MAIZE BLIGHT 315 



On the other 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. 



Helniinthosporium graviineum, 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 Avenue 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 {Pisum 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 



