I’ve found BT israelensis to be effective on fungus gnat larva, but in a greenhouse. It might be worth a try on onion maggot larvae too. I’m growing some Zebrune and Ambition shallots started from seed in the greenhouse and then set out in a raised bed similar to yours. But I did do a more traditional spacing of a couple of inches apart. I love the way the Ambition stores and am still using some from last season in cooking. This is my first try with Zebrune. What variety are you growing?
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Happy garden trails, Dawn
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