Upright webspinning sawfly
Alberta, British Columbia
Damage, symptoms and biologyAcantholyda verticalis is a relatively uncommon innocuous solitary defoliator.
Mature larva up to 18 mm long. Head, light tan with a pair of seven segmented antennae and rows of brown spots in two patches over the crown. Body, yellowish green with prominent purplish brown middorsal, midventral and spiracular stripes; yellow subspiracular stripes. A pair of jointed appendages occur at the posterior end.
This species overwinters as a prepupal larva in earthen cells. Adults emerge in spring or early summer. Larvae construct silken webs and are active from June to July. Mature larvae drop to the soil in late July to August and construct earthen cells.
Canadian Forest Service Publications
Diet and feeding behaviour
: Feeds on the leaves of plants.
- Webworm: Spins a silk shelter in which to hide or feed.
Information on host(s)
The principal host of Acantholyda verticalis are lodgepole pine and ponderosa pine; other hosts include western white pine and Monterey pine.
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