Gypsonoma aceriana

Distinguished from similar Gypsonoma species by the combination of ochreous-whitish forewings with pale brownish suffusion posteriorly, the obtusely angulated edge of the fuscous basal patch, and the ill-defined, dorsally interrupted central fascia with a small blackish discal mark. The specific association with poplar and maple hosts aids identification where host data are available. The grey hindwings contrast with the patterned forewings.

Poplar plantations and nurseries; ornamental poplar trees in urban areas. Associated with stands of Populus nigra, P. nigra subsp. italica, P. alba, and P. balsamifera, as well as maple species Acer platanoides and A. campestre.

Europe through Russia, extending to eastern Turkey, Iraq, and North Africa. Introduced to Japan. Recorded from Belgium, Bulgaria (Sofia, Svoge, Vardim, Pazardzhik), France, Germany, Italy, and the Netherlands.

Adults active in July in native range. In Japan, two to three generations occur with adult flight in June, July, and August.

Larvae feed internally on Populus nigra, Populus nigra subsp. italica, Populus alba, Populus balsamifera, Acer platanoides, and Acer campestre. Older larvae (third instars) bore into buds and below terminal shoots.

• Populus nigra - larval food plantprimary host
• Populus nigra subsp. italica - larval food plantprimary host
• Populus alba - larval food plantprimary host
• Populus balsamifera - larval food plantprimary host
• Acer platanoides - larval food plantsecondary host
• Acer campestre - larval food plantsecondary host
• Bracon variator - parasitoidectoparasitic, attacks young larvae
• Orgilus obscurator - parasitoidendoparasitic
• Microdus tumidulus - parasitoidendoparasitic, dominant species (41.0% of parasitism)
• Apanteles erevanicus - parasitoidendoparasitic, dominant species (30.6% of parasitism)
• Pristomerus rufiabdominalis - parasitoidendoparasitic
• Pristomerus vulnerator - parasitoidendoparasitic
• Bassus tumidulus - parasitoidsolitary internal parasitoid, attacks first–second instars, two generations

Complete metamorphosis with larval development inside host plant shoots. Larvae progress through at least three instars; older larvae (third instars) bore into buds and subterminal shoot tissue. Overwintering stage not explicitly documented in sources. In Japan, two to three generations per year occur.

Larvae are shoot-borers that destroy terminal shoots, inducing bushy lateral growth. Parasitoid emergence is synchronized with host adult emergence; Bassus tumidulus shows relatively good synchrony with first larval generation but poorer synchrony with second generation.

Herbivore that damages poplar and maple shoots. Serves as host for diverse larval parasitoid complex (Braconidae and Ichneumonidae) that provides natural biological control, with parasitism rates reaching 5.9–61.5% across generations.

Economic pest of poplar plantations and nurseries in Europe, causing unmarketable growth in young trees through terminal shoot destruction. Recorded as a pest from Italy, France, Germany, and the Netherlands. Subject to biological control research focusing on parasitoid augmentation.

• Gypsonoma dealbanaSimilar size and wing pattern, but G. aceriana distinguished by host association with poplar and maple, and specific forewing pattern elements including the obtusely angulated basal patch edge
• Gypsonoma minutanaOverlapping distribution and habitat; G. aceriana differs in forewing coloration (ochreous-whitish with brownish suffusion versus more uniform greyish tones in some congeners) and confirmed host plant range

• pest
• shoot borer
• poplar
• maple
• Tortricidae
• biological control
• parasitoid host

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Species composition, structure and impact of larval parasitoids of poplar twig borer,Gypsonoma aceriana (Dup.) (Lepidoptera, Tortricidae), on poplar ornamental trees in Sofia
• Bioecological characteristics of Bassus tumidulus (Nees) (Hym., Braconidae), a parasitoid of the poplar twig borer, Gypsonoma aceriana (Dup.) (Lep., Tortricidae) in Bulgaria