Thyrinteina arnobia

Eucalyptus plantations in subtropical and tropical Brazil; native environments in tropical and subtropical areas including Atlantic Forest, Cerrado, and transition zones between Atlantic Forest and Southern Cerrado

Native to the Americas; present throughout nearly all of South America and parts of Central and North America; in Brazil occurs across the Atlantic Forest, transition zones between Atlantic Forest and Southern Cerrado, and Northern Cerrado biomes; potential suitable areas predicted in Africa, Asia, and Oceania

Feeds primarily on members of the family Myrtaceae; Eucalyptus species serve as the primary host in plantation settings; several native Myrtaceae species also serve as hosts

• Eucalyptus - primary host in plantationsvulnerable host; commercial plantations drive population expansion
• native Myrtaceae species - native hostsseveral native species utilized with preference for Myrtaceae family

Larvae develop through multiple instars; fifth-instar larvae have been used for midgut dissection in toxicology studies; neonate to second-instar molting used as developmental endpoint in 7-day laboratory bioassays

Primary defoliator of Eucalyptus crops causing severe defoliation; population outbreaks associated with local or regional populations with low frequency of movement among regions or biomes; demographic and spatial expansion has been associated with the historical expansion of Eucalyptus plantations over the last 100 years; larvae lack coordinated movements when affected by toxins

Agricultural and forestry pest; can reduce Eucalyptus annual biomass production by up to 40%; population dynamics driven by commercial plantation expansion

Major economic pest of Brazilian Eucalyptus plantations; subject of transgenic control research including development of Bt Eucalyptus events expressing Cry1Ab, Cry2Aa, and Cry1Bb proteins; genetic studies conducted to understand population structure and inform management strategies

• pest
• defoliator
• Eucalyptus
• Myrtaceae
• Geometridae
• Brazil
• plantation
• transgenic control
• population genetics

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Pyramiding of cry genes in high-dose transgenic eucalyptus provides control of Thyrinteina arnobia (Lepidoptera: Geometridae) and reduces the risk of resistance.
• Genetic diversity, population structure and ecological niche modeling of Thyrinteina arnobia (Lepidoptera: Geometridae), a native Eucalyptus pest in Brazil.