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Grow Your Own / Re: safe to plant veggies in soil that has been previously treated with ant powder?
« Last post by Aunt Sally on Today at 14:50 » Deltamethrin is a form of Pyrethrum so should be okay.
The grubs are what the nematodes attack - you'd see small white C-shaped grubs in the compost if you tipped it out for a bit - best to check whether that is the issue before spending money on them
https://www.rhs.org.uk/biodiversity/vine-weevil