New York Agricultural Experiment Station. 447 



were very badly infested, a majority of them being seriously in- 

 jured. We have found it upon apple, pear, crab apple and quince. 

 In addition to these food plants Dr. Howard* gives black cherry, 

 choke cherry, currant, mountain ash, Japan qi3ince and peach, 

 the last named having been sent from two localit:es in Georgia. 



Descriptions and life history. — The general appearance of the 

 mature female scales is shown in Plate XIX, Fig. 4, which is from 

 a photograph of an infested pear twig. They are dirty white in 

 color. The life history of this species is very similar to that of 

 the oyster-shell bark-louse. The eggs are found under the scales 

 during the winter, but usually in less numibers than in the pre- 

 ceding species; also, instead of being cream white, they are pur- 

 plish red. The young scales hatch in the spring at aibout the 

 time the young oyster-shell bark-lice appear, which they resemble 

 very closely. The male scales are much smaller than the female 

 scales, and, unlike them, are brilliant white. They are also quite 

 different in shape, the sides being nearly parallel with two longi- 

 tudinal ridges extending along the upper surface. 



Means of distribution. — This insect is distributed by means of 

 infested nursery stock in the same manner as the preceding 

 species. Owing to their lighter color, however, they are more 

 easily seen, and hence there is less excuse for sending out infested 

 stock. 



Remedial measures. — The treatment recommended for the 

 oyster-shell bark-louse will prove equally effective for this insect. 



The New York Plum Lecanium. 

 Lecanium cerasifex tFitch(?). 



The sudden appearance of this insect three years ago in over- 

 whelming numbers in some of the large plum orchards of west- 

 ern New York is, doubtless, fresh in the memory of orchard- 

 ists and nurserymen throughout the State. Very little is heard 

 of this scale now, however, owing to the fact thai it disappeared 

 almost as suddenly as it came. But it may still be seen occasion- 



*Year Book U. S. Dept. Agr. 1S94, p. 260. 

 Identified by Mr. Th. Pergande. 



