Agriculture Reference
In-Depth Information
Fig. 34
Nymph of a psyllid,
Psylla
sp. - family
Psyllidae (x25).
EXAMPLES:
Psylla mail
(apple sucker),
Psyllopsis fraxini
(ash leaf gall sucker).
Fig. 33 Outline and venation of forewing of a
psyllid: (a) family Psyllidae; (b) family Triozidae.
14. Family TRIOZIDAE
(p. 103)
Adult forewings angular apically, vein M + Cu
absent
(Fig. 33b).
Nymphs relatively narrow-
bodied; wing pads angular.
EXAMPLE:
Trioza apicalis
(carrot sucker).
Series STERNORRHYNCHA
(= PHYTOPHTHIRES)
Antennae long and thread-like, without a dis-
tinct arista (but apical segment often with a nar-
row terminal process); rostrum appearing to
arise from between the forelegs; tarsi 1- or 2-
segmented. Includes several groups of agricul-
tural or horticultural significance.
Superfamily ALEYRODOIDEA (whiteflies)
15. Family ALEYRODIDAE (whiteflies)
(p. 103
et seq.)
Small, moth-like insects more or less coated with
an opaque, white, waxy powder; antennae 7-
segmented; wings soft, rounded and with a re-
duced venation
(Fig.
35); tarsi 2-segmented.
Nymphs fiat and scale-like. Development in-
cludes a quiescent, scale-like, non-feeding
pseudo-pupal stage. The insects, especially
nymphs, excrete vast quantities of honeydew.
EXAMPLE:
Aleyrodes
Superfamily PSYLLOIDEA
(jumping plant-lice)
Very active, cicada-like bugs with the hindlegs
strongly developed and adapted for jumping;
front of head often with a pair of forwardly pro-
jecting genal cones; antennae 10-segmented;
hindwings small, thinner and more membranous
than forewings.
proletella
(cabbage
whitefiy).
13. Family PSYLLIDAE (psyllids)
(p.
101
et seq.)
Superfamily APHIDOIDEA
(aphids)
Insects with often complex life histories, the vari-
ous groups most readily distinguished by fea-
tures of the 1- to 6-segmented antennae, the
siphunculi and the cauda
(Fig.
36); tarsi 2-
Adult forewings rounded apically, vein M + Cu
present
(Fig. 33a).
Nymphs relatively broad-
bodied; wing pads rounded
(Fig. 34).
