CONTENTS 



Introduction ..... 

 Wildfire in the Connecticut Valley 

 Wildfire in other sections . 

 Progress in investigations 

 Life history studies 



Overwintering of the bacteria 



Effect of freezing the bacteria 

 On the seed 

 In the soil 

 In cured leaves . 



In leaves which have been left in the field 

 Occurrence of lesions on stalks . 

 Occurrence of lesions on midribs 

 Relation of the condition of the plant to infection 

 Dissemination 

 Control measures .... 

 Sterilization of seed . 

 Sterilization of soil in the seed-bed 

 Sterilization of sash and plank . 

 Spraying and dusting seed-beds 



Conclusions from the experiments and practical applications 

 Frequency of application 

 Amount of material to be applied . 

 Relative cost of dusting and spraying 

 Dust V. liquid sprays . 

 Home-made v. commercial copper sprays 

 Best time of day for application 

 Absolute V. partial elimination of wildfire 

 Will clean beds, give clean fields . 

 Success by practical growers 

 Value of an arsenical in the fungicide 

 Dust burn and spray injury . 

 Secondary benefits 

 Conclusion .... 



Destroying diseased areas in the bed . 

 Removing all plants from a diseased field and 



plants ..... 

 Roguing without resetting 

 Picking off diseased leaves 

 Dusting the plants in the field . 

 Spraying with Bordeaux mixture in the field 



The outlook for 1923 



Condensed recommendations for control 

 Publications on wildfire cited in this bulletin 



resetting with healthy 



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