SAG detects viable eggs of dangerous forest pest on ship arriving at the port of Huasco

The Agricultural and Livestock Service (SAG) of Atacama detected viable eggs of the spongy moth (Lymantria dispar) attached to the structure of a cargo ship that arrived at the port of Huasco. The presence of this pest raised health alerts due to its ability to damage a wide variety of plant species.

After the finding, the eggs were subjected to analysis in specialized laboratories, which confirmed their identification. As a preventive measure, a phytosanitary treatment was ordered to eliminate the immature stages of the insect and prevent its eventual establishment in national territory.

The regional director (s) of SAG, José Herrera Iglesias, highlighted the relevance of the detection, considering that this species can feed on forest, fruit, and ornamental trees and shrubs, even consuming their foliage completely.

The authority also praised the work of the officials who identified the egg masses through the application of technical inspection and phytosanitary surveillance protocols.

Risk of entry by sea

SAG explained that vessels coming from abroad represent a possible entry route for this pest, especially those from Asian countries, where the species is present.

Moths are attracted by the lights of large cargo ships, which makes it easier for them to lay their eggs on different parts of the vessels. For this reason, inspecting their structures is a key tool for timely detection of organisms that could threaten Chile's agricultural and forest heritage.

The spongy moth stands out for its ability to feed on more than 500 species of trees and shrubs. Its establishment could cause damage to forests, plantations, fruit trees, and green areas, due to the loss of foliage caused by its larvae.

Third detection in ports of Atacama

The finding in Huasco corresponds to the third detection of viable eggs ofLymantria disparin ports of the Atacama Region. Previous records were registered in 2025, at the port of Barquito, and in 2020, also in Huasco.

To prevent new cases, SAG maintains inspections of foreign vessels that dock for the first time in ports of the region. The controls include decks, holds, garbage containers, and other exposed areas where eggs or other developmental stages of the pest could be found.

In addition, the agency evaluates the phytosanitary risk of each vessel according to its origin and the ports where it has remained during the last 24 months.

These measures seek to strengthen border surveillance and prevent the entry of exotic species capable of causing damage to the country's forest, agricultural, and ornamental resources.