Which bug spray is safe for largemouth bass fishing — does DEET really repel bass and melt soft plastics?

Both, and bass are the species it is documented for. Keith Jones's Berkley lab work found bass strongly repelled by DEET at around one part per million, and that one application on the hands can contaminate lures for 90 minutes or more. DEET is also a plasticizer: it softens monofilament, soft plastics, lure paint and sunglass frames. Buy 20 % picaridin lotion or wipes instead — it does not attack plastics. Treat clothing with permethrin at home and let it dry; never at the water, because wet permethrin is highly toxic to fish. A Thermacell-type unit or a head net keeps it off your hands. For largemouth the damage is concentrated in the soft-plastic box: worms, creature baits and jig trailers are both the slow, tasted presentations and the materials DEET dissolves. Spray downwind of the tackle, apply with the back of the hand.

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