THE WOOLLY LOUSE. 



37 



time. It lays its eggs, not only upon the trunk, but sometimes 

 on the main branches. 



The flat-headed larvse, Fig. 32, , works, for a time, in the sap- 

 wood, then makes an upward burrow, and, turning, comes out in 

 another place, just under the bark, 

 where it undergoes its changes. Fig. 

 32, 6, shows it in the chrysalis state: 

 Fig. 32, d, is the perfect beetle; Fig. 

 32, c, the head of the borer, en- 

 larged. It is uncertain whether the 

 Flat-headed Apple-borer completes 

 its growth and transformation in one 

 or two years. 



Remedy. Its presence may be 

 known in the tree in the same way 

 as the Round-headed Apple Tree 

 Borer, and the same remedy must 

 be applied. 



The use of washes upon the trunk 

 to prevent insects from depositing 

 their eggs is of uncertain value. 

 Perhaps the best of these is a solu- 

 tion of soft soap in wh'.ch has been 



mixed ,a teaspoonful of crude petroleum to the gallon or a 

 t'lblespoonful of carbolic acid or coal tar. 



THE WOOLLY LOUSE, OR APHIS (Schizoneura lanigem). Al- 

 though commonly known as the root louse, and more generally 

 found upon the roots of the Apple, it often causes much injury to 

 the branches. It is a small insect (Fig. 33), about one-sixteenth 



Fig. 32, a, 6, c. d. 



to one-eighth of an inch long, and more or less covered with a 

 cottony or nearly white substance, whence comes its commojt 

 name. It attacks the branches in patches, sucking their juices, 

 and causing black, canker-like places, which spread, often destroy- 

 ing the limbs. 



