86 Farmers’ Bulletin 1169. 
have the characteristic appearance of aphids, the winged ones being 
reddish brown with a pale green abdomen, and there are a few pale 
reddish individuals scattered among them. 
Remedy.—Forty per cent nicotine sulphate (p. 13) applied /as 
soon as the insects are observed will control them. 
WOOLLY MAPLE AND ALDER APHIS.” 
How injurious.—While this insect can not be considered a serious 
enemy of the maple, which is the more important of its two hosts, 
owners of infested trees are greatly distressed by the masses of white 
cottony fluff they find covering the 
leaves of their favorite shade tree in 
the spring, and are insistent on 
knowing the nature of it and the 
remedy. 
How recognized.—The abundant, 
bluish white, cottony fluff on the 
underside of folded-over maple 
leaves (fig. 60), in the midst of 
which, from spring to midsummer, 
winged or wingless (immature) in- 
sects are found, is an indication of 
the presence of this aphis. 
Habits—The aphids in the white 
woolly masses which appear on the 
young maple leaves early in the 
spring come from eggs that were 
laid the previous fall in cracks and 
under loose bark on the trunk of the 
Fic, 60,—Colony of woolly maple and tree. As they reach maturity and ac- 
alder Se VOUS of maple quire wings they migrate to alder, 
which may be quite a distance away. 
This may last until midsummer, when all have abandoned the maple. 
On the alder the migrants settle on the underside of leaves and pro- 
duce living young, which move over-to the bark of twigs, branches, ox 
stems, and settle, feed, and grow there, several generations succeeding 
one another. Some of the last generation here produced fly back to 
the maple in the fall, there producing a generation of males and 
females, the latter laying the eggs with which the cycle was started. 
Those on the alder that did not migrate in the fall craw] down to the 
ground, hiding for the winter on the roots and in the leaves and 
débris at the bottom of the plant, and not coming out until the sap 
rises the following spring, whereupon they resume the usual activities 
of feeding and reproduction. 
ESN 
ae. 
= 
\ 
\ 
% Prociphilus tessellatus Fitch. 
