Poplar Budgall Mite

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A. parapopuli
Scientific Name
Aceria parapopuli
(Keifer, 1940)
Scientific Name Synonyms
Eriophyes parapopuli
Common Names
poplar budgall mite

Compiled by Whitney Cranshaw, Colorado State University:

Eriophyes parapopuli (Keifer)
Acarina: Eriophyidae


Cottonwood, particularly the variety 'Siouxland'

Damage and Diagnosis

Poplar budgall mites produce large, corky, irregularly shaped galls around the buds of poplars. Since infested buds do not produce leaves, the tree can have a thin, spindly appearance following repeated heavy attacks. The knobby galls also detract from appearance of the tree.

Life History and Habits

Biology of this mite is not well known. The mites overwinter primarily within the galls produced the previous season, as well as in protected areas around buds. In spring feeding within the old galls continues and mites begin to move to and feed on the new buds. As the buds develop, they become distorted and cover the mites. Reproduction appears to occur throughout the growing season.

There are two nymphal stages plus the adult stage. Ten to 14 days are required to complete one generation.


Predator mites are commonly associated with poplar budgall mites and presumably are important natural controls. Hard winters, which can kill the galled tissues, also appear important in limiting populations. Serious infestations rarely are sustained for long due to these natural controls.

Chemical control is difficult. The mites emerge from the galls over an extended period so repeat applications would be necessary to maintain adequate control. If attempted, sprays should be initiated before bud break. Dormant oil sprays may control mites and mite eggs near bud scales, but fail to sufficiently penetrate old galls.

The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality.