Chromatomyia syngenesiae on Smooth Sow Thistle

Chromatomyia syngenesiae on Smooth Sow Thistle

Observation - Chromatomyia syngenesiae on Smooth Sow Thistle - UK and Ireland. Description: Looking through a magnifying glass up to the light, you can see a dark tiny spot at the end of each track / line. Assumed culprit.

Looking through a magnifying glass up to the light, you can see a dark tiny spot at the end of each track / line. Assumed culprit.