DRAFT SUBJECT TO COMMENT BY 24th AUGUST 2026

Orchidophilus is a genus of weevils (Family: Curculionidae; Subfamily: Baridinae) that currently contains 6 species: O. aterrimus, O. epidendri, O. eburifer, O. insidiosus, O. peregrinator, and O. ran. They feed and develop on species of orchids primarily in the subfamily Epidendroideae. They are native to southeast Asia and species such as O. aterrimus and O. peregrinator have spread to other countries such as Australia and Hawaii.

These pests develop by feeding of orchid plants, where immature stages are often found tunnelling within the pseudobulb of the orchid. Adults will also continuously feed on all parts of the plant, including flowers, leaves, the pseudobulb, and exposed roots. Feeding can lead to necrotic spots, reduction in flower production and quality, host weakening and, in severe cases, plant death. 

The pathways assessed for this pest group were plants for planting of orchids and cut flowers, foliage and branches of orchids, which were rated as unlikely and very unlikely, respectively. The association of these species with orchid plants is likely and there is strong evidence of pest movement with trade. However, the volume of trade from countries with pest presence is small and the likelihood of transfer to an area capable of sustaining a population is thought to be low. 

Due to the pest’s current distribution in tropical countries, the UK climate is unlikely to support development. It is unknown whether native UK orchid species would be suitable hosts, as they lack the pseudobulb which is the preferred oviposition/development site. Therefore, outdoor establishment is rated as unlikely. 

There are many sites within the UK that could sustain a population of orchid weevils such as botanical gardens, national plant collections, and specialist growers/retailers. These sites would contain suitable orchid species and conditions suitable for pest development. Establishment under protection is therefore rated as likely. However, many of these sites, especially botanical gardens and plant collections, would quarantine any new material and require inspections prior to movement, potentially limiting pest entry. 

Damage caused by orchid weevils, such as necrosis or flower streaking, is likely to result in a loss of marketable plants or flowers. This is likely to affect nurseries, garden centres, wholesalers and private sellers. Economic impact is also likely from the methods used to control the weevil. Previous cases of control involved destruction of orchid plants and extended pesticide spray programmes, which would be costly. However, due to the relatively small size of the orchid industry in the UK and the limited damage reported from these pest species, the economic impact in the UK is rated as small.

 Due to the pest’s size and life strategy, if a population became established, containment and eradication would be difficult. Continued exclusion is therefore the preferred management option. In the case of establishment, sanitation (destruction of plants) and insecticides are the most effective control methods.