Cnephasia longana Haworth larva Omnivorous leaf tier

This locally common pest is polyphagous, but associated mainly with wild Asteraceae, including thistles. Crops attacked include apple, barley, bean, beet, linseed, maize, strawberry and wheat.

BIOLOGY

Moths are active in July and their eggs are then laid on tree trunks and other surfaces. The larvae overwinter in silken hibernacula, having fed only on their egg shells. In spring they invade various host plants and usually inhabit folded leaves or a shelter of webbed-down petals. They complete their development in June and then pupate in a silken cocoon on the host plant. Adults emerge 2-3 weeks later.

DESCRIPTION

Adult 15-22 mm wingspan; forewings whitish-ochreous to brownish-ochreous (in the female with darker markings) ; hindwings light grey. Larva up to 18 mm long; body greenish-grey to yellowish-grey, with pale stripes along the back; head light brown; prothoracic plate and anal plate light brown (Plate 12d). Pupa 7-8 mm long, light brown.

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