Hairy mite

The hairy mite (Aculus comatus) is a member of the Arachnida class, order Acariformes, and the family Eriophyidae, commonly known as four-legged mites. These microscopic pests are highly specialized, often causing significant damage to the foliage and buds of their host plants through intensive sap-feeding.

This species primarily targets plants within the Rosaceae family, with a particular affinity for the Rubus genus, such as blackberries. By occupying the leaf surfaces, the mites disrupt the vital functions of the plant, leading to localized physiological stress that can affect the overall health of the entire crop.

The biology of Aculus comatus is characterized by a rapid life cycle. Overwintering occurs in protected sites like dormant buds or bark crevices. As soon as temperatures rise in the spring, the mites emerge to infest new growth. Their ability to produce multiple generations throughout the growing season makes them a persistent threat if not monitored properly.

The damage caused by the hairy mite is primarily manifest as leaf curling, distortion, and the formation of characteristic galls or felt-like structures on the underside of leaves. This infestation significantly impairs the plant's photosynthetic capacity, resulting in stunted shoot development and a substantial reduction in fruit yield or plant aesthetic quality.

Effective control measures require a strategic approach, focusing on early intervention. Growers should use targeted acaricides during the early spring bud-burst phase to suppress the initial population.

• Regular pruning and removal of infested plant material.
• Monitoring for early symptoms of leaf curling.
• Application of specialized mite-control chemicals.
• Maintaining optimal plant nutrition to support recovery.