Lubbers are toxic. I've only read about shrikes being able to ingest them.
According to University of Florida,
"Baits containing insecticide are often used to control grasshoppers; lubbers are attracted to bran bait containing corn oil and insecticide. Bait application will be the most effective in areas that lack competitive vegetation, as lubbers will be less likely to eat bait if there’s attractive vegetation in the area."
Maybe you can use pieces of the lubbers' favorite target out of your garden (like aloe leaves) in place of bran.
