Question: What is it that slugs/snails love about beer?

[canetoad]

They were wreaking havoc on my new winter vegies. I have a dog, as do most of my visitors, so am reluctant to use snail bait no matter how well secured it is.

Yesterday I put out three greased containers with a small bottle of beer shared among them and have a large haul of mainly slugs this morning. The beer cost $4!

I have ingredients for baking; it would be far cheaper to use my own yeast, sugar, etc if that's what the snails love. Any advice?

[usonian]

1. More than you ever wanted to know.

https://thedrinksproject.com/why-are-slugs-attracted-to-beer/

[canetoad]

2. Yes it is

But thank you for looking this up. I just want to know if a bit of yeast in water will do the same ... you know how it is.

[usonian]

3. Cheap enough to find out.

There are mouse traps that you make with a little diving board or pie tin on a pivot on top of a 5 gallon paint bucket.

with a ramp.

Bait it with peanut butter.

Pacifists can leave the bucket dry. But then you have to find a new home for the little you know whats.

[canetoad]

4. I've found an error

In the slug info - it says they are attracted to alcohol. The beer I bought (unknowingly) was zero alcohol, so can say for sure that's not the prime attractant.

[usonian]

5. Upon reread, it seems that they go overboard on the alcohol.

...
Looks some more.

https://plantgrowerworld.com/beer-and-slug-attraction-solutions/#Modern_Brewery_Practices_Coping_with_Slugs

In addition to ethanol, other byproducts like carbon dioxide and volatile organic compounds (VOCs) also contribute to the attractiveness of beer for slugs. These VOCs include aldehydes, esters, and terpenes that are released during fermentation.

Interesting.
https://www.chefsresource.com/why-do-slugs-like-beer/#Why_This_Attraction_The_Science_Behind_the_Slugs_Brew_Preference

Why This Attraction? The Science Behind the Slug’s Brew Preference

Slugs are drawn to beer primarily because of the fermenting sugars it contains, which provide a readily available source of energy and nutrients. Furthermore, the yeast and other byproducts of the brewing process release attractive odors that slugs use to locate food sources.


Slugs, often seen as garden pests, possess a keen sense for identifying nutrient-rich food sources. Their preference for beer isn’t some random indulgence; it’s a carefully calibrated response to specific chemical cues. Unlike humans, slugs don’t “enjoy” beer in the same way we savor a flavor profile. Instead, they are drawn to the sugars produced during fermentation, particularly maltose and glucose, which offer a quick energy boost crucial for their survival and reproduction.


The attractiveness is further amplified by the yeast cells present in beer. Dead or alive, these cells are packed with amino acids and proteins, essential building blocks for slug growth and development. The aroma, created by volatile organic compounds emitted during fermentation, acts as a homing beacon, drawing slugs in from considerable distances. This explains why you often find multiple slugs congregating around a single beer trap. Think of it as an irresistable, slow-moving gastropod rave.


Interestingly, the type of beer can also influence its appeal. While slugs are generally attracted to most beers, those with higher sugar content and a stronger yeast aroma tend to be more effective lures. Darker beers, like stouts and porters, often fit this profile due to their richer malt content. This doesn’t mean lighter beers are ineffective, just that the drawing power might be slightly reduced. Ultimately, any beer provides a convenient, liquid-based buffet that requires minimal effort for slugs to access and consume

[eppur_se_muova]

8. Based on that last para, Malto Goya (a few $$$/sixpack) might work as well.

?

[fargone]

6. If you look at slugs and how they slowly squidge along

It becomes obvious they are searching for some hops.

[canetoad]

7. I was scared someone

Would say that.