October 31, 2026, 12:04 pm | Read time: 5 minutes
From late summer to the end of fall is harvest mite season. During this time, the larvae of harvest mites actively seek hosts. PETBOOK explains why this can be dangerous for cats and dogs and how you can protect your pet.
Overview
What are harvest mites?
The so-called harvest mites (also known as autumn mites, grass mites, harvest mites, or hay mites) belong to the class of arachnids and thus to the family of running mites. The adult mites feed exclusively on plants.
Until adulthood, the larvae live parasitically and feed on cell fluids and lymph from mammals or humans. They climb up plants, sometimes even knee-high, and from there infest their host. By using their mouthparts to scratch the skin, they dissolve the skin tissue with their saliva and drink it. The saliva causes intense, long-lasting itching.
Harvest mites infest mice, dogs, cats, and other mammals, as well as humans. The orange-yellow larvae are particularly noticeable due to their unusual coloring and usually appear in large clusters on the affected skin areas. A single mite larva is about 0.3 mm in size. These parasites do not transmit from animal to animal or human, like fleas, but instead come directly from nature to their host.
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When is harvest mite season?
From June to October, depending on the weather, harvest mites are most active, as this is when the larvae hatch, which can be dangerous to mammals and humans.
Especially on warm, sunny, and dry days, the larvae gather on meadows in the grass, in leaf piles, and at forest edges. They primarily stay on dry meadows and areas to move from there to their potential host.
How do I recognize a harvest mite infestation in my pet?
Harvest mite infestation is quickly identifiable. The larvae are clearly recognizable as small, bright orange-yellow dots that appear in groups, making them easily distinguishable from other mites.
The preferred areas for harvest mites are eyes, nose, armpits, belly, groin area, between the toes, and in the ear folds (especially in cats). Intense itching can lead to widespread inflammation. In addition to the almost unbearable itching, rash, pustule, and wheal formation are typical signs of an infestation by this type of parasite.
The itching at the affected areas usually occurs a few hours later and can last up to two weeks in the worst case.
After a few hours, the larvae are usually full and drop off on their own to continue living as vegetarian adult mites on the ground, but the itching in the affected animal persists.
The most effective method is still direct fur inspection and thoroughly checking the animal for possible parasite infestation after a walk or outdoor time. Combing and brushing can also help quickly identify and remove the parasites before they bite.
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What can I do if I detect an infestation in my pet?
Since the mite larvae hardly move on the animal, they can be easily collected or washed off. If water or wiping with a damp cloth is not enough, there are also special anti-mite shampoos for animals.
Alternatively, you can rub the fur with natural remedies like olive oil or apple cider vinegar to combat the pests.
The irritated and reddened skin areas can be soothed with calendula oil or cooling aloe vera gel. Rubbing the itchy areas with an ice cube can also quickly provide relief.
What preventive measures can help?
Before walking the dog, it is recommended to rub the vulnerable skin areas with strong-smelling preparations, similar to tick prevention, to repel the parasites. Black cumin oil, diluted propolis solution, or coconut oil are excellent for natural defense.
For cats, prophylaxis over the fur is much more difficult. Essential oils are off-limits for cats, and they often do not willingly allow themselves to be rubbed. In heavily infested areas, it may be best to keep the cat indoors during the day and only let it out at night.
To be completely sure, you can test favorite meadows, your garden lawn, or green areas frequently used by your pet for harvest mites yourself. To do this, place a white cloth, piece of paper, or plate in a sunny spot on the lawn. The parasites will naturally move onto the white surface over time and are quickly recognizable due to their distinctive color. If it is confirmed that the unwanted pests live there, frequent lawn mowing can help minimize or drive them away.
During peak season, harvest time, and in heavily infested areas, try to avoid forest edges, meadows, green areas, or proximity to bodies of water during walks with the dog and keep the dog on a leash on the path.
The best time for a long walk with the dog is in the morning or at dusk.