Skandi, it's all in the name: peppermint makes things more tasty, spearmint kills them like a spear in the gut! ;) Definitely going to start with essential oil application before going to distilling. I'm always looking to justify distilling gear.
Cristo, I didn't know that about sheer curtains! Will be helpful for keeping birds out of the autumn olive when it fruits, which is supposedly the only thing you need to do to prevent its becoming opportunistic. Sheer curtains are also more likely to be available secondhand than ag fabric.
Hugo, I'm not thinking of direct application, but of spraying all cultivated areas with a very fine mist (hence the importance of a solid-free liquid). In 10 minutes near sundown, when all the slugs are whetting their knives, you can pass by the beds and put some napalm salad dressing on there for them. Everyone dies or is repelled, very little effort for you. If the repellent effect were very strong, you could even plumb a tank of thyme repellent into your drip watering system...but i'm getting ahead of myself.
That is a great video. I've thought of electrical repellent systems and that lays it all out so neatly. Will add that to the armamentarium, but only with rechargeable 9v batteries or solar panels + transformers if I can find them cheap enough. Unfortunately that system may keep snakes out as well, and so far they are my most effective control.
I have to add the biodynamic remedies i found
"Maria Thun makes a let-it-rot slug spray: When moon is in Cancer, collect 50-60 slugs and leave to rot in water. Next month, when moon is again in Cancer, strain liquid and spray on soil, prepare a new spray and repeat next month. Repeat for 3X at intervals of 4 weeks. Hugh Courtney reports using a tea from spruce seeds to discourage slugs. To make the tea, 3 grams of crushed seeds of Picea abies (Norway spruce) were left to ferment in 1 liter of water for two weeks. One cup of the fermented extract was added to 2.5 gallons of water, stirred for 20 minutes and sprayed on the soil and plants with good results. Similarly, Hugh makes a tea from pokeberry (Phytolacca americana) juice. Results are not clear although one Oregon grower reports success using pokeberry juice early in the year to inhibit slug reproduction."
Finally, this biodynamics company
says a seaweed preparation repels them, though the purpose of application is to fertilize. I've got seaweed for miles and need to gather it for my asparagus beds anyway.