Prefatory Note xv 



by which the various diseases may be distinguished. 

 These descriptions are made in non-techmcal lan- 

 guage so that the practical grower can understand 

 them and recognize the diseases in question. Besides 

 this the methods of control are also described in popu- 

 lar terms. The author's long study of the subject has 

 made it possible for him to approach this part of the 

 work from the standpoint of the grower, so that as 

 far as possible the remedies or preventive measures 

 recommended are those with which he has practical 

 experience. Occasionally it is impossible to recom- 

 mend a remedy since sometimes a disease is of such a 

 natxare that by the time it becomes apparent the 

 damage is done. But eveii in such cases directions 

 are given which wUl reduce the loss or at least 

 permit its avoidance another season. , The discus- 

 sions as to the cause of the disease are tmavoidably 

 given in somewhat more technical form from the 

 very nature of the case, especially where it is the 

 question of diseases caused by fungi or bacteria 

 for which brief scientific characterizations are neces- 

 sary. These technical discussions are essential for 

 pathologists and other students of the subject so 

 that the book will be appreciated by Experiment 

 Station workers, Extension Specialists, coUege stu- 

 dents, and others, as well as by the truck growers 

 themselves for whom the book is primarily intended. 



Ernst A. Bessey, 



Professor of Botany, 



Michigan Agricultural College. 



