Apple Malus domestica Borkh., 1803 (Rosales: Rosaceae), is a crop of strategic importance for Chile, of which 90% of its cultivated areas are concentrated in the Maule and O'Higgins Regions, but what is produced in other parts of the country are mostly backyard or marginal crops. During tours carried out in the city of Osorno, Los Lagos Region (40°34’25” S 73°08’43” W), severely defoliated apple trees were observed, so the aim of the study was to identify the insect species associated with them. A photographic record was made to observe morphological characteristics of the insects and specialized literature was consulted. According to the results, the defoliating insects correspond to larvae of Orgyia antiqua (L., 1758) (Lepidoptera: Erebidae), in addition to the predator Harmonia axyridis (Pallas, 1773) (Coleoptera: Coccinellidae); both exotic feral/naturalized species, with continuous distribution from the Coquimbo Region to the Los Lagos Region, Chile.
