Rhabdophaga tumidosae

Mayetiola tumidosae

Cecidomyiidae

Rabdophaga

Salix interior

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Plant Galls and Gall Makers

Key to American Insect Galls

Rabdophaga tumidosae

Phytophaga tumidosae

Subglobose galls, the surface scarred, diameter 4 mm

Phytophaga tumidosae

Salix [Salix exigua added as a placeholder]
Twig galls

Subglobose galls, the surface scarred, diameter 1/6 inch, midge, summer 

Phytophaga tumidosae

Host: Salix sp.

The galls were one-eighth to three-eighths of an inch long (Fig. 1) and were roughly spherical to oval in shape. The bark of a gall was scarred by shallow furrows running along its length. At its upper end each gall bore the scales of a withered bud or an oval scar from which the scales had fallen. Flanking the scar were two rounded swellings of incipient buds. Many of the galls were separately developed along the twigs, being well apart from one another, hut in some cases they were crowded against one another so that three or four galls occupied one inch of the length of the twig, and in several instances a number of adjacent galls had coalesced to form an irregular swelling one or two inches long, along the length of a twig. 

[Two drawings of cross sections of this gall appear on page 2 of the pdf]

Range: London, Ontario

Phytophaga tumidosae (Felt) (Diptera: Itonididae) and its hymenopterous parasites reared from the scarred gall of willow