Resseliella oculiperda Riibsaamen larva Red bud borer

This widely distributed but local midge is a potentially important pest of rose. The larvae cause damage to budded stocks and grafts; a similarly damaging 'strain' also occurs on fruit trees (Rosaceae), particularly apple. Affected buds or grafts may wilt and die; damage caused by late summer and autumn larvae tends to be most significant. The minute, c. 2 mm long, dark reddish-brown adults occur from May onwards, and there are typically three generations each year. Eggs are inserted in the slits in the bark of newly budded or grafted stock. They hatch in about a week. The larvae then feed in small groups for up to 3 weeks. Fully grown larvae, which are salmon-pink to reddish-orange and up to c. 3 mm long, drop to the ground to pupate in small cocoons spun in the soil. Adults emerge 2-3 weeks later. Larvae of the final generation complete their development in the autumn, overwinter in their cocoons and pupate in the spring.

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