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up vote 11 down vote accepted

Propanoic acid is toxic against many types of mold, fungi and bacteria (wiki), but same time has almost no effect to C. elegans ("fivefold less", reference). This is why propanoic acids and (more commmon) its salts are used as conservants for C.elegans cultures (as well as for other animals, like Drosophila).

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Another anti-fungal compound we use in our fly lab is methylparaben. – jreut May 17 '12 at 18:04
We use nystatin. I don't think the use of propanoic acid with C elegans is that common. Fly people use it a lot. – Leon Avery Jan 27 '15 at 14:00

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