Ipomoea morning glory, sweet potato
Dichotomous table for leafminers
1a Irregular, full depth blotch without frass; under the leaf a loose spinning, in which some frass grass have been trapped: Bedellia somnulentella
1b long, generally upper-surface gallery: Liriomyza trifolii
1c galls, etc => Tables for all parasites per species
Not included in the key (probably incorrectly referred to this plant): Pegomya setaria.