APRICOT AND CHERRY PESTS. 



89 



and is usually met with in May or June. The female, 

 armed with a saw-like apparatus, makes an oval slit in 

 the under side of the leaf, and deposits an egg within 

 From half a dozen to a score of eggs may be deposited in 

 each leaf. In seven to twelve days each egg gives birth 

 to a small white larva, which eventually becomes green, 



[Photo: J. G. Blak€y. 

 CBER.RY BLACK FLY (MYZUS CERASI). 

 An aphis which frequently does serious injury to cherries. 



and afterwards covered with a dark slime. It then 

 assumes a slugdike form, being large at the head and 

 tapering at the tail. There are seven pairs of feet attached 

 to its abdomen, three pairs to its thorax, and a pair of 

 short sucker feet to its tail. It is very sluggish in its 

 movements, and feeds on the soft tissues of the upper 

 surface of the leaf, leaving the network of nerves and ribs 

 below. At the end of a month it loses its slug-like form 

 and slime, and changes to an orange-yellow colour. Dur- 



