Family Labiatae 57 



veins of the leaves. Leaf spot has not been found in 

 the United States, but it is said to be common in 

 Europe. 



DISEASES OF THE CATNIP (Nepeta cataria) 



STEM ROT 

 Caused by Didymella cataria (C. and E.) Sacc. 



This trouble causes spots on the stems. The 

 disease was first found in New Jersey, but it is of 

 little importance. 



LEAF SPOT 



Caused by Septoria nepeta E. and E. 



Leaf spot is characterized by purplish brown cir- 

 cular spots which are surrounded by a band of deeper 

 brown. The disease was first found in Racine, Wis- 

 consin, and is apparently prevalent on the Canadian- 

 American border. 



STEM ROT 



Caused by Diplodinia herbicola (B. and C.) Sacc. 



Stem rot was first reported from Pennsylvania, but 



it is of no economic importance. 

 17 



