1908.] 



A New Tomato Disease. 



113 



Under the microscope the minute black bodies are recognised 

 as the fruiting body of the fungus, and the light brown mass 

 is found to consist of spores. These spores are exceedingly 

 small, measuring about ^i^-th of an inch in length and -yj^^th. 



Mr a 



A. — Tomato leaf attacked by the fungus Septoria Lycopersici, Speg. 



B, C. — Portions of diseased leaf (magnified). 



D- — Section through leaf, showing fruiting conceptacle (magnified). 

 E. — Spores of the fungus (highly magnified). 



of an inch in breadth ; they are divided into several divisions, 

 numbering from three to eleven. When the leaves are dried 

 up the spores fall to the ground, and are carried about by the 

 air or adhere to the glass, woodwork, poles, &c, where they pass 

 through the winter. They germinate next year again on tomato 



(3499) H 



