CONTENTS. 9 



Bulletin No. 182. — Ten Years' Experience with the Swedish Select 

 Oat — Continued. 



Results of trials in this country — Continued. 



Trials by farmers — Continued. Page. 



Montana 22 



Michigan 23 



South Dakota 24 



New York 25 



Wisconsin 25 



Miscellaneous - — 28 



Interesting individual trial 29 



Recent reports 30 



Quality of the kernel in the Swedish Select oat 31 



Chemical analyses 35 



Value of the introduction 35 



Index 39 



Bulletin No. 183. — Field Studies of the Crown-Gall of the Grape. 



Introduction 7 



Historical notes 8 



Distribution and importance of crown-gall 9 



Geographical distribution of the disease 9 



Distribution of the disease on species and varieties of grapes — 10 



Distribution of the disease on young and old vines 10 



Importance of the disease 10 



Description of the forms of crown-gall 11 



Root galls 11 



Cane galls 11 



Other manifestations of the disease 12 



Development of the forms of crown-gall 12 



Development of root galls 12 



Development of cane galls 13 



Development of the disease on seedlings 14 



Development of the disease in vineyards 14 



The effect of crown-gall 14 



The susceptibility and resistance of species and varieties of grapes 



to crown-gall 15 



The susceptibility of varieties of European grapes 16 



The resistance of varieties of American grapes 18 



The cause of crown-gall 20 



The communicability of crown-gall 22 



Observations by other investigators 22 



Results of experiments 22 



Experiments with seedlings 22 



Experiments with older vines 24 



The cure of crown-gall 25 



Negative results from experiments with fungicides 25 



The prevention of crown-gall 26 



Resistant vines should be planted on their own roots 26 



Resistant stocks should be used for grafting nonresistant va- 

 rieties 27 



Other means of prevention 27 



Summary and recommendations 2S 



Index to literature 31 



Description of plates 36 



Index 37 



