no MAIXE AGRICULTURAL EXPERIMENT STATION. 



orchard on the trees. It is very active and hard to catch, quickly- 

 taking wing. It lays, probably, about one hundred eggs. 



The female fastens her eggs, singly or in groups, to loose 

 flakes of bark, or in the crevices, by means of a glutinous sub- 

 stance. The eggs soon hatch and the young Iztyx. gnaw through 

 the bark and live on the sap wood, making flat channels next to 

 the bark, sometimes girdling the trees. As they get older they 

 bore upward into the solid wood and, when ready to change to 

 the chr\-salis, gnaw to the bark and nearly through it. They 

 then change to the chrysalis, and in about three weeks the beetles 

 come forth. The larv^se attack the trunk and larger branches and 

 remain in the tree but one 3-ear. 



Vulnerable Points and Remedies. 



Same as for the round-headed borer. 



THE OYSTER-SHELL BARK LOUSE. MytHaspis pomoruni, Bouche. 



The oyster-shell bark louse is a native of Europe and was 

 introduced into this country, on nursery stock, about a hundred 

 years ago. it is widely distributed, and is exceedingly common 

 in Maine. The twigs of apple trees are often literally covered 

 with the scales, causing great injury. Besides doing great 

 aamage to apple trees, this scale is found on the pear, plum, cul- 

 tivated and wild currant, roundwood, dog wood, and several 

 other shrubs and trees. 



Description. 



Eggs. — ^^Vhite, changing to 3-ellowish or reddish with age, oblong, about 

 .01 inch long; from 20 to 100 under each scale. 



Young females. — Wingless, white and about .01 inch in length, move 

 about quickl3', appearing on the branches as small white specks which 

 finally attach themselves, by their beaks, to the new shoots, where the 

 scale is perfected. 



Scale of female. — Wingless, about .08 of an inch long, narrow, widened 

 at the posterior end, curved and shaped somewhat like an oyster shell. 

 Brown or grajash, closely resembling the bark in color. Most frequently 

 placed with the small end toward the tip of the twig. 



Scale of male. — Much smaller than the female, wedge shaped and 

 straight; usuallj' placed on the leaves and rarely seen. The male insect 

 undergoes a complete metamorphosis, and in the perfect form is pro- 

 vided with two wings. 



