Under what condition is a faint smell of citrus unlikely to deter woodlice from settling?
Answer
If the area is perfectly damp and rich in decaying wood or leaf litter
The effectiveness of any scent-based deterrent, such as citrus oil, is highly conditional and secondary to the woodlouse's fundamental environmental needs. If an area provides the creature's primary requirements—ample moisture and readily available decaying organic food sources—the presence of a mild, non-toxic odor will likely be ignored. Woodlice are driven by biological necessity (thirst and hunger) rather than olfactory preference when resources are scarce elsewhere. Therefore, if a location is damp and full of rotting material, the woodlice will settle in despite a faint citrus smell because the required habitat conditions are met.

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