Hazelnut-Big bud mite

Phytocoptella avellanae

Cecidophyopsis vermiformis

Pest description and crop damage Microscopic eriophyid mites that feed on and within leaf and flower buds and catkins. Buds swell to large size before they die and fall off. Bud mites are more of a problem in some legacy hazelnut varieties, especially Ennis, Willamette, Daviana and Royal. The OSU hazelnut breeding program selects against bud mites so blasted buds are less common in recent cultivar releases. Infested buds do not produce nuts and can cause vegetative growth abnormalities.

Pest monitoring Time sprays to intercept mites as they migrate from blasted buds to new buds in early spring. Monitoring is accomplished by placing double-sided sticky tape or tacky insect glue on branches below blasted buds and counting trapped mites under magnification at regular intervals. Timing sprays for peak mite migration is most effective. Eriophyid mite populations can be controlled by predatory mites and mite flaring may be linked to use of broad-spectrum insecticides and loss of biological control. Most materials labeled for bud mite cannot be applied by air.

Management-biological control

Releases of predatory mites (Galendromus spp.) may have efficacy against these mites.

Management-chemical control: HOME USE

No products are registered for home use for this pest.

Management-chemical control: COMMERCIAL USE

  • abamectin (Abamex) at 10 to 20 oz/ac. REI 12 hr. Do not exceed two applications per season. May have low efficacy.
  • calcium polysulfide (Sulforix) at 3 gal/a. REI 2 days.
  • lime-sulfur (BSP) at 12 gal/a. REI 2 days.
  • pyridaben (Nexter) at 2.67 oz/100 gal water (10.67 oz/a). PHI 7 days. Do not exceed two applications per season. May have low efficacy.
  • spirodiclofen (Envidor 2SC) at 16 to 18 fl oz/a. PHI 7 days. REI 12 hr. May have low efficacy.
  • fenpyroximate (Fujimite XLO) at 2 to 4 pints/a. PHI 14 days. REI 12 hr.