390 



Insect Pests. 



The Chloritus and the TypUocyba had all the same effect ou 

 apple and plum leaves. 



On cobs and filberts the effect is not nearly so marked in this 

 respect, but when the young leaves are punctured the result is 

 equally striking, though very diverse they become pierced with 

 irregular slit-like holes (Fig. 260). This is caused by the young 

 tissue being damaged and splitting on further growth. The mottling 



'A. r. D. RintouL 



FIG. 2C0.-MT I.KAF I>AMAGE!> EY LFAF HOPPERS. 



and paleness of the foliage is the most marked feature of their attack, 

 however. 



The result of this damage is that the leaves lose their vitality 

 and cease to exercise their proper functions, fall prematurely, and in 

 bad cases of attack the fruit withers and drops. The growth of the 

 trees is also checked. 



The life-history of the TypMccylw: and Chhrita: is slightly 

 different. 



