About Phytomyza chaerophylli Kaltenbach, 1856
Larvae of Phytomyza chaerophylli create short upper-surface leaf mines that follow leaf margins and gradually widen. In the limited space of some umbelliferous leaves, this mine often develops into a secondary blotch. Frass is deposited as isolated grains arranged in two messy rows. When ready to pupate, larvae exit the leaf through a semi-circular cut in the lower leaf epidermis and complete development in the soil. The main recorded host plant for this species' larvae is Sison amomum. Mines and larvae can be found through the winter, with the first generation active between April and July, and feeding larvae present through most of the year. Phytomyza chaerophylli is widespread and common across much of Europe.
