PLANT-LICE INJURING LEAVES AND SHOOTS 315 



spraying with 'a contact insecticide, such as tobacco extract, to kill 

 the hibernating adults. To do this the bark should be scraped, and 

 the spray applied very early in the spring. A second method consists 

 in spraying with winter-strength lime sulphur to kill the eggs, ap- 

 plying the material when the buds are swelling. Finally, a contact 

 insecticide may be used to kill the nymphs, applying the spray when 

 the blossoms are falling. Any one of these treatments, thoroughly 

 applied, is effective. 



Plant Lice on Apple Foliage 



Three species of small, soft-bodied, sucking lice are commonly found 

 infesting the foliage of apples : the Apple Aphis {Aphis pomi DeG.) ; 

 the Rosy Apple Aphis 

 {Aphis sorbi Kahl.) ; and 

 the European Grain Apliis 

 {Siphocoryne avence Fab.). 

 In addition to these the 

 Clover Aphis {Aphis 

 hakeri Cowen) is some- 

 times found on apple late 

 in the fall and in the early 

 spring. 



Infestation may first be 

 observed on the j'oung 

 shoots which are found 

 completely covered with 

 very small, green or pink- 

 ish lice. About this time, 

 also, it maj' be noticed 

 that many of the lice are 

 clustering on the under 

 sides of leaves near the 

 ends of shoots, causing 



them tc curl. p^^ 484. — Work of the Apple Aphis on ter- 



Again the first evidence minal shoot. Original. 





