6 DEPARTMENT OF AGRICULTURE BULS. 1026-1050. 



Department Bulletin No. 1035. — The Red Spider on the Avocado: Page. 



Intxoduction I 



^ Economic importance 1 



Nature of injure to foliage 2 



Food plants and distribution 2 



Description and habits 4 



Biological data 7 



Predatory enemies 9 



Spraying experiments 11 



Spray rod versus sprav gun 13 



Cultural methods in the grove 14 



Recommendations 15 



Department Bulletin No. 1036. — Coal-tar and Water-gas Tar Creo- 

 sotes — Their Properties and Methods of Testing: 



Foreword 1 



Part I. Tars and the production of creosotes from tars 3 



Chapter I. Introduct'on and definitions 3 



Chapter II. Composition of tars and methods of manufacture 7 



Chapter III. Production of creo?ote from tars 19 



Part II. Experimental comparison of authentic specimens of creosote 23 



Chapter I. Collecting and testing the specimens of creosote 23 



Chapter II. Determining certain conditions for the tests 35 



Chapter III. Results of the tests 38 



Chapter IV. Comparison of the properties of authentic coal-tar creo- 

 sotes with those of authentic water-gas- tar creosotes 44 



Part III. Properties of creosotes 47 



Chapter I. Composition and chemical properties of coal-tar creosotes. 47 



Chapter II. Phvsical properties of coal-tar creosotes 50 



Chapter III. Toxic properties of coal-tar creosotes 66 



Chapter IV. Composition and properties of water-gas-tar creosotes 73 



Chapter V. Comparison of the properties of commercial coal-tar creo- 

 sotes and commercial water-gas- tar creosotes 77 



Chapter VI . Tar-creosote solutions 79 



Chapter VII. A theory of the mechanism of the protection of wood by 



oil solutions 84 



Part IV. Methods of testing creosotes and official specifications for creosote. 87 



Chapter I. Practical methods of testing creosotes 87 



Chapter II. Specifications now in force by various associations 103 



Appendix 106 



Bibliography , 112 



Department Bulletin No. 1037. — The Control of Sap-stain, Mold, .and 

 Incipient Decay in Green Wood, with Special Reference to Vehicle 

 Stock: 



Introduction 1 



Sap-stain - 3 



Other fungous organisms causing surface discolorations in green timber. . . 12 



Factors which favor the growth of sap-stain and mold fungi 14 



Durability of stained or molded wood 1" 



Losses due to sap-stain or mold 18 



Control measures 21 



Summarv §0 



Literature cited 52 



Department Bulletin No. 1038. — Pecan Rosette — Its Histology, Cy- 

 tology, and Relation to Other Chlorotic Diseases: 



Tvpes of chlorotic plant diseases 1 



Chloroses due to soil or atmospheric conditions 2 



Infectious chloroses ^ 



Studies of pecan rosette 1-^ 



Results of previous work ^^ 



External signs of rosette 1 ^ 



Histological and cytological studies 19 



Subsidiary experiments -^^ 



Probable nature of pecan rosette 31 



Summary 36 



Literature cited 37 



