| DESCRIPTION: Fly - 4 to 8 mm dark bodies, clear wings with D-shaped bands | |||||||
| BACKGROUND | LIFE CYCLE | ||||||
| Availability | Habitat | Adult Emergence | Egg Laying | Larva Development | F1 | Adult Life Span | Over Winters |
| G | Wherever Bull thistle is established | June | July into flower head | Flower head | 1 to 2 months | Larvae in seed head galls | |
| ATTACK | COLLECTION | NOTES | |||||
| Stage | Damage | Life Stage | Method | Adult males emerge in early June to establish territories. | |||
| Larva - | Seed head | Larvae late August to November | Clip seed head | ||||