Mayfly Facts & Information

Protect your home or business from mayflies by learning techniques for identification and control.

Order Ephemeroptera

Treatment

How do I get rid of mayflies?

What You Can Do

Most people want to prevent mayflies from coming into the home. Inspect the outside of the building to find any openings that might allow them to get inside. Make sure screens are repaired on windows. Check exterior doors to be sure they close tightly.

A vacuum that has a HEPA filter can quickly remove mayflies that get inside. A broom and dustpan are also handy tools for removing mayflies.

It is advisable to call pest control professionals for an inspection and evaluation. They will be able to provide advice for pest-proofing the home and keeping it pest free.

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Behavior, Diet & Habits

Understanding Mayflies

Appearance

They have two pair of wings, so they are not related to house flies or other true flies. Flies have only one pair of wings. There are many species of mayflies. They are very slender insects. Some mayflies are very small—1 mm long. Others are longer—up to 30 mm long. The color varies, but many have dark bodies. The wings are pale. The wings may be yellow, gray or even clear. Mayflies hold the wings together above their body when they are resting. Mayflies are aquatic insects.

Behavior, Diet & Habits

Mayflies are also called shadflies and lake flies. They are aquatic insects. They are attracted to light. They become a nuisance to people when they gather at night near doorways of homes and businesses. They sometimes gather in large numbers. Mayflies are members of the insect order Ephemeroptera.

Adult mayflies live a very short time. The males die after mating. Females die after laying their eggs. Shed skins and mayfly bodies dry out and crumble easily.

Reproduction

The females lay eggs in water. They prefer clean, fresh water. When the eggs hatch, the immature insects (nymphs) live near the bottom. They feed on organic material. Fish and other insects eat these nymphs. When the nymphs are mature, they leave the water. They spend a day or two drying off and shedding their skin. Then they fly away to mate and lay eggs.

Light

Mayflies are attracted to light. They gather in large numbers around homes and commercial buildings. Making the building less attractive to mayflies is the first step in controlling a mayfly problem. Porch lights can be changed from white bulbs to yellow bulbs. Porch lights and lights attached to buildings may need to be moved away from the building. Consider reducing the light that shines from windows to avoid attracting mayflies to them at night. Insect light traps that use UV light may be helpful in attracting mayflies away from the building.

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