Some Insects of the ArrLE and Their Control, 1745 



THE apple aphides 



Plant lice are among the most harmful pests of the apple. 

 During recent 3^ears these insects have been very destructive in 

 many orchards in the leading apple-growing sections of N^ew York. 

 The species of apliids which occur on this fruit are the green 

 apple-aphis, the rosy apple-aphis, the European grain-aphis and 



Fig. 141. Aphides on Apple Leaf 



the woolly ajiple-aphis. The forms most injurious to the foliage 

 and fruit are the green apple-aphis and the rosy apple-aphis. The 

 presence of these species on trees is indicated by curled leaves and 

 the occurrence of a sweetish liquid called " honey dew," which 

 may be observed during the month of June upon the leaves and 

 fruits. The leaves later become blackened and unsightly owing 



