298 OHIO EXPERIMENT STATION: BULLETIN 332 



First, this species is not as prevalent and, second, the leaves only 

 of the host are greatly affected while its near relative attacks the 

 more important twigs. Occasionally, however, it demands treal 

 ment. 



Food plants.- But two hosts, the soft maple (Acer sacchai 

 num) and the sugar maple (A. saccharum) are reported for thii 

 species. 



Distribution. Apparently this scale is a native America 

 species. It has been reported from Massachusetts, New York, 

 Jersey, District of Columbia, Tennessee, Ohio, Indiana, and som< 

 of the western states. 



Natural enemies.* The lady-beetle, Hyperaspis signata Oliv., 

 a small fly, Leucopis nigricornis Egger, and the following list oJ 

 hymenopterous parasites have been reported as destroying thij 

 pest : Aphycus Kederaceus Westw., Aphycus flavus How., Coccopl 

 gus fraternis How., Pachyneuron altiscuta How., and Chilonem 

 albicorms How. 



Control. The same control is recommended for this species 

 was given for the cottony maple scale. 



THE MAPLE PHENACOCCUS 

 (Phenacoccus acericola King) 



Description. Quite frequently the maple phenacoccus is mij 

 taken for the cottony maple-leaf scale, just described, since botl 

 appear upon the underside of maple leaves, but the two may 

 differentiated with ease, since the present species appears as 

 irregular cottony mass, about one-fourth of an inch in diameter, th< 

 cottony secretion completely covering the insect's body and egj 

 mass, while the cottony maple-leaf scale appears as a distinct flul 

 ovisac with the brown body of the insect attached at one end. Com- 

 pare Figures 3 and 5 of Plate LIL At certain seasons of the y( 

 the young, crawling females and the white cocoons of the males ma? 

 be found in great quantity upon the trunk of badly infested trees 

 (See Plate LII, Fig. 4.) 



Life history and habits. The partially-grown crawling scale 

 insects pass the winter within the shelter of crevices in the tree 

 trunk, emerging the following spring and migrating to the undersid( 

 of the leaves. They mature and deposit upon an average of aboul 

 500 eggs in the white, cottony egg-covering. These oggs hatch and 

 the cycle is repeated two or three times during the summer. 



Nature of work. In the writer's experience this insect hi 

 never been observed inflicting great harm in Ohio, though a 

 instances have come to his attention where individual trees w< 



