Dip:Agromyzidae
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Agromyza nigrescens Hendel, 1920
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the initial corridor has frass in two lines

 

Food Plant: Geranium spp.(Cranesbills)

Mine: Summer

Pupa: Outside the mine

Notes: The first instar larva makes an initial corridor, with frass in two lines (as shown in the photo). Then a large irregular blotch is formed.

Data: xii.2004, Greenford, Middlesex, VC21

Image:© Rachel Terry

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