Pest categorisation of Oligonychus perseae

Area of Science:

• Plant Health
• Entomology
• Pest Risk Analysis

Background:

• Oligonychus perseae, the persea mite, is a tropical pest originating from Mesoamerica.
• It has spread to various regions globally, including southern Europe (Italy, Portugal, Spain) within the EU.
• The mite is polyphagous, with a significant impact on avocado (Persea americana) cultivation.

Purpose of the Study:

• To conduct a pest categorisation of Oligonychus perseae for the European Union (EU).
• To assess the risk posed by O. perseae to avocado production and organic farming practices in the EU.
• To determine if O. perseae meets the criteria for a potential Union quarantine pest.

Main Methods:

• Review of existing scientific literature and data on O. perseae.
• Analysis of its biology, host range, distribution, and economic impact.
• Assessment of potential pathways for entry and spread within the EU.
• Evaluation against EU plant health regulations and pest categorisation criteria.

Main Results:

• O. perseae is established in Italy, Portugal, and Spain, with potential for spread to other EU Member States.
• It primarily affects avocado leaves, causing defoliation and indirect fruit damage (sunburn) under water stress conditions.
• The mite's presence threatens organic avocado production by potentially requiring pesticide applications.
• Human-assisted movement, particularly via plants for planting, is a key pathway for long-distance spread.

Conclusions:

• Oligonychus perseae satisfies the criteria to be considered a potential Union quarantine pest.
• Phytosanitary measures are recommended to mitigate the risk of further entry and spread.
• The pest poses a significant threat to the EU avocado industry, especially organic production.