Agriculture Reference
In-Depth Information
Fig.
45 A scale insect,
Lepidosaphes ulmi -
family
Diaspididae: (a) adult female scale (xf 5); (b) ventral
view of adult female (x30).
24. Family COCCIDAE (soft scales)
(p. 123
et seq.)
Body of female cushion-shaped and protected by
an often tortoise-shaped, flexible or rigid, waxen
scale; legs present or absent. Development often
parthenogenetic. Male scales (if present) similar
in appearance to those of females but usually
smaller and narrower.
EXAMPLES:
COCCUS
hesperidum
(brown soft
scale),
Parthenolecanium corni
(brown scale),
Pulvinaria regalis
(horse-chestnut scale).
Fig.
43 Adult male of a scale insect,
Pulvinaria
ribesiae -
superfamily Coccoidea (x35).
25. Family PSEUDOCOCCIDAE
(mealybugs)
(p. 125
et seq.)
Small to medium-sized insects; males rare and in
many species unknown. Females elongate-
oval and superficially woodlouse-like, with
distinct body segmentation and relatively well-
developed legs, but with poorly developed an-
tennae; body more or less covered by a flocculent
or mealy, waxen secretion.
EXAMPLES:
Pseudococcus affinis
(glasshouse
mealybug),
Rhizoecus
falcifer
(root
Fig.
44 First-instar nymph of a scale insect,
Lepidosaphes ulmi -
superfamily Coccoidea (xlOO).
mealybug).
