Ambrosia ragweed, bitterweed, bloodweed

Dichotomous table for leafminers

1a pinnately branched corridor, its main and secondary branches overlying the midrib and side veins; pupation outside the mine: Liriomyza strigata

1b corridor not or little branching, not associated with the leaf venation; pupation within the leaf in a, usually lower-surface, pupal chamber: Chromatomyia cf. syngenesiae

1c galls, etc => Tables for all parasites per species

mod 9.x.2017