92 GARDEN FOES. 



among the cells and fcx'ding on the saji. In due course 

 yellow patches appear on the leaves, causing them to turn 

 brown, shrivel, and die. The fungus ceases development 

 at the en<l of the leaf, leaving the stalk free. Sometimes 

 the fruit also is attacked. The result is, the withered 

 leaves do not fall off in autumn, but remain on the tree 

 till the next season. Moreover, the natural functions of 

 the leaf being checked, the sap usually drawn up by them 

 to be elaborated and returned to make new wood and fruit 

 buds cannot be properly dealt with, and the result is 

 impoverished growth, a paucity of fruit buds, much dead 

 wood, and the final death of the tree. Mr. Salmon says 

 the disease is most persistent on trees grown in poor and 

 shallow soils. On deep and rich soils trees attacked have 

 grown out of the disease in time. The existence of the 

 disease is easily determined by the presence of withered 

 foliage on trees in winter and spring. 



Remedies. — Mr. Salmon says that if the withered leaves 

 are gathered in winter and burnt the winter fruit of the 

 fungus may thus be destroyed, and the spread of the 

 disease checked. Spraying the trees with Bordeaux Mix- 

 ture (Formula 20 or 21) just before the flowers open, and 

 again after the petals have fallen, is said to be a good pre- 

 ventive. 



Cherry Leaf Spot (Coryneum Boijerinckii). — This 

 disease attacks the leaves and young shoots in the form 

 of red spots on their under sides. Later the sjiots become 

 brown, the tissue dies and falls out, leaving holes in the 

 leaves. It also attacks the fruit, causing the flesh to 

 shrivel. 



Remedy. — S])ray with Bordeaux Mixture (Formula 20 or 

 21) when the buds are beginning to expand. 



Cherry Mildew (l^odosphjera tridactyla). — This forms 

 white patches on the leaves of young shoots, both sides 

 being attacked. When very severe, it seriously injures 

 the foliasfe. 



