REPORT OF STATE ENTOMOLOGIST. 



211 



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WOOLY APPLE APHIS. 

 Fig. iS. Schizoneuru lauigera: a, rpfiii'ic fm hIc- ;li, 1hi va ; c-,) u))h;iI 

 winged female. (Marlatt. liuUetin 34, Div. of Kntoniology 

 U. S. Uept. of Agri.) 



They are small, reddish-brown lice, and as generally seen, 

 are covered with a long white woolly substance. These appear 

 in patches on the limbs of the trees, often resembling mildew in 

 general appearance. They also live in colonies on the roots of 

 the same tree, where they form gall-like swellings of varying 

 sizes as shown in Fig. 19. They are much more destructive 

 when found on the roots as they sap the life of the tree directly 

 at its source. 



The insect passes the winter either in the egg-form in crevices 

 in the bark of the trunk, or in the adult stage in the gall-like 

 formations on the roots. 



In the spring the eggs hatch producing the agamic female 

 Fig. 18, a, and these give birth to living young as do those of 

 the San Jose scale. This continues through the summer when 

 the winged form appears, Fig. i8, d. These fly to other trees 

 and produce male and female lice ; the females of these lay- 

 eggs from which the new generation starts the following spring. 



The lice generally congregate around the scar produced by 

 the pruning of a limb or where an injury has occurred to the 

 bark. 



