Cydia fagiglandana (Zeller) (Tortricidae: Olethreutinae: Grapholitini)
Synonyms: grossana (Tortrix )
Subspecies: corsica (Corsica, France)
FWL: 6.0–9.5 mm
Adults are brownish gray with numerous white markings. A subtriangular dark patch is present proximal to the poorly defined ocellus. Males have a whitish-gray patch of sex scales on the dark brown hindwings.
Male genitalia are characterized by the absence of an uncus; distally rounded valvae with a large basal cavity; and a thin, curved phallus. Female genitalia are characterized by a poorly sclerotized sterigma and two tack-like signa in the corpus bursae.
The following account is summarized from Swatschek (1958)Swatschek (1958):
Swatschek, B. 1958. Die larval systematik der wickler (Tortricidae und Carposinidae) aus dem zoologischen Institut der Universitat Erlangen. Akademie-Verlag, Berlin. 269 pp. [Abhandlungen zur larvalsystematik Insekten 3.].
Mature larva approximately 14 mm in length; head orange-brown; prothoracic shield pale reddish yellow; body whitish but often heavily suffused with orange, red, or pink; pinacula orange to red; anal fork absent.
Similar species include Cydia splendana in Europe and C. kurokoi in Asia, although both are generally lighter gray in color and have a large subtriangular patch surrounding the ocellus on the distal one-third of the forewing.
Other tortricid Castanea pests include Cydia glandicolana, C. kurokoi, C. splendana, Fibuloides aestuosa, and Pammene fasciana. Brown and Komai (2008)Brown and Komai (2008):
Brown, J. W., Komai, F. 2008. Key to larvae of Castanea -feeding Olethreutinae frequently intercepted at U.S. ports-of-entry (Lepidoptera : Tortricidae). Tropical Lepidoptera Research. 18(1): 2-4. provide a description and key to larvae of these species. C. fagiglandana larvae can be distinguished by the following characters: abdomen reddish white with orange to red pinacula; distance between V setae on A9 usually the same as on A8; more than 18 crochets on abdominal prolegs; anal comb absent.
Cydia fagiglandana occurs from Europe east to Northern Iran and central Asia.
The following account is summarized from Arahou (1994)Arahou (1994):
Arahou, M. 1994. Biologie et degats de Curculio glandium Marsham, 1802 (Coletoptera, Curculinionidae) et de Cydia fagiglandana Zeller, 1841 (Lepidoptera, Tortricidae), deux ravegeurs des glands du chene vert dans la Moyen-Atlas marocain. Entomologiste (Paris) 50(4): 253-259. and Jiménez et al. (2006)Jiménez et al. (2006):
Jiménez, A., Soria, F.J., Villagrán, M., Ocete, M.E. 2006. Seguimiento del ciclo biólogico de Cydia fagiglandana (Zeller) (Lepidoptera: Tortricidae) en un encinar del sur de España. Boletin de Sanidad Vegetal. 32: 157-168..
Cydia fagiglandana completes a single generation per year. Adults are present from May to October, depending on location.
On chestnut (Castanea spp.), females deposit eggs near the fruits. Larvae bore into the fruit and consume the seeds. Larvae may complete development within a single fruit or move to other fruits in host species with small seeds. Overwintering occurs as a late instar larva. Pupation occurs in the spring.
Larvae are a common pest of beech (Fagus sylvatica), chestnut (Castanea spp.), and oak (Quercus spp.).
Authors: KA Austin, TM Gilligan, ME Epstein
Content last updated May 2025
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