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I'm having a problem with black aphids. Not on my plants. Every morning for the past 6 or 7 days, my front door sill, which is white, has been covered with these aphids. There are none that I can see on the roses either side of the front door, and they don't have wings, so are not flying here. I'm at a loss to know where they are coming from, and why they are congregating on my doorstep. i've sluiced the step every day with soapy water to get rid of them, and the next morning there are more again.
This is the few that have come since I washed the step today
This is the few that have come since I washed the step today
