These last few weeks, slugs have been getting in under the door during the night. The door is timber and there is a very small gap between the bottom of the door and the frame. There are no other gaps or cracks.
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No. The amount of flames, presence of the fire engines and the girl’s position outside the house suggest that the fire started at least ten to twenty minutes prior to the photo. The girl had time to get out of or away from the house and is admiring her handiwork from afar.
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Oh, believe me, it works, and it’s both immediate and it’s over very quickly.
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It can, yes. The caveat is the time factor. Over a period of time, the effectiveness of the salt dissipates, especially once it’s exposed to weather, either indoors or outdoors.
As soon as salt comes into contact with any moist* part of a slug’s body or a slug comes into contact with grains of salt, a chemical reaction similar to burning and dissolving begins. The salt can be sprinkled over slugs, over their routes of travel, or a line of salt can be poured as a barrier to keep them out. Condensation, dew, rain, humidity, any other kind of moisture will “melt” the salt away, so it only lasts a few hours or a day. For those reasons, it has to be watched if expected keep them away.
Another choice is beer. It has the same killing results as salt, it can last a little longer because it’s liquid, it can be poured directly on the slugs, or poured into shallow containers in the slugs’ paths. It has its drawbacks, which are that it attracts slugs (and snails) due to the scent and its ingredients, so instead of just killing them, there will be a lot more of them coming in to investigate. Secondly, your area will smell like a brewery or a bar.
*They‘re moist all over.