290 PLANT DISEASES 



COTTON ANTHRACNOSE 

 (Collttotrichum gossypii, South w.) 



Either alone, or accompanying the fungus causing ' black 

 rust' (Cercospora gossypina, Cke.), this fungus does con- 

 siderable injury to the cotton crop in the southern United 

 States. On the * bolls ' or fruit the fungus causes depressed, 

 blackish spots, which ultimately assume a reddish tint, due 

 to the formation of spores. The leaves and stem are also 

 attacked, soon looking as if killed by frost; the stems 

 blacken, and the plant usually dies. 



Atkinson, Journ. Mycol., vol. vi. No. 4, p. 173, 2 pi. 



HOLLYHOCK ANTHRACNOSE 

 {Colletotrichum althaeae, Southw.) 



A fungus that has caused considerable trouble in 

 America to hollyhocks grown in greenhouses, and has 

 quadrupled their value in New York. Any part of the 

 plant may be attacked ; on the leaves brown spots are 

 formed, which may increase in size until the whole leaf is 

 diseased or withered. The spots vary from light yellowish- 

 brown to black. 



PREVENTIVE MEANS. Spraying with dilute Bordeaux 

 mixture at intervals, commencing as soon as the leaves 

 appear, although not effecting all that could be wished, 

 proved to be the best fungicide experimented with. Dis- 

 eased plants should be removed at once. 



Southworth, Journ. MycoL, vol. vi. No. 2, p. 45, i pi. 



