Pretty sure it's not slugs. Deep burrowing holes!
Slugs can do deep burrowing holes ... just ask a potato farmer!
https://www.google.co.uk/search?q=slug+holes+in+potatoes&rlz=1C1PRFC_enGB734GB735&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiNorLxgN7UAhVsKsAKHQ3oDOgQ_AUICigB&biw=1366&bih=613
So can wireworms .... but I don't know whether they like courgettes ...
Last edited: 27 June 2017 13:20:42
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Slugs can do deep burrowing holes ... just ask a potato farmer!
https://www.google.co.uk/search?q=slug+holes+in+potatoes&rlz=1C1PRFC_enGB734GB735&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiNorLxgN7UAhVsKsAKHQ3oDOgQ_AUICigB&biw=1366&bih=613
So can wireworms .... but I don't know whether they like courgettes ...
Last edited: 27 June 2017 13:20:42
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.