Biology Reference
In-Depth Information
358
359
358
Nut leaf weevil (
Strophosoma melanogrammum
).
359
Larva of sallow leaf-mining weevil (
Tachyterges salicis
).
360
LIFE HISTORY
Adult females of this mainly parthenogenetic species
emerge from hibernation in the spring. They browse on
the leaves and attack the shoots of various trees and
shrubs, feeding throughout the spring and summer
months. Eggs are laid in the soil. Following egg hatch,
larvae feed on the roots of various herbaceous weeds.
They usually pupate in the late summer, and young
adults emerge shortly afterwards.
DAMAGE
Leaf damage is of no importance but shoots are often
ring-barked so that they wither and die. Infestations are
of particular significance on larch (
Larix
) seedlings.
Infestations in nurseries are also often of importance on
western hemlock (
Tsuga heterophylla
).
360
Sallow leaf-mining weevil (
Tachyterges salicis
) damage
to leaf of
Salix
.
361
Tachyterges salicis
(Linnaeus) (
359-361
)
syn.
Rhynchaenus salicis
(Linnaeus)
Sallow leaf-mining weevil
A generally common species, the bright yellow larvae
(up to 3 mm long) forming brown blotches in the leaves
of common sallow (
Salix atrocinerea
), grey willow
(
S. cinerea
) and other broad-leaved willows, and
sometimes causing noticeable distortion of the foliage
of nursery plants. Adults (2.0-2.5 mm long) are mainly
black, with a prominent white scutellum; the elytra are
patterned with white and may also be marked with
yellow anteriorly.
361
Sallow leaf-mining weevil (
Tachyterges salicis
).
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