CONTENTS. Vn 



Depabtment Bulletin No. 62. — Tests op the Waste, Tensile Strength, 

 AND Bleaching Qualities of the Different Grades of Cotton as 



Standardized by the United States Government — Continued. Page. 



Nature of the cotton secured for the experiments 5 



Percentage of waste 6 



Valuation of the waste 6 



Tensile strength of the yarn 6 



Length of staple used i 7 



Conditions under which the experiments were made 7 



Summary 8 



Department Bulletin No. 63. — Factors Governing the Successful 

 Shipment of Oranges from Florida. 



Introduction 1 



Location of the Florida citrus industry 1 



History of the Florida citrus industry 2 



Methods of handling the Florida orange crop 4 



Keeping quality of Florida oranges 12 



History of the Department work in Florida 13 



" Blue-mold decay of the orange 14 



Evolution of the Florida citrus industry 17 



Inspections of picking crews and foremen - 19 



Proper field equipment 24 



Influence of cleaning operations upon decay 25 



Packing and shipping experiments 29 



Seasonal influences on the occurrence of decay 43 



Precooling 45 



Stem-end rot , 46 



Summary 47 



Conclusions 48 



Department Bulletin No. 64. — Potato Wilt, Leaf-boll, and Related 

 Diseases. 



Introduction 1 



Appearance of new troubles 3 



Fusarium wilt 5 



Description of diseased plants 5 



Occurrence of the causal fungus 6 



Soil relation of fusarium wilt 8 



The parasitism of fusarium oxysporum 8 



Climatic relations and geographic distribution of fusarium wilt 10 



Control of fusarium wilt 12 



Tests for fusarium infection of seed potatoes 13 



Sources of seed potatoes 14 



Control of wilt through rotations 14 



Resistance of varieties to wilt 15 



Effect of fertilizers on wilt 15 



Quarantine measures 15 



Occurrence of American fusarium wilt in Europe 16 



Verticillium wilt 16 



Description of the diseased plants 16 



Geographic distribution 17 



Leaf-roll 18 



Literature of the disease 18 



Description of leaf-roll 19 



Noncommunicability of leaf-roll - 24 



Relation of fungi to leaf -roll 25 



