Ornamental Plants 



411 



AZALEA 



Leaf-spot (Septoria) is common on the leaves. Gall 

 (Exobasidium sps.). — Leaves, flowers, or shoots are en- 

 larged and distorted. Diseased parts should be cut and 

 burned and the plant sprayed with Bordeaux mixture. 



BALM, SILVER 



Rust (Puccinia men- 

 thce Pers.). — Some 

 thirty species of the 

 mint family, including 

 peppermint, thyme, 

 catnip, monarda, are 

 affected by this rust. 

 It is recognized by 

 its sori, which are at 

 first cinnamon-colored, 

 later chestnut-brown. 

 Badly diseased leaves 

 curl and die. 



Infested refuse 

 should be burned. 



BAMBOO 



Smut ( Ustilago shir- 

 aiana Hem.). — The 

 short branches still 

 covered by the leaf 

 sheaths are attacked. 



Fig. 217. — Barberry rust enlarged. 

 After Stakman. 



Witches-brooms are frequently formed. It has been found 

 in this country on two species of bamboo. Diseased plants 

 should be burned. 



BARBERRY 



Rust {Puccinia graminis, Mcidium). — This is of chief 

 interest on account of the damage the other stages of the 



