Poplar Budgall Mite

    Poplar Budgall Mite

    Eriophyes parapopuli

    poplar budgall mites

    Galls produced by poplar budgall mites (Whitney Cranshaw, Colorado State University, Bugwood.org)

    poplar budgall mites

    Galls produced by poplar budgall mites (Whitney Cranshaw, Colorado State University, Bugwood.org)

     

    Pest Description

    • minute, four-legged, cigar-shaped mite; opaque white to yellow in color
    • microscope or hand lens required to see mites; use symptoms for identification

    Host Plants, Diet & Damage

    • cottonwood
    • galls are woody and cauliflower-like; typically found on one side of the branch
    • galls remain on tree year to year and are unsightly
    • galls can reduce leaf production and kill branches

    Biology, Life Cycle & Damaging Life Stage

    • overwinter primarily in galls, and less frequently in buds
    • migration of mites from galls to new buds occurs May through August
    • galls may harbor mites for up to 4 years
    • immatures and adults are damaging

    IPM Recommendations

    • Damage is primarily aesthetic; tolerate pest.
    • Plant resistant poplar varieties.
    • Prune galls or heavily infested branches out of trees in early spring during dormancy.
    • Apply horticultural oils at budbreak to target migrating mites.
    • Apply an insecticide (avermectin; carbamate; METI acaracide; insecticidal soap; lime sulfur; tetronic and tetramic acid derivatives) at or just prior to budbreak.
    • Do not use horticultural oils in combination with, or within 30 days of applying sulfur or a sulfur-containing product.

    For more information, see our Poplar Bud Gall Mite fact sheet or our Eriophyid Mites fact sheet.