St. Croix locked down over invasive fruit fly threat

A phytosanitary emergency is now in effect across St. Croix, with authorities banning the transport of fresh fruits, vegetables and host plants off the island following the discovery of Mediterranean fruit flies at multiple sites.

The quarantine became active immediately after the V.I. Department of Agriculture's announcement on Thursday. Travelers entering the US Virgin Islands from abroad have been advised to declare all agricultural items to U.S. customs officials.

Since March 2026, the invasive pest has been found at locations ranging from Tamarind Reef in the east to the Princess area in the central region. The Mediterranean fruit fly, or Medfly, poses a significant threat to agriculture: it can damage more than 250 fruit and vegetable species grown locally, including mangoes, guavas, avocados, soursop, sugar apples, breadfruit, genips, papayas, carambola, citrus, bananas, watermelon, peppers and tomatoes.

The pest reproduces by laying eggs inside fruit. Once the eggs hatch, larvae consume the fruit's interior, causing decay and premature dropping from trees. Left unchecked, an infestation could substantially harm crop yields, reduce local food production and damage livelihoods for farmers and home gardeners, the Department of Agriculture cautioned.

A joint surveillance effort between the V.I. Department of Agriculture and the USDA's Animal and Plant Health Inspection Service (APHIS) identified the flies. The department is now coordinating response efforts with APHIS, the Department of Planning and Natural Resources and the Territorial Emergency Management Agency. Officials have formally requested that APHIS activate the Incident Command System to oversee the multi-agency effort.

As the response intensifies, St. Croix residents will see more agricultural inspectors from local and federal agencies. Authorities plan to deploy additional monitoring traps strategically across the island and expand inspection activities to assess the full scope of the infestation and prevent the pest from establishing itself permanently.

The Department of Agriculture is urging residents to work with surveillance teams and maintain strict compliance with quarantine rules. The emergency order remains in place indefinitely, with the goal of containing and eliminating the Mediterranean fruit fly before it becomes entrenched in the territory.