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Many thanks John!
I read in
Lonsdale, O. (2015). A new Afrotropical species of Phytomyza in the subgenus Ptochomyza (Diptera: Agromyzidae). African Invertebrates, 56(3), 637-643.
(here):
Phytomyza asparagi can be differentiated by usually having only a single notopleural seta medially on the notopleuron, the acrostichal setulae are usually in two rows, the pleuron is yellow with two spots on the katepisternum and meron, and the phallus is a simple membranous tube with a shorter distiphallus than that seen in the new species. Phytomyza asparagivora has an arista similar to the new species and the two notopleural setae are positioned posteriorly...
The only feature I'm able to check is the number of notopleural setae: I see only one, and it's in the middle of the notopleuron.
So is Phytomyza asparagi more likely?

I add a dorsal view for the three characteristic [of Ptochomyza] brown-to-black stripes that do not reach the posterior margin of the scutum ibid.

H. Dumas : France : La Ciotat : 13600 : 12/04/2021
Altitude : NR - Taille : 1 mm
Réf. : 279346