Hi Jonathan, I'm facing the same leaf miner situation on string beans. I heard about Neem Tree leaves with garlic concoction or neem oil for natural pesticide spray against leaf miners. I don't have Neem Tree so I haven't tried it yet.
Has anyone tried Neem? Was it effective?
I have read a lot of articles about Neem, and the authors seem to say that they are effective against leaf miners. I haven't tried it though, since I also do not have a Neem tree.