FESTS 79 



been found effectual. Spraying with weak emulsion 

 or tobacco (26) may be suggested. 



Cherry Leaf-scojxh {Gnonionia erythrostoind). — 

 Trees affected by this disease retain their leaves 

 till the following spring or summer, and these leaves 

 exhibit small black points on the under surface, 

 which are the heads of the spore-conceptacles of the 

 fungus. Each head contains many sacs, in each of 

 which there are eight spores. The spores are ejected 

 in the spring on to the young leaves, where they 

 germinate, and destroy the tissue by invading them 

 with their mycelium. The cells in the stalks of the 

 leaves, being thus injured, do not develop properly, 

 and hence the leaf is not shed in the usual way at the 

 end of the season. The fruit, also, is attacked, hard 

 cores form in the flesh, the fruits becoming distorted, 

 and falling prematurely. 



Remedies. — Remove and burn all dead leaves. 

 Spray with Bordeaux mixture (9^, gb, or 9c) before 

 the blossoms open, and again after the petals have 

 fallen. 



Currants 



Currant Aphides {^RJiopalosipJiniii ribis^ and Myziis 

 ribesicE). — Two aphides attack the currant — one (J/. 

 ribesice) makes the leaves crinkle up, and the other 

 {R. ribis) is found on those leaves which have red 

 blotches on them. These aphides attack the under- 

 neath surface of the leaf, and can, therefore, not be 

 reached easily by spraying, except before they curl 

 up or distort the leaves, etc. The eggs are found on 



