Biology Reference
In-Depth Information
28
Eurhadina pulchella
(Fallén) (
28
)
Although associated mainly with oak (
Quercus
), this
species also attacks the foliage of other trees, including
birch (
Betula
). It is widely distributed and generally
common in Europe. Adults (
c
. 4 mm long) are variable
in colour, but the elytra are usually yellow with a distinct
apical patch. In common with other members of the
genus, individuals have a characteristically flattened
appearance, the elytra being noticeably broader medially
and the head distinctly narrower than the pronotum.
Fagocyba cruenta
(Herrich-Schaeffer) (
29
)
syn.
Typhlocyba douglasi
(Edwards)
Beech leafhopper
Generally distributed and often abundant on beech (
Fagus
sylvatica
). Hedges and specimen trees are often
disfigured, the foliage becoming extensively flecked with
silver. The pest also invades other trees, including oak
(
Quercus
), sycamore (
Acer pseudoplatanus
) and
whitebeam (
Sorbus aria
). Adults (3.4-4.1 mm long) are
usually pale yellowish, with the elytra somewhat
darkened towards the inner margin; darker forms also
occur.
28
Adult of
Eurhadina pulchella
.
29
Graphocephala fennahi
Young (
30
)
syn.
G. coccinea
(Förster)
Rhododendron hopper
Widely distributed on
Rhododendron
in England,
particularly in the south, having been introduced from
America in the 1930s; also now widely distributed in
mainland Europe.
29
Beech leafhopper (
Fagocyba cruenta
).
DESCRIPTION
Adult:
8.4-9.4 mm long; head yellow; thorax bluish
green, marked with red and yellow; abdomen red above;
elytra bluish green, striped with red; hind wings grey.
Nymph:
whitish to yellowish green.
30
LIFE HISTORY
Eggs are inserted into slits made in scales on the flower
buds from August to October. The eggs hatch in the
following spring. Nymphs then feed on the underside of
leaves from April or May to July or August. Adults and
nymphs often occur in considerable numbers on the tips
of young shoots. There is just one generation each year.
DAMAGE
Direct feeding has little adverse effect on host plants.
However, infested plants are more susceptible to bud
blast (a disease caused by the fungus
Pycnostysanus
azaleae
), the fungal spores probably gaining easy entry
into plant tissue through hopper egg-laying slits.
30
Rhododendron hopper (
Graphocephala fennahi
).
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