Eutreta angusta

Eutreta caliptera

Eutreta divisa

Eutreta frontalis

Eutreta longicornis

Eutreta noveboracensis

Eutreta oregona

Galls are 5-9 mm. in diameter on S. jacobaea, and are nearly round to just irregular swellings on Ratibida as reported by Felt (1940). Usually only one gall is produced per plant. Reared E. angusta from Senecio sylvaticus and from the upper part of the root crown of S. jacobaea. Galls on Chinese aster and Senecio sylvaticus are reported as stem galls; the galls on the other host plants are upper root or crown galls.

(Crown gall on Ambrosia psilostachya, Ambrosia sp. Ratibida columnaris, Ratibida sp., Senecio jacobaea; Stem gall on Callistephus chinensis, Senecio sylvaticus)

All rearing records of this species are of the second generation which produces galls in the top half of the plant stems. The overwintering galls are probably crown or root galls. Two galls on *Bidens frondosa* were found on the node of the plant.

Stem gall on *Bidens frondosa, Chrysanthemum sp., Helianthus giganteus, H. tuberosus, Vernonia noveboracensis*

*E. divisa* has been reared from two galls of *Artemisia tridentata var. tridentata*. The galls measure 8 by 9 mm. and 7 by 9 mm. and are very much like the galls of *E. diana*.

Stem gall on *A. tridentata*

A crown gall formed (Stoltzfus, 1966) as the larva developed. No stunting of infested plants was observed in the fall of the year but in the spring as the larvae matured rapidly the stems of infested plants were sometimes severely stunted, resulting in lack of flowering.  Galls were first noticed in October when the larvae were in the second instar. By June 15 of the following year the larvae were fully grown. The first puparium was taken June 17 in northeastern Ohio. The galls form at ground level and are nearly round.  They range in size from 7 to 11 mm. The larval cavity in the gall is only slightly larger than the larva. Pupariation occurs within the gall.

Crown gall on *Aster simplex*

Galls were found on the lateral branches of *Artemisia cana* at the nodes which produced the last years growth. The size of the branch beyond the gall was generally not affected by the gall development, although in two cases where unusually large galls formed, a branch did not develop beyond the galls.

Stem gall on *Artemisia cana*

*E. novaeboracensis* is probably an oligophagous species attacking rhizomes of *Solidago altissima* and occasionally attacking one or more species of *Solidago*. Such a range of larval food follows more closely the typical pattern of the gall-forming Tephritidae.

Tunnels rhizomes, rhizome gall on *Solidago sp.*

*E. oregona* produces galls on *Artemisia tridentata tridentata* and *A. tridentata vaseyana*. The galls range in size from 3 by 5 mm. to 4 by 6.5 mm. Eggs laid in the lateral buds during June and July hatch and larvae induce galls from which adults emerge the following June.

Stem gall on *A. tridentata ssp.* 

The taxonomy and biology of Eutreta (Diptera: Tephritidae)