x Preface 



prevented. Can any one say that such a saving 

 would be insignificant, untimely, or unpatriotic? 



The present work has been prepared with the aim 

 of stimulating more research in truck-crop diseases, 

 and also of assisting the trucker to make use of our 

 present knowledge, in order to prevent avoidable 

 losses, increase the trucker's profits, and assure a 

 greater food supply. The writer seriously solicits 

 suggestions or criticisms on his work. 



Acknowledgments are due to Dr. and Mrs. D. de 

 Sola Pool, of New York City, for the inspiration, the 

 encouragement, and the valuable assistance rendered 

 in the preparation of the manuscript, and later in 

 reading and criticizing it. To Dr. E. A. Bessey of 

 the Michigan Agricultural College, and to Dr. Mel. 

 T. Cook of Rutgers College, the author owes hearty 

 thanks for the careful reading and the valuable 

 suggestions and criticisms which they have given this 

 work. Acknowledgments are also due to Dr. G. 

 H. Coons of the Michigan Agricultural College, to 

 Prof. F. B. Paddock and to Mr. W. T. Brink of the 

 Texas Agricultural Experimental Station for reading 

 the manuscript and proof. Grateful appreciation is 

 likewise due to Dr. I. Adlerblum of the Metropolitan 

 Life Insurance Co. of New York City for criticizing 

 the manuscript and proofs. 



For the use of illustrations the author is indebted : 

 to Dr. G. P. Clinton; to Dr. Mel T. Cook; to Drs. 

 G. H. Coons and E. Levin; to Dr. H. A. Edson; to 

 Dr. B. B. Higgins; to Prof. H. S. Jackson; to Dr. L. 

 R. Jones; to Dr. T. F. Manns; to Prof. A. V. Osmun; 



