Aphids Injurious to Orchard Fruits, Currant, Gooseberry and Grape Page: 26
42 p. : ill. ; 23 cm.View a full description of this pamphlet.
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FARMERS' BULLETIN 804.
SEASONAL HISTORY.
The eggs of this aphid are laid upon the peach twigs, and early in
the spring before the buds are opened the green stem-mothers are
hatched. From this form dur-
" ing the spring may be produced
: one or more generations of
wingless individuals upon the
leaves. Spring migrants, how-
ever, begin to occur very early
S. and continue to appear until
4"w rthe middle of June. These fly
, k rea" 7to a large number of different
plants, where numerous genera-
tions occur throughout the sum-
mer. During September and
October fall migrants are de-
veloped which return to the
S peach, where they deposit the
young egg-laying females.
These are fertilized by the
winged males, which also have
returned to the peach, and the
females then lay their eggs upon
the twigs. Occasionally, how-
ever, migrants are found which
do not return to the peach and
these deposit egg-laying females
upon the summer host plants.
THE BLACK PEACH APHIS.1
gy, The well-known black peach
:.A aphis is injurious to the twigs,
shoots, and roots. It is shiny
" i .dclark brown to black, with the
young an amber color.
The insect lives throughout
the year on the roots of the
peach and is most injurious to
peach growing on sandy soils.
FIG. 19.-The black peach aphis (Aphis pcr- It is prevalent in portions of
sicac-nitcr) : Colonies on peach shoot in Maryland and in Delaware,
carly spring. (Original.) New Jersey, and Michigan.
Individuals migrate from the roots during the warm periods in
winter or in early spring and start colonies on the twigs and young
shoots. (Fig. 19.) Often these become so numerous as to cause the
l.tphis pcrsicae-niger Smith.26
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Quaintance, A. L. (Altus Lacy), 1870-1958 & Baker, A. C. Aphids Injurious to Orchard Fruits, Currant, Gooseberry and Grape, pamphlet, 1917; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96449/m1/26/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.