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Debra from Lagrange, Ga writes

Can thuricide concentrate be used as a drench to kill fungus gnat larve in house plants?

Answer:

Thuricide concentrate is actually not labeled for fungus gnat larvae and so we are not sure of how effective it would be.  However, we do sell a product called Talstar One which is what we have always recommended for fungus gnats and works great.  You should also place your plants outside to dry out a little bit or cut down on how often you water them, if possible, and this will also decrease the fungus gnat reproduction cycle.

Answer last updated on: 12/22/2011

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