THE FRUIT GROWER'S GUIDE. 



Brown Fly (Aphis persicoe) is first a pale brown, changing to a deeper and glossier 

 hue, sometimes almost black, and confines its attacks to the peach and nectarine, 

 infesting the leaves, points of the shoots, and young wood. It also attacks the leafless 

 young growths, and the flower-buds and blossoms. 



Blue Fly (Aphis pruni) is a light green colour, with a bluish metallic lustre, and 



Fig. 75. BIACE FLY (Arms CERASI). 

 Left-hand figure viviparous female, greatly magnified. Right-hand figure male aphis, much enlarged. 



surrounds itself with a sort of white meal, which renders its destruction more difficult. 



Plum, damson, and many other trees and plants are subject to its attacks. 



All the aphides survive 

 the winter under favouring 

 climatic conditions, vivi- 

 parous females existing on 

 the young wood of the 

 trees when grown under 

 glass. Eggs are deposited 

 in the autumn, generally at 

 the base of buds, where 

 they lie throughout the 

 winter. In the following 

 spring all the eggs produce 



Fig. 76. BLACK FLY (APHIS CEBASI) ON CHEEKY GROWTHS. females only vivipai'OUS 



this process continuing through several generations. Davau traced the reproduction 

 through eleven, and Kyber over a period of four years. On the approach of autumn, 

 winged males make their appearance, and fertile eggs are produced. These are buried in 

 the crevices of the bark, a spur or the indents about a bud being favourite places. The 



