary 116 



Department Bulletin No. 537.— The Results of Physical Tests of Road- 

 building Rock in 1916, including all Compression Tests: 



Introduction 1 



Crushing strength or compression test 1 



Interpretation of results of physical tests 2 



Table I. — Results of physical tests of road-building rock in 1916 3 



Table II.— Results of compression tests of rock to January 1, 1917 17 



Table III. — Geographical distribution of rock samples tested to January 1, 



1917 22 



Table IV.— General limiting test values for broken stone 23 



Department Bulletin No. 538. — Shrimp: Handling, Transportation, 

 and Uses: 



Icing 1 



Heading 2 



Cooking 2 



Preparing cooked shrimp for market 5 



Packing raw shrimp for shipment 6 



