Garden slug attacks come in waves

Garden slug attacks do indeed come in waves, largely driven by their biology and environmental conditions. Slugs are most active during periods of high humidity and mild temperatures, particularly in the spring and fall^[1][2]. These conditions favor their movement and development, leading to sudden, intense periods of plant damage. After rainfall or when the weather turns damp and warm, slug eggs hatch in large numbers, and previously dormant slugs emerge from hiding, creating a "wave" of feeding activity that can devastate vulnerable plants overnight^[3][4][1].

Slugs are not random wanderers; their emergence is tightly synchronized to cues such as temperature and moisture. During drought or hot, dry spells, they retreat underground or seek shelter, often going unnoticed for weeks or months. When rain returns, these hidden populations quickly become active again, making the attack feel sudden and overwhelming^[4][1]. Each wave corresponds to a new generation hatching or a favorable weather window, rather than a constant trickle of activity^[4][2].

To minimize losses:

• Protect young, tender seedlings and vulnerable crops during peak periods^[3][2].
• Begin control measures early in spring, before major hatching events^[4][2].
• Use a combination of physical barriers, traps, and biological controls to intercept slugs as their waves begin^[4][5][1].
• Regularly inspect and adapt your defenses, as slug pressure changes with the seasons and local moisture^[4][3].

Not all slugs are harmful—many species eat decaying organic matter rather than live plants^[3][6]. However, managing the pest species requires anticipating and disrupting the predictable waves of attack.

Key caveat: Complete elimination is unrealistic, but understanding and preparing for these cycles is essential for long-term success^[3][4].

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• https://environmentalfactor.com/unveiling-the-world-of-garden-slugs/    
• https://extension.oregonstate.edu/news/control-slugs-now-they-lay-eggs-hatch-spring    
• https://www.gardenersworld.com/plants/how-to-stop-slugs-eating-young-plants/     
• https://www.youtube.com/watch?v=kR_NunTG-nk       
• https://beekman1802.com/blogs/almanac/slug-snail-control 
• https://www.gardenorganic.org.uk/expert-advice/garden-management/pests-and-diseases/slugs-and-snails