Bidens marigold
(For a dichotomous table for galls on Bidens by Hans Roskam click here)Dichotomous table for leafminers
1a pinnately branched corridor, main branch positioned over the midrib; frass in strings: Liriomyza strigata
1b corridor, not pinnately branched, not associated with the midrib; frass in discrete grains: Chromatomyia cf. syngenesiae
1c galls, etc => Tables for all parasites per species
Dichotomous table for leafminers
1a pinnately branched corridor, main branch positioned over the midrib; frass in strings: Liriomyza strigata
1b corridor, not pinnately branched, not associated with the midrib; frass in discrete grains: Chromatomyia cf. syngenesiae
1c galls, etc => Tables for all parasites per species
Not included in the key: Liriomyza pusilla, Liriomyza trifolii.