18 



Provincial Board of Horticqlture. 



1897 





a \ 



^^f'^ 



(Fig. 3.) 



Young larvae and developing scale ; (a), ventral view of larva showing sucking beak with setse separated 

 with enlarged tarsal claw at right ; (6), dorsal view of same somewhat contracted, with the first 

 waxy filaments appearing ; (c), dorsal and lateral view of same still more contracted, illustrating 

 further development of wax secretion ; (d), later stage of same, dorsal and lateral views, showing 

 matting of wax secretions and first form of young scale — all greatly enlarged. 



(L. 0. Howavd and G. L. Marlatt, BvUetin No. 3, New Series, Division of Entomology , 

 U. 8. Department of Agriculture. ) 



" There are two points of interest" and importance to be noted in this life history. The 



first is, that the insect passes the winter beneath the scales in a partly grown condition 



Some Usually they are about lialf grown ; but some will be younger and some will 



Characteristics. ^ °^*^°''- '^^'^^ f^? *° continue reproduction until the tree is entirely 



dormant, and no further food is obtainable. On the other hand they do not 



seem to renew growth very early in spring, but are slow to begin reproduction ■ no larvae 



being noted until June. The second point is, that once they begin there is practically no 



period during the summer at which the young, active crawling lice are not to be found upon 



the tree. The length of time during which a given female will continue to reproduce has not 



been ascertained ; but it seems likely from what has been observed that breeding continues 



tor quite a long time, and that the female scales that have lived during the winte? may con 



tinue to live on and reproduce during the greatest portion of the summer, when their 



daughters and grand-daughters are already full grown, with nearly full grown progeny There 



may be, therefore, upon a plant at one time, young born of as many as three or even ''our 



distinct generations. * 



