78 FRUIT TREES AND THEIR ENEMIES 



holes in them. The fungus also attacks the young 

 shoots. 



Remedies. — The same as for scab (p. 74). All 

 fruits remaining on the trees should be removed 

 and destroyed, they are always the most dangerous 

 carriers of disease germs of all kinds. 



Cherries 



Cherry Aphis {Myz2is cerasi). — This aphis is black, 

 and may be found attacking the foliage at any time 

 between the spring and autumn. 



Remedies. — The same as for apple aphis. The aphis 

 leaves much sticky excretion on the leaves, and an 

 emulsion made with soap {i6d) is, perhaps, more 

 suitable for removing this than one made with metallic 

 sulphates. Soap and quassia, and also nicotine solu- 

 tion (26), are very effective. 



Cherry and Pear Sawfly. Shigivorni. {Eriocampa 

 limacind). — The larva is black and slimy, resembling 

 a small slug, nearly half-an-inch long ; it feeds on the 

 upper sides of the leaves, converting the leaf into a 

 skeleton. When full grown, it casts its coat, and 

 appears as a buff-coloured, dry larva, which goes 

 down to the ground, and spins a cocoon covered with 

 earth, from which the sawfly emerges the following 

 summer, and lays its eggs in the under surface of the 

 leaves. 



Remedies. — Spray with arsenate when the slug- 

 worms appear, which they do at very various dates. 

 Two or three successive dustings with lime have also 



