Green Dock Beetle (Gastrophysa viridula)

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Green Dock Beetle (Gastrophysa viridula)

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Green Dock Beetle (Gastrophysa viridula)

The green dock beetle’s breeding season is from March to October. There are 2 to 4 broods per year, with the last brood hibernating as an adult. The female lays over 1,000 eggs, laying them in clusters of 20 to 45 on the underside of the food plant’s leaves. The eggs are oval in shape, and are cream to yellow, turning orange prior to hatching. After about 3 to 6 days, the larva hatches from the egg. It varies in colour from greenish grey to dark brown. Its body is segmented, and will reach a length of 8 mm. Young larvae will drop to the ground if disturbed while feeding, while older larvae secrete a substance which repels competitors from eating the food plant leaves. After three instars, the larva pupates in a burrow about 2 cm underground. The adult emerges 6 to 9 days later.

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