TOMATO LEAF RUST 313 



PREVENTIVE MEANS. Spraying with dilute potassium 

 sulphide solution, or with dilute Bordeaux mixture, will 

 check the disease if resorted to sufficiently early, and 

 repeated at short intervals. If the disease has previously 

 existed, spraying should be commenced before the disease 

 appears. Diseased plants should be removed to prevent 

 an epidemic. 



Plowright, Gard. Chron., Oct. 29, 1887, figs. 

 Galloway, Ann. Rep. U.S. Dept. Agric., 1888, p. 347, 

 i pi. 



Cladosporium elegans, Penzig. This fungus appears as 

 minute blackish tufts seated on arid spots on living orange 

 leaves in Italy. The specific diagnosis proves this to be 

 distinct from the United States species, causing 'scab' 

 on leaves and fruit of the lemon. To which species the 

 fungus causing a somewhat similar disease in Japan and 

 Australia belongs, cannot be determined in the absence of 

 specimens. 



MAIZE BLIGHT 



(Helminthosporium turdcum. Pass. 

 = Helminthosporium inconspicuum, Cke. and Ellis.) 



This fungus often proves destructive to maize or Indian 

 corn (Zea mays), and has been recorded from Southern 

 Europe, Queensland, and the United States. Small pale 

 patches appear on the leaves, and continue to increase 

 in size and run into each other, forming large patches, until 

 finally the greater portion of the blade is covered, the 

 midrib alone remaining rigid. The spots finally change to 

 a pale brown, often with a darker border, and are more or 

 less covered at this stage with a very delicate dusky mould, 



