Symptoms 



Pale green, later dry whitish or brown spots 

 caused by Mycosphaerella brassicicola. Same 

 measures as for white rust. 



CaIjOEOLABIA. 



Sudden wilting of plant. Cause doubtful, 

 but of fungus origin, probably a species of 

 Phytophthora which enters from the soil. Re- 

 move and destroy affected plants (4) ; practise 

 rotation (8) ; sterilise soil in which plant is 

 propagated ; Hme soil. 



Callistephtjs hortensis (China Aster). 



Sudden wilting of plant due to Phytophthora. 

 Measures as with Calceolaria wilt. 



Cam tjit.t.ta . 



Foliage. — ^Rounded or irregular blotches, 

 silvery white, with a distinct margin. Blotch 

 with minute black dots. Pestalozzia Guepini. 

 Remove and burn diseased leaves ; sponge 

 with Bordeaux mixture. 

 Cabnation. 



Stem. — ^Yellow spot on deformed side of 

 stem, due to Fusarium sp. (? dianthi). Destroy 

 portions affected (3) ; practise rotation (8) ; 

 sterilise soil. 



Foliage. — Rusty heaps of spores ; when these 

 fall, leaving light yeUow spots. Rust. Uromy- 

 ces caryophyllinus. Maintain dry atmosphere ; 

 destroy affected parts (3) ; spray with Bordeaux 

 mixture or liver of sulphur (7). Roundish 

 73 



