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The grass eggar moth (Lasiocampa trifolii) is a hairy, reddish-brown or straw-yellow moth belonging to the family Lasiocampidae.
• Wingspan: Measures between 40 and 55 mm, with females notably larger than males.
• Markings: Features a curved cross-line on the forewings and a distinct central white spot.
• Subspecies: Includes the pale form known as the pale grass eggar (Lasiocampa trifolii subspecies flava) found in Kent.
• Caterpillars: Thickly haired, growing up to 65 mm, and display ruddy brown, yellow, or black segments.
• Locations: Found across Europe, inhabiting coastal dunes, maritime cliffs, and acid heaths.
• Food Plants: Caterpillars feed on grasses, heather, bramble, and willow.
• Flight Period: Adults fly primarily from August to September and are active at night, showing strong attraction to light.
• Overwintering: The species overwinters in the egg stage near the ground before hatching in spring.
• Pupation: Larve spin tough cocoons low to the ground amongst grass stems and leaf litter.
