We transplanted an assortment of pretty flowers for our windowsill some weeks ago (albeit rather crudely) and they were growing bright and healthy. Over the last week, however they've been plagued! I live in Scotland and suspect the pest is the midge.
The predominant flower is Phlox drummondii and this is the flower that is preferentially being eaten by the larvae, starting at the root and lower stem, reducing them to withered hairs (circled); then when the plant collapses the buggers eat the leaves!
I've tried bug spray but this has had little or no effect in trammelling their advance. Many have now become adults. Any advice appreciated!