Agriculture Reference
In-Depth Information
(b)
(a)
Figure 18.11
(a) Peach-potato aphid; (b) poached-
egg plant, pollen source for hoverfl ies; (c) hoverfl y on
Nepeta
sp.
(c)
Autumn and winter PEACH host
Wingless parthenogenic
female
September-
March
Eggs
March-May
Females
fertilized
Nymph
Nymph
Winged parthenogenic
female
September
June -
September
Winged parthenogenic
female
Winged
sexual
female
June
Spring PEACH
host
Summer host
e.g. POTATO,
LETTUCE
September
June-September
Nymph
Figure 18.12
Peach-potato aphid life cycle. Female aphids produce nymphs on both the peach and the summer
host. Males are produced only in autumn. Eggs survive the winter. In greenhouses, the pest may remain active
throughout the year
