gallfly
/ˈɡɔlˌflaɪ/
noun
- A small insect that lays its eggs in plant tissues, causing the plant to form a growth called a gall.
- The gallfly laid its eggs on the oak leaf, and a round gall formed around them.
- Each species of gallfly usually attacks only one specific type of plant.
- Farmers sometimes worry about gallflies damaging their crops.