There are hundreds of species of aphids. The few mentioned here
merely illustrate some of the different kinds and varying plant reactions.
BALSAM TWIG APHID
(Mindarus abietinus). Greenish lice, inside small,
round, white fluffs of wax, are common on young shoots of white
and balsam firs.
BEAN APHID (Aphis fabae).
This is a common, dull black species wintering
on euonymus and dock, summering not only on beans but on many
ornamentals, including dahlia, deutzia, English ivy, oleander, zinnia but
probably most hated on nasturtiums where it congregates in black masses
on underside of yellowing leaves. It is difficult to kill because it is hard
to reach all the lice; you have to have an angle nozzle on the spray rod.
BLACK CHERRY APHID (Myzus cerast)
, a large, metallic black species commonly curling and distorting leaves of sweet cherry. Elgetol or
other dinitro spray applied just before the buds break kills eggs wintering
on the bark. The aphids are so well protected by the leaves curling around
them it is hard to kill them with a summer contact spray.
CABBAGE APHID (Brevicoryne brassicae).
These nasty, powdery grayish-
green creatures are very common on most members of the cabbage
family, especially in late summer. If you don't look carefully and wash
thoroughly (try warm water with a little salt in it), you'll be eating them
along with your brussels sprouts and broccoli flowerets. Cabbage leaves
are often crinkled and curled into cups lined with vast numbers of aphids.
The turnip aphid is a closely related species found on the same plants.
Used early in the season and frequently enough to prevent a build-up,
rotenone dust is fairly satisfactory. Nicotine or TEPP sprays are more
CRAPEMYRTLE APHID (Myzocallis kahawaluokalani).
Confined to crape-
myrtle and found wherever this shrub is grown. It gets into action
as the new leaves unfold and covers them with honeydew, which is covered in turn with dense black sooty mold. Spray early and thoroughly
with any good contact insecticide.
CURRANT APHID (Capitophorus ribis)
, on currants and gooseberries. Pink,
yellow, or dark-green lice cause leaves to crinkle and hump up into
half galls, inside which the females are busily producing their living
young. The domed sections turn red, and leaves often drop. Glassy black
eggs are formed on the twigs. Spray with nicotine sulfate and soap,
changing to rotenone as fruit ripens; cover underside of foliage thoroughly.