Leptoglossus occidentalis (Coreidae)
the leaf-footed bug
||Observe features distinguishing this insect as a hemipteran,
i.e. basal part of wing thickened and leathery, distal part membranous. These
insects have piercing and sucking mouthparts. When insect is not feeding,
the feeding tube is carried between the base of the legs. Nymphs are smaller
editions of adults (gradual metamorphosis). Both adults and nymphs do damage.
Observe features distinguishing it as a leaf-footed bug, i.e. tibia of hind
legs enlarged and flattened to look like a little leaf. Adult is reddish
brown and up to 18 mm long. Adults overwinter in tree crevices to escape
the weather and emerge in May or June.
||No external damage is visible on the cones. Both adult and
nymph stages insert their long proboscises into cones to suck juices from
the seeds (bug remains on outside of cone). Heavy feeding can cause up to
41% loss of seed crop in Douglas-fir.
Significant losses in California: a major seed orchard pest in B.C.
References and Links:
EAG: 545-546, 548-549; FC: 84.