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Saperda obliqua
Classification
Diagnostic Features of Larvae
- Larva. Form rather robust; integument very finely wrinkled, clothed with fine, whitish hairs; labrum subtrapezoidal, widest behind, clothed with very short dense hairs; pronotum wider than long, asperities extending over three-fourths the length; eusternum bearing a group of very long, slender hairs, asperities in two small groups of about ten each; sternellum bearing two small median groups of asperities; ampullae finely and sparsely asperate; pleural tubercles finely rugulose, broadly oval, bearing two long setae; spiracles narrowly oval, peritreme strongly chitinized. Pupa. Form as adult; stiff hairs on head about base of antennae and at inner margin of eyes, two longitudinal rows at base of clypeus, and several on tip of labrum; setiferous chitinous points distributed as in Saperda calcarata, but much smaller and setae slender; no armature on scutellum or metanotum. Adapted from Craighead (1923).
Biology and Economic Importance
- This larva has been found only in the base of Alnus, where it makes a large gall, often killing the bushes. Its work resembles that of the other gall-making forms. The larvae mine under the bark, later through the wood, and finally a straight upward burrow is made at the top of which pupation takes place. The adults are found throughout the central and eastern US during May and June. When found it is locally abundant. Adapted from Craighead (1923).
Selected References to Larvae Specimens
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