ORNAMENTAL PLANTS 477 



SEDUM 



Septoriose {Septoria Sedi Westd.). — Dark, circular 

 blotches appear upon the leaves and result in such 

 defoliation that the stems often become naked nearly to 

 the tips of the branches. 



Infected parts should be burned. 



Vermiculariose (Vermicidaria Telephii Karst.). — This 

 disease usually appears first at the point of attach- 

 ment of the leaves, and later it passes to the stem, causing 

 soft rot and shrinking of the outer parts. After defolia- 

 tion the disease spreads slowly toward the base of the 

 stem. 



Infected parts should be burned. 



SNAPDRAGON 



CoUetotrichose, anthracnose (Colletotrichum antirrhini 

 Stew.). — This disease which often ruins the crop is the most 

 destructive of this host, both under glass and in the open. 

 It attacks plants of any age, producing on the stem ellip- 

 tical sunken spots, 5-8 mm. long, and on the leaves circular 

 dead spots. These are at first dirty white with narrow 

 brown margin ; later acervuli appear in the center, at first 

 brown, then black. Diseased plants show numerous dead 

 hanging leaves. The ^ems or lateral shoots may be 

 girdled, killing the parts beyond. 



It is recommended to use only healthy plants for cuttings 

 and to clean up and burn all diseased refuse. The cuttings 

 should be spraj^ed as soon as well rooted and repeatedly 

 until transplanted. Excess of water should be avoided 

 and thorough ventilation provided. 



Phomose {Phoma sp.). — This is a disease of sue- 



