Back in the days before 'green' we used to spray a thin film of oil over lying water and swamp, and it used to kill the larvai when they came up to breath.
Didnt get them all, but reduced the population quite a bit.
A good repelant, is Avon Oh So Soft.
Used that fishing in Scotland during Midge season, and found it very good.
Yeast tablets also work, but you have to take them several weeks ahead.
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