MAIZE BLIGHT 315 



On the oiher hand, if warm weather is suddenly followed 

 by a chill, fruit is usually formed in abundance. The disease 

 may appear during any period of growth of the host. 



PREVENTIVE MEANS. A difficult disease to combat; 

 perhaps burning after the corn has been gathered would be 

 to a certain extent effective in preventing a return of the 

 disease the following season. The most certain means of 

 effecting this, however, would be by the rotation of crops ; 

 and as maize impoverishes the soil to a very marked extent, 

 this course is, under all circumstances, advisable. 



Bancroft, Proc. Roy. Soc. Queensland^ vol. iii. p. 108. 



Helminthosporium gramineum, Erikss. Forms elongated 

 olive blotches on leaves of barley, the injury done being 

 in proportion to amount of fungus present. 



Helminthosporium teres, Sacc. Also attacks the leaves 

 of barley, forming long olive blotches, and causing the 

 leaves to shrivel. 



A form of this species Forma Avenae sativae, Briosi 

 e Cavara forms numerous narrow, elongated, dry patches 

 on the leaves of oats, and when in profusion arrests the 

 maturing of the fruit. 



SEEDLING PEA BLIGHT 

 {Brachysporium pisi, Oud.) 



Oudemans has described a disease which proves de- 

 structive to young pea plants (Ptsum sativum). 



The leaves show blackish mouldy patches, become 

 yellow, and soon die. The dark patches consist of myriads 

 of upright dark threads, each bearing a coloured, elliptical, 

 three-septate conidium at its tip. 



Preventive measures are not given, but probably dilute 



