The tubular gall is more common in this area than is the gall of Bucculatrix fusicola. It occurs on Helianthus annuus, and as yet has not been found on other composites in the vicinity [of Austin, TX]. In this area there is considerable variation in the size, structure and the position of the galls on the plants... They have been found to range from 10 to 50 mm in length. In many cases the galls occur as polythalamous structures of ten to twenty-five divisions... Single galls are sometimes collected, but these are most often near the polythalamous galls on the main axis of the plant. Both types of galls are also found at the bases of and on the lateral branches of the sunflowers. Occasionally single galls are formed in the leaf axil or on the petiole, or even on the involucre of the flowers. Double or triple galls sometimes develop in these latter locations, but they rarely have more divisions than this.

[includes much more info re: the biology of this species]

- Osmond P. Breland & Lucille Hagan Schmitt: (1948) The Biology of Two Sunflower Gall Makers (Diptera: Cecidomyiidae; Lepidoptera: Lyonettidae)^©