66 FRUIT TREES AND THEIR ENEMIES 



never in masses, as is the case with the Leaf-curHng 

 aphis. 



Treatjuefit. — The same as for the Leaf-curling aphis. 



The Blossom and Leaf Aphis [Aphis fitchii). — The 

 young hatch late in March, or early in April : the 

 aphis, which is green, feeds on the developing buds ; 

 later it attacks the blossom, but it does not cause 

 the leaves to curl. It migrates from the apple to 

 corn and grasses in early June, and, late in September, 

 or subsequently, it comes back to the apple, and lays 

 its eggs singly in crevices in the bark of the small 

 boughs and shoots. 



Treatment. — The same as for the other aphides, but 

 the spraying in April should be done about the middle 

 of the month. 



Codling Moth {Carpocapsa pomonella). — The larva 

 of this is the familiar " maggot " found in apples. 

 The moth is of a dull brown or grey colour, with a 

 metallic patch in the corner of each front wing, and 

 is four-fifths of an inch in spread. It first emerges 

 from the cocoon at the time of flowering, and lays its 

 eggs on the fruit as it sets, or at a later date. The 

 maggot, on hatching, enters the fruit at the eye, and 

 tunnels its way to the core, throwing out a small mass 

 of brown "frass" at the entrance-hole: later on it 

 forms a larger tunnel to the outside of the fruit. The 

 grubs, when full grown, crawl out, and let themselves 

 down to the ground by threads of silk ; a few may 

 crawl down the branches, and others fall with the 

 apples. Sometimes they spin their cocoons early, 



