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NEW JERSEY AGEICULTURAL COLLEGE 



needed. On lilacs, when it became troublesome, it was suggested that 

 the worst infested shoots be cut out, and more than that has not been 

 necessary. 



Complaint has been made at Hammonton for two years last past 

 that the city shade trees were badly infested by this insect, and that 



Fig. 8. 



The Oyster-shell Bark-louse, Mytilaspis pomorum Bouche : a, female 

 with the egg mass beneath the scale ; b same from above, showing 

 the normal appearance of the species ; c, a twig infested 

 by females ; d. the male scale, natural size and en- 

 larged. From Div. Ent., U. S Dept. Agric. 



maples in pai'lieular were actually dying under the attack. When 

 these complaints were renewed in the spring of 1905 I advised the 

 application of whale-oil soap, one pound in five gallons of water, when 

 the larva3 were active, and that active period began, as we observed from 

 specimens sent in, as early as May 15th, young scales being already 

 set May 26th. In mid- July specimens sent in contained what seemed 

 a mixture of partly grown and hibernating scales, but a second sample, 

 received a week later, proved that at Hammonton this insect is two- 

 brooded, and that larva; of the second brood begin to move during the 



