Source: Felt, P. E. Plant Galls and Gall Makers.
Jodhpur, India: Agrobios, 2001. p 233.

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BROWSING OPTIONS: Gall Names Gall Appearance Type of Tree Compare Galls

Gallmaker:
Pachypsylla mamma
Tree type:
Celtis occidentalis
Photo: Numerous mammiform "Hackberry nipple galls" on a Northern Hackberry (Celtis occidentalis) leaf (underside).

Gall maker: Pachypsylla mamma Riley; a species of jumping louse or psyllid (Order Homoptera, Family Psyllidae). The hackberry is a favored gall site for the Pachypsylla genus, and many hackberry leaves are often badly deformed by infestation.

Shape and Size: Galls are roughly "nipple" shaped, and may be very elongate or roughly spherical. Approx. 0.4 to 0.5 cm in diameter.

Location: Occur on the underside of Celtis leaves, usually in summer.

Color: Greenish to yellow-green, decaying to brown when open (see photo).

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