I am trying to eradicate bush snails in my collection.
Measurol, which is restricted by Federal law to people with an applicator's license, is methylthio-xylyl-methylcarbamate. Sevin, which is easily available in garden stores, is naphthyl-methylcarbamate and both are cholinesterase inhibitors.
So I purchased some Sevin 5% dusting powder. At night I would apply this to the surface of the media in pots that has bush snails and it seems to be effective in killing snails that contact it. The other week I was reading an old book, "Orchid Biology" by Dressler, and there it was recommended to use Sevin as a drench for bush snails. So I purchased some liquid Sevin concentrate and applied that as a drench to my pots last weekend. Before I started using Sevin I had also tried drenching the pots with copper octanoate 1000 ppm. These treatments seem to have reduced the number of snails but even after the Seving drench last weekend I am still seeing some when I search at night. I will probably run through most of the pesticides that I have, applying them as a drench, to try to eradicate the snails.
I was also thinking of trying to drown them by submerging the pot in a bucket of water; I wonder how long it takes for a snail to drown.
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