INSECTS, FUNGI, PLANT DISEASES, ETC. 



14: 



The Oyster-Shell Bark Louse (Mytilaspis Pwnorum, 

 Bouche). — This is probably the commonest and most 

 widespread, and consequently the best known, of any of 

 the orchard scales. It is found all over the world. It is 

 found in the United States practically wherever apples 



Fig. 47 — Mytilaspis pomorum. a, Female scale from be- 

 low, showing eggs, b, Same from above, greatly en- 

 larged, e, Female scales, d, Male scale, enlarged. 

 e, Male scale on twig, natural size. Howard, Div. 

 Ent. TJ. S. Dept. Agri. 



and pears are grown. If, during the winter, one of the 

 female scales be lifted, it will be found to contain the 

 shriveled body of the dead female, under the anterior or 

 more pointed portion, while behind this the yellowish- 

 white eggs are thickly massed together back to the ex- 

 tremity of the scale. Under each scale the eggs number 

 from forty-two to eighty-six. The young hatch from thesp 



