CHAPTER VIII 

 SPECIFIC DISEASES OF TRUCK CROPS 



FAMILY AGARICACE.E 



In this important family of fungi we may consider 

 the ordinary cultivated mushroom, Agaricus campes- 

 tris. Few truckers as yet grow mushrooms on a large 

 scale ; but as food is getting scarce and its prices soar- 

 ing higher, more attention will no doubt be paid to 

 this important crop. 



DISEASES OF THE MUSHROOM {Agaricus 



campestris L.) 



Mushrooms are subject to few diseases. There are 

 but two which need concern the grower. 



Bacterial Spot 



Caused by Pseudomonas fluorescens (Fl.) Mig. 



This disease, although serious, seems to be re- 

 stricted as yet to the mushroom caves in St. Paul, Min- 

 nesota. The trouble was first described by Tolaas. l 



Symptoms. It is characterized by an unsightly 



1 Tolaas, A. S., Phytopath. 5 : 51-53, 1915. 



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