Aculops alachuae

Systematic position: Aculops alachuae belongs to the Eriophyidae family, within the order Trombidiformes. These are microscopic mites that are highly host-specific, making them difficult to detect without professional diagnostic tools or a strong magnifying lens.

Host plants: This pest primarily targets plants within the Acanthaceae family. It is particularly known for infesting various species of the Ruellia genus, which are popular ornamental plants in many tropical and subtropical regions around the world.

Biology and life cycle: The entire life cycle of this mite takes place on the host plant. They thrive in warm, humid environments, which accelerate their reproductive rate. Due to their small size, they can easily spread via wind, equipment, or contact between infected and healthy plants.

Damage and harmfulness: The mite feeds on plant cells, causing noticeable physiological changes. Typical symptoms include the formation of erineum (hair-like galls), leaf curling, stunted growth, and the development of distorted, "witches' broom" style shoots that significantly reduce the plant's ornamental value.

Control measures: Managing an infestation requires a proactive strategy focused on integrated pest management:

• Regular inspection of Ruellia populations, especially new arrivals.
• Quarantining infected plants to prevent the spread to the rest of the collection.
• Application of systemic or contact acaricides registered for eriophyid mites.
• Pruning and safe disposal of heavily infested plant parts to reduce the initial mite population.