If there are many, it takes ages to find and squash them. I tried the covering method and none surfaced! (only slugs). Dig a small hole in the grass and if you see at least one, there are probably lots. But nematodes are pricey. So far I have noticed batavian lettuce like Grenoble Red to be more resistant. Grow extra pea shoots, wild rocket, sorrel, overwintered lettuce – all resist.
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