Biology Reference
In-Depth Information
21
22
21
Rose leafhopper (
Edwardsiana rosae
).
22
Nymphs of rose leafhopper (
Edwardsiana rosae
).
Edwardsiana rosae
(Linnaeus) (
21-23
)
Rose leafhopper
A generally abundant and often important pest of rose
(
Rosa
); also harmful to various other rosaceous trees
and shrubs, including hawthorn (
Crataegus
), rowan
(
Sorbus aucuparia
) and whitebeam (
S. aria
). Widely
distributed in Europe; also present in North America.
Edwardsiana crataegi
(Douglas)
syn.
E. oxyacanthae
Ribaut; syn.
Typhlocyba
froggatti
(Baker)
This widely distributed species occurs commonly on
rosaceous trees and shrubs, and is sometimes damaging
to the foliage of crab-apple (
Malus
), flowering cherry
(
Prunus
), hawthorn (
Crataegus
), rowan (
Sorbus
aucuparia
) and willow-leaved pear (
Pyrus salicifolia
).
Adults are similar in appearance to those of
Edwardsiana rosae
but the elytra are darkened along the
inner margin of the clavus.
DESCRIPTION
Adult:
3.4-4.0 mm long; mainly pale yellowish, with a
yellow abdomen.
Nymph:
translucent to whitish.
Edwardsiana flavescens
(Fabricius) (
24
)
Foliage damage caused by this widely distributed
species occurs most frequently on beech (
Fagus
sylvatica
) and hornbeam (
Carpinus betulus
), the pale
yellow to whitish adults being readily distinguished
from the two most common and more strongly marked
species associated with these hosts (on beech,
Fagocyba
cruenta
, p. 34; on hornbeam,
Typhlocyba bifasciata
,
p. 36).
LIFE HISTORY
Eggs are deposited in the autumn under the epidermis of
young shoots of wild and cultivated rose bushes. The
eggs hatch in the following spring. Nymphs then feed
on the underside of the leaves, and reach adulthood in
late May or early June. Most adults then migrate to
summer hosts, such as fruit trees, but some remain on
rose and eventually deposit eggs in the leaves. These
eggs hatch in late June or early July and a second brood
of nymphs develops. Adults appear from mid-August
onwards. These, along with newly reared individuals
returning to rose from summer hosts, finally deposit the
winter eggs.
Edwardsiana nigriloba
(Edwards) (
25
)
Sycamore leafhopper
This widely distributed leafhopper, which is restricted
to sycamore (
Acer pseudoplatanus
), frequently causes
extensive damage to the foliage of ornamental trees.
Nymphs feed in the spring and early summer, and adults
appear in July. The adults (3.6-4.0 mm long) are mainly
pale yellowish (with a characteristic black tubercle
ventrally on the genital segment); the older nymphs are
particularly noticeable, having a characteristic black
pattern which contrasts with the pale background of the
underside of the leaves.
DAMAGE
Infested leaves become extensively flecked and
blanched. Infestations are most harmful in hot, dry
weather, and on climbing roses. Severe attacks may cause
leaves to turn brown, resulting in premature leaf fall.
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