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The pots/tubs are on membrane
QuoteThe pots/tubs are on membraneI would not mind betting that this might be the root of your problem, you may have unknowingly created a haven under the membrane for all manner of rodents and insect life.But this is only a guess based on what you have described.
If my local council didn't have stupid rules about fruit not being planted in the soil I would have a proper strawberry bed & wouldn't be having this issue. Jane