Agriculture Reference
In-Depth Information
Fig.
77 A weevil larva - family Curculionidae (xl5).
EXAMPLES:
Apoderinae -
Apoderus coryli
(hazel leaf roller weevil): Rhynchitinae -
Rhynchites aequatus
(apple fruit rhynchites).
23. Family APIONIDAE
(p. 151
et seq.)
Minute to small, more or less pear-shaped wee-
vils; antennae not geniculate, the scape elon-
gated but only slightly longer than segments two
plus three. Larvae often feed concealed within
flower heads or seed capsules.
EXAMPLES:
Apion apricans
and
A. assimile
(clover seed weevils).
Fig.
78 Antennae of various weevils: (a) family
Atellabidae: (b) family Curculionidae; (c) family
Scolytidae.
24. Family CURCULIONIDAE (weevils)
(p. 153
et seq.)
25. Family SCOLYTIDAE (bark beetles)
The main family of weevils; adults with geni-
culate antennae and a very long scape
(Fig. 78b):
rostrum variable in form, sometimes exceed-
ingly long; body often clothed in scale-like
hairs.
EXAMPLES:
Anthonominae -
Anthonomus
pomorum
(apple blossom weevil); Brachyd-
erinae -
Philopedon plagiatus
(sand
weevil); Ceuthorhynchinae -
Ceutorhynchus
assimilis
(cabbage seed weevil); Otior-
hynchinae -
Otiorhynchus sulcatus
(vine wee-
vil),
Phyllobius pyri
(common leaf weevil);
Sitoninae -
Sitona lineatus
(pea & bean
weevil).
Typically small, dull-coloured, cylindrical,
wood-boring beetles
(Fig.
79); antennae short
but with a distinct scape and large, flattened
apical club
(Fig. 78c);
elytra often concave
posteriorly. Larvae apodous, with an enlarged
thoracic region. Development occurs entirely
within host plants in distinctive galleries, larvae
of some species feeding on wood pulp and others
upon ambrosia fungi that grow within the brood
chambers.
EXAMPLES:
Ipinae -
Xyleborus
spp. (ambrosia
beetles); Scolytinae -
Scolytus mail
(large fruit
bark beetle).
