My pond has become a fly nursery. How can I get rid of them?

A:

Well, the good news is they are an indicator of good water quality and are a great food for your koi. The down-side is that control is pretty limited aside from physical removal as you have done. There are products containing Bacillus thuringiensis var. israelensis that are used for aquatic fly control. I would suggest asking a local pond supply store for fly control products that are safe for koi ponds.

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