Minnesota Plant Diseases. ix 



Professor L. F. Kinney of the Rhode Island Agricultural Experiment Station ; Mr. 

 J. B. Ellis of Newfield, New Jersey ; and Professor G. Massee of Ke w Gardens, Lon- 

 don. To my wife I am greatly indebted for assistance in proof reading and in pre- 

 paring the manuscript and index. 



To the following Experiment Stations I am indebted for the loan of plates for 

 illustration: Kansas, Connecticut, New York (Geneva I, New York (Cornell), Illi- 

 nois, New Jersey, Massachusetts, Michigan, Rhode Island, Maryland. My thanks 

 are also due the Goulds Manufacturing Co. of Seneca Falls, N. Y., for the loan of 

 several electrotypes. 



Amongst the many well-known general works consulted, the following have 

 proved particularly useful and have been freely used : I wish here to acknowledge my 

 indebtedness: Diseases of Plants, Tubeuf and Smith; Pflanzinkrankheiten, Hartig 

 Diseases of Trees, Hartig (translated by SomervUk and Ward ; Zerzetzungser 

 scheinungen des Holies, Hartig; Spraying of Plants, Lodeman ; A Textbook of Plant 

 Diseases, G. Massee ; Die Natiirlichen Pflanzenfamilien, Engler and Prantl ; and the 

 older general works of Sorauer, von Tavel. Frank, Zopf and De EUry. 



I have made free use of the great literature of the bulletins and reports of the 

 United States Agricultural Experiment Stations and especially of Connecticut Experi- 

 ment Station Bulletin No. 142 and the Connecticut Report for 1903, both of which 

 were written by Professor G. P. Clinton. 



Where illustrations have been taken from other works credit is given in the 

 proper place ; I desire here to acknowledge my indebtedness to the following publish 

 en, for permission to copy illustrations : Julius Springer, Berlin ; Eduard Trewendt, 

 Breslau; Gustav Fischer, Jena ; The Clarendon Press, Oxford; Longmans. Green & 

 Co., New York; The Botanical Gazette, Chicigo; Macmillun & Co., London and 

 New York ; Wilhelm Engelmann, Leipzig. 



For the chapter arrangement of the descriptions of specific diseases in Part II, 

 I am indebted to the suggestion of Professor MacMillan. 



All figures designated as original were made by Mr. C. J. Hibbard under th< 

 Geological and Natural History Survey of Minnesota. The great majority were 

 made under the direction and with the co-operation of the author; the remainder 

 under the direction of other members of the survey staff. 



To the Board of Regents of the University of Minnesota is due the credit for 

 making financially possible the collection of material and illustrations and the publica- 

 tion of this work. 



I am particularly indebted to Professor Conway MacMillan, at whose suggestion 

 thr work was undertaken, and without whose advice and assistance the publication 

 would h\v; b:en impossible. 



