Started to do some gardening with my daughter this summer. Started off fairly small with some sunflowers and courgettes. Sunflowers grew well and have since died. I need to remove these. Courgettes have grown, flowered and we've even had some lovely fresh ones to eat. There are plenty more flowers and more courgettes growing at present so looking forward to many more. However, discovered today one of the sunflower heads is covered in what appears to be small black insects/flies. They seem to have longish rear legs and some have small wings. Does anybody know what these might be? I recall we had some attack the windows earlier in the summer! These 'bugs' were mostly confined to one sunflower but did notice some similar ones in among the courgette flowers. Are these potentially dangerous to my plants or simply harmless? How can I get rid of them? (The infected sunflower has now been removed but I fear perhaps too late!) Your assistance is much appreciated!