6o FUNGOID DISEASES 



found, by means of a pocket lens ; these are the 

 fruit capsules of the fungi present. 



Cause. — According to Frank the eight fungi 

 enumerated below, which are much alike externally, 

 contribute to the cause of this disease : sometimes 

 singly, sometimes several of them being concerned. 



(i) Septoria graniijieum, Desm. 



(2) Septo7'ia briosiana, Morini. 



(3) Septoria ghunaruni^ Pass. 



(4) Septoria avencB, Frank. 



(5) Ascochyta graminicola, Sacc. 



(6) Phoma Heiniebei^gii, Kiihn. 



(7) Leptosphceria Tritici, Pass. 



(8) SphcB7^ella exitialis, Morini. 



Some of the above fungi may also be concerned 

 in the blackening of the grain. 



Little can be done in the way of prevention. 



[b) Leaf Brown of Barley [Hchninikosporin?n 

 gram inemn , Erik.). 



This disease is very prevalent on the leaves of 

 barley on the Continent, and many crops in England 

 suffer from the same cause. Potter has shown 

 that it is the cause of " deaf ears" in barley. 

 -Symptoms. — Elongated, dark, brownish-olive 

 patches with yellowish circumferences appear on the 

 leaf while it is still green ; these spread, especially 

 lengthwise, destroying the tissues until the whole 

 leaf becomes discoloured, dried, and split up into 

 ribbons. The under leaves are attacked first, and 



