harvest mite
US /ˈhɑːrvɪst maɪt/
UK /ˈhɑːrvɪst maɪt/

1.
a tiny red mite (Trombicula autumnalis) that lives in grass and on plants and attaches itself to the skin of humans and other mammals, causing an itchy rash.
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After walking through the tall grass, he found several itchy bites from harvest mites.
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Preventing harvest mite bites often involves wearing protective clothing and using repellents.