Two Gemmed Sawfly 2014

Two-gemmed Sawfly, Huckleberry Lake, Emigrant Wilderness 2014

Tenthredo bigemina (Tenthredinidae)

Sawflies get their name from the saw-like nature of their ovipositor. Sawfly larvae usually feed on the outside of plants, many prefer grasses, but some do serious damage in the timber industry as woodborers and leaf miners.

Sawflies are herbivores, feeding on plants that have a high concentration of chemical defences. These insects are either resistant to the chemical substances, or they avoid areas of the plant that have high concentrations of chemicals.[3] The larvae primarily feed in groups; they are folivores, consuming plants and fruits on native trees and shrubs, though some are parasitic. However, this is not always the case; Monterey pine sawfly (Itycorsia) larvae are solitary web-spinners that feed on Monterey pine trees inside a silken web. The adults feed on pollen and nectar. &

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