Pristiphora

Latreille, 1810

Species Guides

13

Pristiphora is a of in the Tenthredinidae. within this genus are known for their larval feeding on leaves of various plants, with some species causing significant economic damage to trees and shrubs. The genus includes notable pests such as the larch sawfly (Pristiphora erichsonii), which defoliates tamarack and other larch species. are small, dark-colored -like insects with two pairs of wings.

Pristiphora abbreviata by (c) kitbeard, some rights reserved (CC BY), uploaded by kitbeard. Used under a CC-BY license.Pristiphora by (c) Line Sabroe, some rights reserved (CC BY). Used under a CC-BY license.Pristiphora rufipes by (c) bitsnbirds, some rights reserved (CC BY), uploaded by bitsnbirds. Used under a CC-BY license.

Pronunciation

How to pronounce Pristiphora: //ˌprɪs.tɪˈfɔː.rə//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

are small, dark-colored insects resembling tiny or flies. Key distinguishing features include two pairs of membranous wings (placing them in Hymenoptera rather than Diptera), and females possess a saw-like ovipositor used to cut plant tissue for insertion. Larvae are caterpillar-like with black and six or more pairs of (distinguishing them from lepidopteran caterpillars, which have five or fewer pairs).

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Habitat

Found in a variety of where plants occur, including forests, gardens, and landscapes. Specific habitat associations depend on host plant distribution.

Distribution

occur across the Northern Hemisphere. The columbine (Pristiphora rufipes) is non-native to North America, first detected in Canada in 1963, now ranging from the eastern seaboard to the Rocky Mountains. The larch sawfly (Pristiphora erichsonii) occurs in North America, Europe, and Asia.

Seasonality

Activity patterns vary by and latitude. In northern regions, some species produce one annually; in warmer areas, multiple generations may occur. The columbine in Maryland produces at least two generations, with activity beginning when new columbine foliage appears in spring.

Diet

Larvae feed on leaves of plants. Specific host associations include: larch (Larix) for P. erichsonii, columbine (Aquilegia) for P. rufipes. feed on nectar, pollen, and other small insects.

Host Associations

  • Larix laricina - tamarack/eastern larch; defoliated by P. erichsonii
  • Aquilegia - columbine; defoliated by P. rufipes

Life Cycle

Females use their saw-like ovipositor to cut slits in leaves or stems and insert . Larvae hatch and feed externally on leaf tissue. When mature, larvae drop to the soil and spin brown cocoons to pupate. Some have one per year in northern climates; others have two or more generations in warmer regions.

Behavior

are active fliers. Females exhibit precise -finding to locate suitable oviposition sites. Larvae feed gregariously and can completely defoliate host plants when are high.

Ecological Role

Larvae function as herbivores that can significantly reduce plant foliage. May serve as prey for birds and other . Some act as forest pests that influence tree health and forest composition.

Human Relevance

Several are economically significant pests. Pristiphora erichsonii (larch ) is a serious defoliator of tamarack and other larches, capable of causing extensive tree mortality. Pristiphora rufipes (columbine sawfly) damages ornamental columbines in gardens. Management includes hand-picking larvae, , and targeted applications.

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