122 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
Figure 21.—Aphrophora parallela: A, Adult; B, masses of spittle produced by 
nymphs on Scotch pine. (Courtesy Conn. Agr. Expt. Sta.) A, About 15 times 
natural size. 
Although most injurious to Scotch pine, it also attacks pitch pine, east- 
ern white pine, jack pine, Virginia pine, red pine, Japanese red pine, 
and Norway spruce. Brown © reported that in Canada in 1939 the 
insect was most commonly found on white pine. Adults are about 10 
mm. long, light brown on top, and dotted with pale and dark spots, 
which appear as obscure transverse bands. 
The eges are deposited at the bases of the terminal buds of the host 
tree in July and August. They hatch the following spring, usually in 
May, and the young nymphs at once begin feeding on the twigs. The 
nymphs soon become covered with the spittle. During development 
they may move to new locations on the twigs and form new masses of 
froth. By the time they are full grown in July, they will have mi- 
erated to the main trunk of the tree, where a large number may occupy 
the same spittle mass. When ready to transform to adults, the nymphs 
leave the masses of froth, migrate to the needles of the tree, and shed 
the last nymphal skin, emerging as winged adults. The adults con- 
tinue to feed during July and August, but produce no froth masses 
(Henry, 220). 
In a heavy infestation of Aphrophora parallela there is a constant 
drip from the frothy masses, and also a flow of the liquid along the 
twigs and branches. The adult insects eject undigested sap in the form 
of a fine mist, which continually drops from heavily infested trees 
™ Brown, A. W. A. ANNUAL REPORT OF THE FOREST INSECT SURVEY 1939. Canada 
Dept. Agr. Ann. Rpt. Forest Insects Survey 1989, 37 pp. 1940. [Processed. ] 
