As soon as the ice goes out and mud season ends in Western Maine, the mayflies arrive like an uninvited army.
One minute you’re enjoying a quiet evening by the lake, the next you’re swatting clouds of them while they coat your porch, dock, and even your horses (yes, they can trigger Potomac Horse Fever).
If you’re tired of mayflies ruining your spring and summer at the lake, these 5 battle-tested, practical tips will help you fight back, naturally and effectively, without dousing your rural property in harsh chemicals.
Here are the 5 battle-tested ways to banish mayflies and enjoy bug-free lake days this summer.
5 Proven Ways to Banish Mayflies at Your Maine Lake This Summer
1. Clean Up Their Breeding Grounds
Mayflies lay eggs in standing water, mud, and debris. The cleaner your shoreline and yard, the fewer they’ll return.
- Remove leaves, sticks, and organic debris from around the water’s edge.
- Eliminate any standing water in buckets, tarps, or low spots.
- Keep docks, porches, and walkways clear of clutter.
- Trim back aquatic plants close to your property if possible.
Pro tip: Do this cleanup right after ice-out for the biggest impact.
2. Set Up Effective Traps
Traps catch mayflies before they overwhelm your space.
- Hang yellow sticky card traps or fly tape around porches, docks, and outdoor seating areas. (These help with cluster flies, too!)
- Place them near lights — mayflies are strongly attracted to light at dusk.
- Try CO₂ traps for larger areas (they mimic breath and draw it in).
Last year, the swarms were so bad we couldn’t sit outside after dusk. Traps made a noticeable difference.
3. Use the Garlic Repellent Hack (Readers’ Favorite)
Adult mayflies hate the strong sulfur smell of garlic.
Simple Garlic Spray Recipe:
- Crush or chop 4–6 cloves of garlic.
- Steep in a pot of boiling water for 15–20 minutes.
- Cool, strain into a spray bottle, and apply around porches, railings, doors, dock edges, and lights.
- Reapply every 2–3 days or after rain.
It’s cheap, completely safe for pets and horses, and surprisingly effective.
4. Deploy Natural Repellents & Candles
- Use citronella, lavender, peppermint, eucalyptus, or lemongrass essential oils in sprays or diffusers.
- Burn citronella candles or torches around seating areas in the evening.
- Plant repellent plants like marigolds, basil, or chrysanthemums near high-traffic spots.
These won’t eliminate every mayfly, but they make outdoor time much more enjoyable.
5. Dress Smart & Protect Yourself
- Wear light-colored long sleeves, pants, and a hat at dawn and dusk.
- Use head nets or mosquito netting over seating areas if the hatch is heavy.
- Keep outdoor lights off or use yellow “bug lights” when possible.
Types of Mayflies
Over 600 species of mayflies are found across the United States. Common types include the Pale Evening Dun, Iron Blue Dun, and Green Drake.
The life cycle of mayflies is fascinating. They start as nymphs living in water for up to two years before emerging as winged adults for just a brief mating period, often a single day.
Eastern regions, such as the Appalachians and the Great Smoky Mountains, boast high mayfly diversity. Western rivers and streams also host numerous species vital to trout and aquatic ecosystems.
Identifying specific mayflies helps anglers match hatches for successful fly fishing.
Are There Mayflies in Maine?
In Maine, where we live, several different mayflies thrive in the state’s numerous rivers, streams, and lakes. The most common ones include the Hendrickson mayfly, the March Brown mayfly, and the Green Drake mayfly.
These insects play a crucial role in aquatic ecosystems, serving as food for fish and other wildlife. While mayflies have a brief adult lifespan, ranging from a few hours to a few days, their presence signals a healthy waterway.
Anglers eagerly await mayfly hatches to take advantage of the feeding frenzy they create among trout and other game fish.
Use Insecticides (Last Resort Option)
While natural methods work well for most situations, insecticides can be used as a last resort when mayfly numbers are overwhelming.
Choose products labeled for flying insects or mayflies, and always read the label carefully before use. Sprays, dusts, or granules are common options. For best results, apply in the early morning or evening when mayflies are most active.
Important Safety Note: Always wear protective clothing, use in well-ventilated areas, and keep children, pets, and horses away from treated surfaces until dry. Avoid spraying directly near water, as mayflies are part of the natural lake ecosystem.
What is The The Mayfly Lifecycle?
The Mayfly is known for its short lifespan, as it passes through the various stages of its life cycle. These aquatic insects spend most of their lives as nymphs in freshwater streams, feeding on algae and organic matter.
After one to three years, they dramatically transform into winged adults, emerging from the water en masse in a phenomenon known as a “hatch.” Adults live for only one day to a few weeks, during which they mate and lay eggs before dying.
Although their lives may be brief, these flies play a critical role in the ecosystem, serving as a vital food source for many other species.
Conclusion: Enjoy Your Bug-Free Lake Summer
Mayflies are a natural part of lake life in Maine every spring, but they don’t have to ruin your time outdoors.
By combining breeding ground cleanup, effective traps, the garlic spray hack, natural repellents, and smart protection, you can dramatically reduce swarms and reclaim your porch, dock, and evenings with family and horses.
Whether you prefer all-natural solutions or need a stronger option as a last resort, these practical steps will help you enjoy the peaceful beauty of your rural lake property instead of battling bugs.
Don’t let mayflies keep you indoors this summer. Take action now, and make the most of your lake days!
When do mayflies come out in New England?
The season typically begins in May and lasts approximately a month.
What repels adult mayflies?
The scent of garlic repels mayflies. Brew some hot garlic tea.
What time of day are they most active?
Dawn and dusk are the most popular times of day to see them flying all around.
How many times do they hatch?
They can hatch 2 or 3 times per year.
Do mayflies bite?
They do not bite, but the black flies can bite you and your pets.
Does garlic repel mayflies?
Yes! The strong smell of garlic naturally repels adult mayflies. Crush 4–6 cloves of garlic, steep in boiling water for 15–20 minutes, cool, and spray around porches, doors, docks, and lights. Reapply every few days or after rain. It’s cheap, safe for pets and horses, and chemical-free.
Lisa moved from Southern New England to the rural mountains of Maine in 2020 with her husband. Drawing from her hands-on experience with slower-paced rural living, she shares the beauty, honest realities, and simple pleasures of life in the Maine woods, along with their rural travels across the United States and abroad.
