1a larve donkergekleurd, met goed herkenbare kop; oudere larven leven vrij tussen samgengesponnen bladslippen: Cnephasia incertana

1b larven zijn bleke maden; ze mineren tot kort voor de verpopping: Phytomyza ferulae

1a larva darkly coloured, with well recognisable head; older larvae live free among spun leaf segments: Cnephasia incertana

1b larvae are colourless maggots; they mine until just before pupation: Phytomyza ferulae