Aphids Injurious to Orchard Fruits, Etc. 27 
may be produced in a day and considerably over 100 as the total 
for a given parent. In spring large numbers of winged forms (fig. 
20) appear and the percentage of these gradually increases until all 
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TI Aine Cir). 
. el ral rofits pip 
a [I 25 5 
ar aT OR (exis Ox ots ~_ se poet rerieet as LEE AL Ge 
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Fic. 20.—The black peach aphis: Above, winged form, much enlarged; below, antenna of winged form, 
more enlarged. 
of the forms above ground have become winged. These fly to some 
plant or plants not known and are not met on peach foliage until 
the next year. 
