Agriculture Reference
In-Depth Information
Fig. 223
Larva of cabbage stem flea beetle,
Psylliodes chrysocephala:
(a) head and thorax (xlO).
Fig. 222
Cabbage stem flea beetle,
Psylliodes
chrysocephala
(xl2).
attacks are rarely important and usually of most
significance in nursery beds. Adults hibernate
throughout the winter. They emerge in the
spring and eventually deposit eggs in the soil
around the base of host plants. The larvae are up
to 6 mm long and mainly whitish, with a reddish-
brown head, prothoracic plate and anal plate.
They feed on the roots for about a month and
then pupate. New adults occur from late July
or early August to October or November. The
adults are 2-3 mm long and black with a bronzy
or greenish sheen. Before hibernating, they
graze on the foliage and will sometimes also
attack the young, ripening cones, within which
they often shelter during inclement weather.
in the early summer. There is just one generation
annually.
DESCRIPTION
Adult
4-5 mm long, metallic bluish-green to
metallic greenish-black, but sometimes bronzy
(Fig. 222);
antennae
10-segmented (see Fig.
220b) (cf.
Phyllotreta
spp., Fig. 220a).
Egg
0.5 mm long, elongate-oval, yellowish to
yellowish-orange.
Larva
up to 8 mm long;
body
whitish;
head, prothoracic plate, anal plate and
pinacula
black;
thoracic legs
well developed
(Fig.
223)
(cf. cabbage leaf miner,
Phytomyza rufipes,
p. 192; cabbage stem weevil,
Ceutorhynchus
pallidactylus,
p. 156;
Scaptomyza flava
p. 185).
Pupa
5 mm long, white.
Family ATTELABIDAE
(leaf-rolling weevils)
Rhynchites caemleus
(Degeer)
Apple twig cutter
Psylliodes attenuata
(Koch)
Hop flea beetle
This weevil is a locally common pest of apple;
infestations sometimes also occur on other fruit
trees. Adults cause damage, usually in June.
They sever the tips of young shoots which then
This uncommon pest is associated with hop. It
occasionally causes damage to young growth but
