THE CHERRY] 379 



transparent. The flesh is rather soft, pale yellow, very 

 juicy and sugary. Matures late in June or in July. The 

 tree is middling in vigour and very productive. 



DISEASES. 



The diseases and pests of the cherry in these Islands 

 require further study. However the following are so far 

 known to be present. Pnccinia Cerasi Cast, the rust 

 of the cherry, which is met with sometimes on the haut- 

 bois and rarely on the cultivated cherries, is charac- 

 terised by the formation of small yellow pustules usually 

 on the under surface of the leaf. Phyltosficta prunicola 

 Sacc. causes the formation of numerous small round dry 

 spots on both surfaces of the leaf. Septoria Cerasi Pass, 

 produces roundish dark red spots on the leaves of the 

 hautbois and of the true cherries here as well as in 

 France, and Podosphaera tridaclyla DBy. is the cause of 

 the mildew, a rather rare disease in local orchards, but 

 common enough all over the continent 



In Italy, France and Germany the cherry is liable 

 to the following fungous parasites. Pkylfastitta Pruni- 

 avium Allesch. produces yellowish brown spots on the 

 upper surface of the leaf, surrounded by a red margin. 

 Gnomonia erythrostoma, Auersw. belonging to the order 

 Sphaeriaceae, causes yellow spots on the leaves, which 

 spread quickly and kill the leaf, and the leaf dries but 

 remains attached to the twig. This disease which also 

 attacks the fruit, interferes seriously with the production 

 and the development of the tree, and may cause its death 

 after repeated attacks. To Cercospora ceiasella Sacc. is 

 due the formation of round pale brown spots on the 

 leaves, and Septoria effusa Desm. found in Austria and 

 Italy, dots the leaves with spots of reddish colour. 

 Clasterosporium Amygdalearum Sacc. attacks also the 

 foliage of the cherry, producing roundish yellow spots 

 surrounded by a dark red margin; and large roundish 

 blotches at first greenish red and then brownish with a 



