The Ultimate Red Mite Season Guide

Everything you need to know to prevent, detect and eliminate red mites before they take over your flock.

Red mite season is one of the biggest health challenges facing backyard chickens in New Zealand. Every spring and summer we see a huge increase in infestations, and unfortunately most owners don't realise they have a problem until their birds are already suffering.

Although tiny, red mites can have a major impact on flock health. They feed on your chickens' blood at night, hiding in cracks and crevices during the day, which makes them difficult to detect until numbers have exploded. Heavy infestations can cause anaemia, reduced egg production, weight loss, poor feather condition, stress, weakened immunity and, in severe cases, even death. Young, elderly and already unwell birds are particularly vulnerable.

The good news is that red mites are preventable, and when caught early they are much easier to eliminate.

This guide brings together everything you need to know to identify, prevent and eliminate red mites, helping you protect your flock throughout the high-risk spring and summer months.

Poultry red mites crawling over DE

What Are Red Mites?

Red mites (Dermanyssus gallinae) are tiny blood-feeding parasites that live in the cracks and crevices of chicken coops.

Unlike lice, they do not spend their entire lives on the bird.

Instead they:

  • Hide during the day
  • Crawl onto birds at night to feed
  • Return to hiding places before daylight

This makes them surprisingly difficult to find until populations explode.

A single female can lay dozens of eggs during her lifetime and, under warm conditions, populations can increase incredibly quickly. During peak summer weather an infestation can go from almost unnoticed to severe in just a few weeks.

When Is Red Mite Season?

In New Zealand, red mites become most active as temperatures rise.

Typically this means:

  • Early spring
  • Spring
  • Summer
  • Early autumn

Warm nights dramatically increase breeding rates, which is why infestations seem to "appear overnight."

This is why prevention before spring is so much easier than treating a severe infestation in mid-summer.

  • 1. Monitoring & Early Detection in Your Coop

    It’s a good idea to inspect your coop at least once a week, as red mites are masters at hiding. Check the most common spots: under perches, inside nest boxes, in cracks or joins of the wood, and under any slats or edges. A bright torch at night is especially helpful, as that’s when mites come out to feed. You can also try simple tricks like sliding a piece of corrugated cardboard into cracks (mites will crawl in), or using sticky traps to catch them.

    Keep an eye on your chickens too. Signs of a red mite problem include:

    • Chickens restless at night or reluctant to perch
    • Pale combs or wattles (a sign of blood loss/anaemia)
    • Sudden drop in egg production
    • Feather loss or poor feather condition
    • Avoiding the nest boxes or even the whole coop

    Catching mites early makes a huge difference, the sooner you spot them, the easier they are to manage.

  • 2. Biosecurity & Prevention

    Keeping your coop clean and well-maintained is one of the best ways to stop red mites from moving in. Here are some easy steps you can take at home:

    • Block hiding spots: Seal up cracks, gaps, and joins in your coop where mites love to hide. A smooth, well-kept coop is much harder for them to invade.
    • Keep equipment clean: Wash and disinfect feeders, drinkers, and tools regularly. If you use second-hand gear, always give it a good scrub before it goes near your birds.
    • Deep clean regularly: Every so often, do a full clear-out and scrub-down of the coop. This breaks the mite life cycle and gives your chickens a fresh, healthy environment.
    • Discourage wild birds: Keep wild birds away from your coop and feed. Cover or clean up spilled grain, block entry points, and remove any nests near the housing.
    • Reduce clutter: Be mindful of junk, old timber, stacked pots, or anything that creates dark nooks and crannies around your coop and run. Red mites love to hide in these spots and can easily spread back into your housing.

    A little prevention goes a long way, these simple habits can keep red mites under control and your flock happy and healthy.

  • Cleaning & Disinfection

    Red mites are tough little pests, and once they’re in your coop, they can be hard to shift. Regular deep cleaning is one of the best ways to keep them under control and stop them from coming back.

