Global-invasive
Guides
Leptocybe
blue gum chalcid wasp, eucalyptus gall wasp
Leptocybe is a monotypic genus of gall wasps in the family Eulophidae, containing the single species L. invasa. Native to Queensland, Australia, this genus has become globally significant as an invasive pest of Eucalyptus plantations. The wasp induces spherical galls on leaf buds and young tissues of multiple Eucalyptus species, causing substantial economic damage to forestry operations worldwide. The genus is characterized by extremely small body size, thelytokous parthenogenetic reproduction, and rapid population expansion in introduced ranges.
Phoracantha semipunctata
Australian Eucalyptus longhorn, Common Eucalyptus Longhorn, eucalyptus longhorned borer, firewood beetle
Phoracantha semipunctata is a wood-boring beetle in the family Cerambycidae, native to Australia and invasive in many regions where Eucalyptus has been introduced. Adults are crepuscular, active during warmer evening hours when temperatures exceed 15°C. Females lay eggs under loose bark or in bark crevices of stressed or freshly cut Eucalyptus trees; larvae bore into phloem and sapwood, potentially girdling and killing trees. The species is a significant pest in plantations outside Australia, though outbreaks in its native range are associated with drought-stressed trees.
Plutella xylostella
diamondback moth, cabbage moth
Plutella xylostella is a globally distributed moth species and one of the most economically significant agricultural pests worldwide. The small grayish-brown moth derives its common name from the cream-colored band that forms a diamond pattern along its back. Its larvae feed exclusively on cruciferous plants, causing extensive damage to cabbage, broccoli, cauliflower, canola, and other Brassica crops. The species has evolved resistance to nearly every class of insecticide, including Bacillus thuringiensis toxins, making it exceptionally difficult to control. Annual global management costs are estimated at $4–5 billion.