Aculus schlechtendali

Definition

A species of eriophyid mite (family Eriophyidae, order Trombidiformes) that induces rust mite or apple rust mite damage on rosaceous fruit trees, particularly apple (Malus domestica). Adults are microscopic, worm-shaped, and possess only two pairs of legs—diagnostic for Eriophyoidea. Feing causes bronzing or silvering of leaves and fruit, reducing photosynthetic capacity and marketable crop quality. Formerly placed in genus Phyllocoptes; the species epithet honors German botanist Heinrich von Schlechtendal.

Etymology

Aculus: Latin diminutive of acus 'needle', referring to slender body form; schlechtendali: patronym honoring Heinrich von Schlechtendal (1793–1864), German botanist and entomologist who described many gall mites

Example

Populations of Aculus schlechtendali typically peak in late summer on apple, with overwintering females seeking bud scales; integrated management relies on predatory mites such as Typhlodromus pyri rather than broad-spectrum acaricides that disrupt biological control.

Synonyms

• Phyllocoptes schlechtendali

Related Terms

• Eriophyidae
• Trombidiformes
• gall mite
• rust mite
• acarology
• Integrated Pest Management
• Typhlodromus pyri
• Malus domestica

Usage Notes

The epithet is often misspelled 'schlechtendahli' in older literature. Distinguish from Aculus fockeui (plum rust mite) and other Aculus species by host association and subtle morphological differences in the shield pattern and microtuberculation of the opisthosoma. In agricultural contexts, abbreviated as 'AS' in IPM scouting protocols.