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Pest query

PalustrisPalustris Posts: 3,829
edited July 2021 in Plants
As some folks know I used to grow Auriculas, given up on them now because of the root aphids.
However, I did sow the last lot of seed which I had as an experiment. The plants were potted up in brand new peat free compost in brand new sterile pots and put on the concrete patio in the shade of the house, well away from any of the Auriculas which I planted out in the garden.
So how come they are all now infested with root aphids?  Where did they come from? No other plants get them and there were no other plants in any case anywhere near the seedlings.
The only thing we can think of is that the aphids come in with the compost or they may have been lurking on the seed trays.
Anybody got any suggestions as to how to get rid of them? At the moment all the plants are soaking in a vile mixture of Neem oil, Provado and Washing up liquid. Not bothered if it kills the plants as they are destined for the bin in any case.
:s
Sorry this went in Plants instead of Problem solving.

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