Eriophyidae: the gall mites — tiny plant parasites

Characteristics and anatomy

Adults are extremely small (typically about 0.08–0.3 mm) and can be difficult to see without magnification. Their body is elongate with a simple, straight digestive tract and no obvious gut diverticula. They lack a distinct heart or conventional circulatory system, and their mouthparts are adapted to pierce and suck plant cells. For more on their structure, see detailed anatomy resources.

Life cycle and behavior

Eriophyid mites have a direct life cycle with egg, nymphal, and adult stages; development can be rapid under warm conditions, leading to population explosions. Most species are highly host-specific, completing their life cycle on a single plant species or closely related hosts. They disperse slowly by crawling but can be carried long distances by wind, human movement of plant material, or on insects.

Plant interactions and impacts

Feeding by eriophyids stimulates abnormal plant growths (galls) or subtle symptoms such as bronzing, stippling, or leaf curling. Some species reduce vigor and yield, deform ornamental plants, or render fruit unmarketable. A number of eriophyid mites are also vectors of plant viruses, which can amplify their economic importance.

Management and significance

• Identification and monitoring with magnification or trapping
• Use of resistant cultivars where available
• Cultural controls: removing infested material and avoiding plant stress
• Chemical controls: targeted miticides when thresholds are exceeded
• Biological control: predatory mites and natural enemies in integrated programs

Practitioners can find practical guidance on control and management in extension literature and pest management guides; consult management strategies for region-specific advice. Eriophyids are a distinct and specialized group of mites whose subtle appearance belies their often large effects on cultivated and wild plants.