Ornamental Plants 427 



first minute, pale, with brownish or yellowish borders, or 

 they spread over the leaf as a reddish discoloration. In 

 late stages they are uniformly brown, with dark hyphae 

 scattered over the central portions. The dead areas enlarge 

 irregularly, and the leaves finally curl and die. 



Bordeaux mixture and ammoniacal copper carbonate, used 

 once a week, have proved effective remedies. 



MORNING-GLORY, MOON-FLOWER 



The following are common but usually not serious: 



Rust {Coleosporium ipomcem (Schw.) Burr.); White-rust 



(Albugo ipo7noece-pandurance) ; Leaf -spots due to various 



fungi. 



NASTURTIUM {Tropoeolum) 



Blight (Pseudomonas aptatum). — • In this disease the leaves 

 are wilted and bear water-soaked spots usually about 3-5 

 mm. in diameter. Black-mold (Pleospora tropocoli Hal., 

 Alternaria). — The leaves which are affected turn light green, 

 later yellow, and still later are covered with a black mold. 



Damping-off (Colletotrichum). — Damping-off due to a 

 species of Colletotrichum is common in the cutting-bed. 

 The diseased parts bear numerous black acervuli. 



White-rust (Albugo Candida) occurs rarely. 



OLEANDER 



Kjiot, gall "■'' (Bacillus). — This disease both upon leaves 

 and stems appears to be identical in character with that upon 

 the olive. 



ORCHIDS 



Mold (Botnjtis). — The presence of straw-colored spots 

 often renders the plants unsightly and the flowers valueless. 

 A gray mold similar to that found upon the lily appears later. 



All infested refuse should be burned. 



