BA>different strain than thuricide or dipel. You could just put a tablespoon orBA>two of kerosene on the surface or even a thin layer of cooking oil.
I tried the cooking oil but it got a bit messy . I like the screen
over the barrels idea.
An interesting approach. Can't think of any reason it wouldn't work if
the layer were thick enough (I would guess 3-6"), but there are two
things you will want to do if you try this:
(1) some sort of retainer or cover so that wind doesn't pick the
styrofoam out of the barrel and blow it around
(2) an overflow outlet located somewhere so that rain water doesn't fill
the barrel high enough to push the styrofoam out of the barrel.
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