PLATE 2] 



Walnut disease. 



Bacterial black spot of the Persian walnut (Juglans regia). more commonly known as the English walnut. Half-developed green h-uits from an 

 orchard in California, showing the badly spotted epicarp ; spots due to Bacterium juglandis (Pierce). Leaves and shoots are also subject to this 

 disease, which has become serious in Southern California, where large quantities of these nuts are grown for market. The attacked parts are 

 conspicuously blackened as if charred. The numerous small white spots show the locarion of groups of stomata. Infection takes place readily 

 through unbroken tissues. 



