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Thyrinteina arnobia
eucalyptus brown looper, brown looper caterpillar
Thyrinteina arnobia is a geometrid moth native to the Americas and a major pest of Eucalyptus plantations in Brazil. The species occurs throughout South America and parts of Central and North America, where it feeds primarily on Myrtaceae, with Eucalyptus serving as a vulnerable host in commercial plantations. Larval infestations can reduce annual Eucalyptus biomass production by up to 40%, making it the primary defoliator of subtropical and tropical Brazilian eucalyptus farms. Population genetic studies indicate low genetic diversity in Brazil with three regional mitochondrial haplogroups, suggesting outbreaks arise from local populations rather than long-distance dispersal.