Diplolepis mayri (Schlechtendal, 1877)

Nomenclature: Rhodites mayri Schlechtendal, 1877

Feeds on: Induces galls on Rosa rubiginosa L.

Distribution: United States: New Jersey

Diplolepis mayri

Rose
Stem swellings
A specimen reared from a gall on a rose in a nursery in NJ was determined as this European species. Similar adults have been reared from a lobed terminal stem gall on Rosa rubiginosa in Ohio, the adults emerging May 12-18.

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A single female determined as this European species was reared in May from a rose of European origin in nursery in New Jersey. Others from galls on Rosa rubiginosa at Dayton OH were reared May 12, 13, 15, 18.

Diplolepis mayri

Galls are globular shaped and multichambered with numerous protuberances and average 2.0 cm in diameter. Some smaller, singlechambered galls are spherical and form on the surface of leaflets while larger, heavier galls cause the host leaf to droop. Immature to maturing galls are dark
green and when they dry at the end of the season they are tan-gray. The surface of mature
galls are either smooth or clothed with fine prickles.