Biology Reference
In-Depth Information
TAXUS
Phyllocoptes goniothorax sorbeus
See under Crataegus , p. 411.
Cecidophyopsis psilaspis (Nalepa) ( 1115-1116 )
Yew gall mite
A widely distributed and generally common pest of yew
( Taxus ); particularly abundant on nursery stock and on
regularly clipped bushes or hedges that produce an
abundance of new growth. The mites breed throughout
the year, and appear in large numbers in the spring.
They then invade terminal and lateral buds on the young
shoots. Infested buds fail to open, and instead expand
into bloated mite-laden galls ('big buds'). Attacked
buds and surrounding tissues also become blackened.
Although damage on mature hosts is of little or no
consequence, infestations on young plants are very
disfiguring (often reminiscent of herbicide damage).
The causal mites ( c . 0.16 mm long) are whitish, with
about 75 abdominal tergites and sternites; they lack
setae on the prodorsal shield.
SYRINGA
Eriophyes löwi Nalepa ( 1114 )
Lilac bud mite
A widely distributed pest of lilac ( Syringa ). The mites
infest the buds, causing desiccation and a proliferation
of dwarfed lateral shoots. Expanded leaves are also
invaded, and affected foliage becomes discoloured and
the leaf margins distorted. The mites are c. 0.17 mm
long, with about 60 tergites and sternites. Infestations
also occur on privet ( Ligustrum vulgare ).
1114
TILIA
Aceria exilis (Nalepa)
syn. Eriophyes tiliae exilis Nalepa
Leaf galls formed by this mite at the junction of two
major veins may be found on lime ( Tilia ) from May or
June onwards. The galls develop on the upper surface of
the leaf as small, hairy, greenish-yellow to brownish
pimples, the position of each being marked below by
pale brownish hairs; such hairs also line the inner
surface of the galls. The mites are similar in appearance
to Eriophyes tiliae
(q.v.). but have fewer ( c . 60)
abdominal tergites.
1114 Lilac bud mite ( Eriophyes löwi ) damage to leaves of
Syringa .
1115
1116
1115 Gall of yew gall mite ( Cecidophyopsis psilaspis ).
1116 Yew gall mite ( Cecidophyopsis psilaspis ) damage to
young shoot of Taxus .
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