    • Clear it out: Start by removing all old bedding, manure, feathers, and dust. Take out perches, nest boxes, and feeders if possible, so you can get into every corner. Mites love cracks, joints, and dark spots.
    • Wash down: Give the coop a good scrub with warm soapy water or a poultry-safe detergent. A stiff brush or even a garden sprayer can help. Make sure you get into joints, perches, and under nest box edges.
    • Disinfect: Use a poultry-safe disinfectant or mite spray. It’s a good idea to change products now and then to stop mites getting resistant. Pay extra attention to cracks, corners, and anywhere dark or hard to reach.
    • Dry thoroughly: Let the coop dry out completely before adding fresh bedding. Mites don’t survive well in dry environments, so good airflow and sunshine are your friends.

    95% of red mite control comes down to cleaning. Keeping up with a thorough deep clean every few months, or more often if you notice signs of mites, is the single most effective way to stay on top of infestations. A clean, dry coop makes it much harder for mites to survive and breed, while also keeping your chickens healthier, more comfortable, and more productive.

  • Column

    Treatment Options

    Managing red mite outbreaks during lay is challenging due to limited treatment options that are safe for poultry. However, effective tools are available and are best used in combination:

    Exzolt (fluralaner) is one of the only highly effective chemical treatments we have for red mites, and it should be thought of as a “break-glass-in-case-of-emergency” option. It’s an in-water treatment with no egg withholding, providing systemic control and up to 12 weeks of protection when used at the correct dose and timing. However, because it is so powerful, it should not be used routinely, overuse increases the risk of resistance, which would make this vital tool less effective in the future. Save Exzolt for major infestations where other control methods aren’t enough.

    Banshee is a natural, easy-to-use spray that helps keep red mites under control in your chicken coop. Made with essential oils instead of harsh chemicals, it works by making life harder for mites and reducing the pressure on your flock. Simply mix with water and apply to coop surfaces using a garden sprayer or trigger bottle every few days, never directly onto your birds. With low residues, less stress on your chickens, and simple application, Banshee is a handy extra tool to add to your red mite control routine.

    Bioforce predatory mites (Stratiolaelaps spp.) are tiny, beneficial mites that feed on pests like red mites and other small insects, but never on your birds. They’ve been used successfully in New Zealand for years as a natural form of biological control. By hunting and eating red mites, they help keep populations down without the need for harsh chemicals. Predatory mites are especially useful for anyone wanting to reduce chemical use, support residue-free production, or add a safe, natural layer of protection to their red mite control plan.

    Green Lightning is a surfactant-based cleaner that works by breaking down the red mite's protective waxy outer layer. Once this barrier is disrupted, the mites rapidly lose moisture, causing them to dehydrate and die.

    Osmoslay is a surfactant-based contact spray designed to kill mites directly on coop surfaces and in cracks. It works by breaking down the mite’s protective waxy layer, causing dehydration and death. When infestations are heavy, targeted spraying of perches, nest boxes, and crevices can help bring numbers down quickly. However, use with caution around birds, this product is for treating housing surfaces, not the animals themselves.

Signs Your Chickens May Have Red Mites

Many owners never actually see the mites themselves.

Instead they notice:

  • Birds reluctant to enter the coop
  • Chickens restless at night
  • Birds sleeping outside
  • Pale combs
  • Drop in egg production
  • Weight loss
  • Birds scratching more than usual
  • Blood spots on eggs
  • Tiny grey or red specks around perch ends
  • Dark staining around cracks in timber

If you wait until birds are showing obvious illness, the infestation is usually already well established.

Why Cleaning Alone Often Doesn't Work

Many people respond by thoroughly cleaning the coop.

Unfortunately this rarely solves the problem.

Red mites hide incredibly well and can survive for surprisingly long periods without feeding.

If even a small number remain hidden in tiny cracks, the infestation soon returns.

Cleaning is important, but it should be viewed as only one part of an integrated control programme.