Bordeaux mixture painted on a tree trunk to repel and exclude brown garden snail, Cornu aspersum.

Bordeaux mixture, blue green copper sulfate and lime, painted on lemon Citrus sp. trunk to exclude brown garden snail. Santa Barbara Co., CA.  Credit: David Rosen
Bordeaux mixture painted on a tree trunk to repel and exclude brown garden snail, Cornu aspersum. Credit: David Rosen