Slugs & Science, a question

The problem:    Five days ago I used a slug bait/control ( Bug-Getta Plus by
Ortho ) the next day after a rain.   The suggested rate was 3 pounds for up
to 10,000 square feet.  I applied 3 pounds on 2,000 square feet.  This
morning I checked a piece of watermelon rind placed within the treated area,
only to find about  30 half grown slugs.

The question revolves around the use of the product  "  Merit "   (
manufactured by the Bayer corp. ).   The local garden center sells three
different preparation ( using the generic name for Merit ).   The labels,
taken collectively,  cover grass / trees & shrubs / ornamentals.   It is a
systemic,  and states that the period of protection is all season.   The
label goes on to state that the product is very toxic to  " aquatic
invertebrates " .   The label neither includes or excludes  Hostas or slugs.
Does any one have the science or experience using this product and Hosta.

Thanks in advance,   Brian    ( Slugging it out in Northwest Indiana )
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