Mites - Pests of Ornamental Trees, Shrubs and Flowers - page 399

1075

NOTE
The specific name ' cephaloneus ' (sometimes cited as
' macrorhynchus cephaloneus ') is often restricted to the
mites producing bead galls on maple; the name
' macrorhynchus ' (see below) (sometimes cited as
' macrorhynchus aceribus ') is then applied to the mites
on sycamore, without recognizing differences between
the two types of gall found on that host.

Artacris macrorhynchus (Nalepa) ( 1075 )
Sycamore leaf gall mite
Widespread and generally common, inducing the
development of elongate (2-4 mm long), dark red galls
on the upper surface of the leaves of sycamore ( Acer
pseudoplatanus ). The galls, which occur throughout the
spring and summer, are distinctly longer than those of
the previous species.

1075 Galls of sycamore leaf gall mite ( Artacris
macrorhynchus ) on Acer pseudoplatanus .

1076

Eriophyes eriobius Nalepa ( 1076 )
Infestations of this species induce the development of
erinea on the underside of the leaves of maple ( Acer ).
The galls commence as whitish patches which later
become flushed with purple. The upper surface of
affected leaves is slightly discoloured but damage
caused is unimportant. The causal mites ( c . 0.2 mm
long) are pale yellowish, with about 68 abdominal
tergites and sternites.

Eriophyes eriobius pseudoplatani Nalepa ( 1077 )
This subspecies is associated with sycamore ( Acer
pseudoplatanus ), inhabiting yellowish to brownish
erinea on the underside of the leaves. The galls occur
from May onwards, and tend to be concentrated
alongside and at the junctions of the major veins
(cf. galls formed by Eriophyes psilomerus ). Although
infested leaves are often extensively galled, the foliage
is not distorted.

1076 Galls of Eriophyes eriobius on underside of leaf of Acer
campestre .

1077

1077 Galls of Eriophyes eriobius pseudoplatani on underside
of leaf of Acer pseudoplatanus .