100 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



Plant Diseases: i 



Diseases of Watermelons . - ; F. B. 1277 



The Control of Sap-Stain, Mold, and Incipient Decay in Green 



Wood with Special Reference to Vehicle Stock D. B. 1037 



Kernel Spot of the Pecan and Its Cause D. B. 1102 



Internal Browning of the Yellow Newtown Apple D. B. 1104 



Seedling Blight and Stack-Burn of Rice and the Hot-Water 



Seed Treatment D. B. 1116 



Investigations of Heat Canker of Flax D. B. 1120 



Decays and Discolorations in Airplane Woods D. B. 1128 



Symptoms of Wheat Rosette Compared with Those Produced by 



Certain Insects D. B. 1137 



The Influence of Copper Sprays on the Yield and Composition of 



Irish Potato Tubers D. B. 114ft 



Investigations of Potato Wart D. B. 1156. 



Anthracnose of Muskmelons — D. C. 21T 



White-Pine Blister Rust in the Western United States— D. C. 22& 



Eastern Blue-Stem of the Black Raspberry D. C. 227 



Bacterial Spot of Cucumbers D. C. 234 



Commercial Control of Citrus Melanose D. C. 259 



Kill the Common Barberry with Chemicals D. C. 26& 



Barberry Eradication Prevents Black Rust in Western Europe. D. C. 269 

 Tractors and Motor Trucks: 



Tractors on Southern Farms — . _ F. B. 1278 



What Tractors and Horses Do on Corn Belt Farms F. B. 1295 



Changes Effected by Tractors on Corn Belt Farms F. B. 1296 



Cost of Using Tractors on Corn Belt Farms F. B. 1297 



Shall I Buy a Tractor? , F. B. 1299 



Choosing a Tractor __— F. B. 1300 



Motor Trucks on Corn Belt Farms F. B. 1314 



Truck and Garden Crops: 



Celery Growing F. B. 126& 



The Preparation of Fresh Tomatoes for Market F. B. 1291 



Marketing the Early Potato Crop F. B. 1316 



Greenhouse Construction and Heating .__ F. B. 1318 



The Production of Cucumbers in Greenhouses . _1^'J^__ F. B. 1320 



Seed Potatoes and How to Produce Them ___!!lL___ F. B. 1332 



Group Classification and Varietal Descriptions of American Va- 

 rieties of Sweet Potatoes : D. B. 1021 



A Study of Sweet-Potato Varieties with Special Reference to 



Their Canning Quality — - — —- — D. B. 1041 



Frost Injury to Tomatoes . _ — i:^-l}-L- D. B. 109» 



United States Grades for Potatoes Recommended by the United 



States Department of Agriculture- __ ___i._l__i:_l;_^j..l_ D. C. 238 



;5.';i.';!'.';r!vi ii<; 



