Posted: 18/06/2014 at 07:03
Is that fertiliser on the compost of the sweetcorn? If so, that looks to be much too much! Scrape most of it away and then give them a really good watering.
Sweetcorn needs a lot of water and the compost looks very dry.
I would fill those pots right up to the top, let it drain away and then do it again.
I think the sunflowers are thirsty too and from what I can see again, if that's fertiliser remove it.
As for the fly, I've had some similar ones on my roses - not sure what they are but possibly one of the parasitic ones whose larvae eat various pests. I've left mine well alone