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Certainly Elassogaster probably E. vanderwulpi Hendel 1914. There is so little known of the biology for Afrotropical Platystomatidae, that control and IPM is going to be a learning curve and may have to start with first principles and whatever words for associated taxa (Tephritidae) for example.
The link with asparagus in the Afrotropical context is new and I was unaware of the E. linearis association - Tony, do you have a reference for that please?

Regards,
Andrew