Our runner beans are surrounded by hoverflies, and their larvae will eat & so control the blackfly on the runner beans.
The hoverflies mimick wasps by having the same colouring, so they are left alone and avoided by other animals!
The following photo shows a hoverfly on a runner bean flower – it is on the top left of the photo.
Unfortunately it is much easier to see the blackflyon the runner bean plants!
There is always a time lag whilst the controlling insects build up their numbers, & the pest increases. Hopefully the hoverflies will soon have the blackfly on the runner beans under control!
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