{"id":445,"date":"2026-07-16T00:26:11","date_gmt":"2026-07-16T00:26:11","guid":{"rendered":"https:\/\/blogs.oregonstate.edu\/hazelnuts\/?p=445"},"modified":"2026-07-16T00:26:12","modified_gmt":"2026-07-16T00:26:12","slug":"spider-mites-in-oregon-hazelnuts-species-and-symptoms","status":"publish","type":"post","link":"https:\/\/blogs.oregonstate.edu\/hazelnuts\/spider-mites-in-oregon-hazelnuts-species-and-symptoms\/","title":{"rendered":"Spider mites in Oregon hazelnuts: species and symptoms"},"content":{"rendered":"
\"Hazelnut<\/a><\/div>\n\n\n
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<\/div>

Nik Wiman<\/p><\/div><\/div>\n\n

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Immature two-spotted spider mites Tetranychus urticae <\/em>on a hazelnut leaf. The red spots are the eyes, not the spots referenced in the common name of the mite. The spots are dark lateral splotches that are not always present especially in immatures. This is the most common spider mite in Oregon hazelnuts. Photo: N. Wiman.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

Background<\/h2>\n\n\n\n
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Growers may not be aware that spider mites can be problematic in hazelnuts. There is very little research or literature on the topic, and our industry tends to focus more on bud mites because they directly impact yield. Spider mites aren’t insects, they’re arachnids (class Arachnida, the same broad group as spiders) in the the subclass Acari (mites and ticks) in family Tetranychidae (spider mites). Adults spider mites have eight legs rather than six, and they don’t have wings or the three-part body segmentation typical of insects. Bud mites are from different mite families than spider mites (Eriophyidae and Phytoptidae).<\/p>\n\n\n\n

Spider mites are small, usually under a millimeter, so they’re barely visible to the naked eye and are usually first noticed by their damage or webbing rather than the mites themselves. They feed by piercing individual plant cells with needle-like mouth parts and sucking out the contents. That cell-by-cell feeding is what produces the fine stippled or bronzed look on leaves.<\/p>\n\n\n\n

They also reproduce very quickly, especially in hot, dry weather, going from egg to adult in as little as a week or two under warm conditions. That fast life cycle is why populations can go from unnoticeable to damaging in a short window, and why they’re generally considered a warm season, drought stress associated pest. Severe infestations on hazelnuts can cause substantial leaf drop. So they do not impact yield directly but they do hurt tree vitality.<\/p>\n\n\n\n

Species<\/h2>\n\n\n\n

The two-spotted spider mite, Tetranychus urticae<\/em>, is the typical hazelnut spider mite. Two- spotted spider mites pass through several life stages: egg, six legged larva, eight legged protonymph and deutonymph, and finally the adult. Adult females are typically pale to greenish yellow with two dark spots on the body, though spot intensity can vary with feeding activity and life stage. Fine webbing on the underside of leaves is often the clearest field sign of an active, established colony, since it typically appears once multiple generations are present together.<\/p>\n\n\n\n

Recently, we became aware of another spider mite species affecting hazelnuts thanks to an observant field consultant. This species is the hazelnut mite, Tetranycopsis horridus<\/em><\/em>. It has been diagnosed from Oregon in the recent past, but it is not included in historic pest management literature from OSU, which could indicate it is a recent invader from Europe. It was recorded as a new invader in Argentina on hazelnut in 2016.<\/p>\n\n\n\n

How hazelnut mite is different:<\/strong> While it is a spider mite, unlike most other spider mites, it does not produce webbing and it is free roaming on the leaf. It is also large, dark brown, hairy, and relatively fast. It causes a different leaf symptom. Rather than bronzing from individual colonies on webbing, the whole leaf becomes stippled giving a distinct look to the tree. Please let me know if you see infestations of this mite<\/em>, we have no idea how common it may be.<\/p>\n\n\n\n

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Western predatory mite Galendromus occidentalis<\/em> feeding on bud mites within a hazelnut bud. It also free roams on the tree and is one of the most important natural enemies of spider mites.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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Bronzing on the leaf where there are colonies of two-spotted spider mites. Closer examination will show webbing and many individual mites and eggs. Photo: N Wiman.<\/figcaption><\/figure>\n\n\n\n
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Leaf drop from a spider mite infestation can be severe and represents lost productivity. Typically, this is a late season issue, but scouts should keep tabs on the populations.<\/figcaption><\/figure>\n\n\n\n
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Hazelnut tree damaged by hazelnut mite, Tetranycopsis horridus<\/em><\/em>. Photo: Tyler Bruck.<\/figcaption><\/figure>\n\n\n\n
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Close up of leaf with damage from hazelnut mite, Tetranycopsis horridus <\/em><\/em>with mites visible (no magnification). Photo: Tyler Bruck.<\/figcaption><\/figure>\n\n\n\n

Growers should also watch for the western predatory mite (Galendromus occidentalis<\/em>), a natural enemy that can suppress two-spotted spider mite populations without intervention. Predatory mites are generally faster moving, more translucent, and lack the paired dark body spots of T. urticae<\/em>. Distinguishing the two is an important first step before deciding whether treatment is warranted, since preserving predator populations is often the most effective long term strategy for keeping pest mites below damaging thresholds. <\/p>\n<\/div>\n<\/div>\n\n\n\n

\"\"
Hazelnut mite, Tetranycopsis horridus<\/em><\/em> under magnification. Note the rounded body shape, dark brown coloration and hairy appearance. Identified and photographed by Bill Gerth, OSU Insect Clinic.<\/figcaption><\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

spider mites can be a pest in hazelnuts and there is a new species. 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