120 FRUIT CULTURE. 



male deposits her eggs on the bark, and when 

 hatched the young larva bores through the bark 

 and lives upon the wood sap underneath. It 

 closely resembles the flat-headed apple borer 

 and may be destroyed in the same way. 



The Cherry Bark Louse (^Lecanium cerasifex). 

 The scales of this insect may be found in the 

 spring adhering to the under side of the limbs 

 of cherry trees. These cover a mass of minute 

 eggs. As soon as hatched the young larvae 

 spread over the bark of the young growth and 

 subsist upon the juices of the twig. The scales 

 may be removed by scrubbing with alkaline wash, 

 and the larva be destroyed by tobacco water. 



The Cherry Plant Louse (^Mysus cerasi). 

 This black louse is hatched early in the spring, 

 from eggs deposited in the fissures and at the 

 base of buds in the previous autumn. They 

 come in such numbers as to cover and crowd the 

 young foliage and stunt the growth by sucking 

 the juices. In a few days they multiply so 

 enormously as to make the twigs black with the 

 mass, and to attract other insects to prey upon 

 and destroy vast multitudes of them. Later in 

 the season a second crop appears upon the ten- 

 der leaves at the ends of the shoots. When the 

 trees are small the twigs may be dipped in a pan 

 of strong tobacco water or soap-suds. On large 



