Also observed in some [Electracma minyops] galls from August to November were the orange larvae of a gall midge (Diptera: Cecidomyidae), possibly of the genus Dasineura Rondani (R.J. Gagné, pers. comm.). They were found in small, cup-like structures within the [Electracma minyops] gall (Fig. 8). Up to 15 larvae were present in some galls. About half of the galls were inhabited by both tortricid and cecidomyid larvae, and in the rest of the galls they occurred separately. The fly larvae also pupate in the soil, but neither pupae nor adults have been found.

From January to April neither tortricid nor cecidomyid larvae could be observed inside the young galls. Perhaps the cecidomyids laid inconspicuous eggs in or on the twigs and the young, colourless larvae started feeding, causing the gall to form. Alternatively, an unknown organism or physiological process is involved. In rare instances, both moth and fly larvae were present in the galls during January and February.