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Port Interception Target - Larva

Cydia fagiglandana (Zeller) (Tortricidae: Olethreutinae: Grapholitini)

Synonyms: grossana (Tortrix)

Subspecies: corsica (Corsica, France)

Fig. 1: Male

Fig. 1: Male

Fig. 2: Male

Fig. 2: Male

Fig. 3: Female

Fig. 3: Female

Fig. 4: Male genitalia

Fig. 4: Male genitalia

Fig. 5: Female genitalia

Fig. 5: Female genitalia

Fig. 6: Larva

Fig. 6: Larva

Adult Recognition

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.

Similar species include Cydia splendana in Europe and Cydia 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.

Larval Morphology

Late instar larvae are approximately 14 mm in length. The abdomen is whitish with orange or red suffused longitudinal stripes. Abdominal pinacula are orange to red. The head is light brown and the prothoracic shield is reddish yellow. An anal comb is absent.

Other tortricid Castanea pests include Cydia glandicolana, Cydia kurokoi, Cydia splendana, Fibuloides aestuosa, and Pammene fasciana. Brown and Komai (2008) provide a description and key to larvae of these species. Cydia 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 completes a single generation per year. Adults are present from May to July.

On chestnut, 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.

Host plants

Larvae are a common pest of beech, chestnut, and oak.

Family Genus/species Common name
Betulaceae Corylus avellana L. common filbert
Fagaceae Castanea Mill. chestnut
Fagaceae Castanea sativa Mill. European chestnut
Fagaceae Fagus sylvatica L. European beech
Fagaceae Quercus ilex L. holly oak
Fagaceae Quercus ilex subsp. rotundifolia (Lam.) Tab. Morais
Fagaceae Quercus L. oak
Fagaceae Quercus suber L. cork oak


Cydia fagiglandana occurs from Europe east to Northern Iran and central Asia.


Bogenschutz, H. 1991. Eurasian species in forestry, pp. 673-709.  In L. P. S. van der Geest and H. H. Evenhius [eds.], Tortricid Pests: Their Biology, Natural Enemies, and Control. World Crop Pests, Vol. 5. Elsevier, Amsterdam.

Bradley, J. D., W. G. Tremewan and A. Smith. 1979. British Tortricoid Moths - Tortricidae: Olethreutinae. The Ray Society, London, England. 336 pp.

Brown, J. W. and 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.

Meijerman, L. and S. A. Ulenberg. 2000. Arthropods of Economic Importance: Eurasian Tortricidae. Arthropods of Economic Importance series. ETI/ZMA.

Razowski, J. 2003. Tortricidae of Europe, Vol. 2, Olethreutinae. Frantisek Slamka, Slovakia. 301 pp.

Photo Credits

Fig. 6: Gyorgy Csoka, Hungary Forest Research Institute,

Tortricids of Agricultural Importance by Todd M. Gilligan and Marc E. Epstein
Interactive Keys developed in Lucid 3.5. Last updated August 2014.