Hoplocampa testudinea

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apple infested by Hoplocampa testudinea larva (click on image to enlarge it)
Author: Eugène Vandebeulque
Source: Insect Gallery
Hoplocampa testudinea adult (click on image to enlarge it)
Author: Charles Vincent, Agriculture and Agri-Food Canada
Source: Agriculture and Agri-Food Canada

Hoplocampa testudinea (Klug, 1816) - (apple sawfly)

The sawfly attacks and destroys fruits of apple trees. The insect is native to Europe but was accidentally introduced into North America (first record in 1939).

The adult is 7-8 mm long. The female lays eggs into the apple flower. The first and 2nd instar larvae tunnel under the skin of young apple fruits causing characteristic feeding damage and deformations. Older larvae move to a new fruit and bore into the core. The mature larvae drop to the ground, overwinter in the soil and pupate in the spring.

A single larva can damage several fruits and these are often aborted. In eastern Canada the apple sawfly causes about 4% yield loss if not controlled. Management involves monitoring and the application of chemical or botanical insecticides, targeting usually the young larvae. However, control is only possible for about 1 month per year.

Vernacular names
• Deutsch: Apfelsägewespe
• English: apple sawfly
European apple sawfly
• Español: hoplocampa del manzano
• Français: hoplocampe du pommier

For a review see Vincent et al. (2019)