390 Insect Pests. 



The CMoritas and the Typhlocijlxt 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. B. Rintmd. 

 KIi;. iGO. — MT I.KAF HAMAGED BY LFAP HOPPEKS. 



and paleness f>f the Ibliage 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 Tijpliloculm and Chlorifa^ is slightly 

 different. 



