Cydia glandicolana

Status

EXOTIC

PORT INTERCEPT

Taxonomy

Cydia glandicolana (Danilevsky) (Tortricidae: Olethreutinae: Grapholitini)

Adult Recognition

FWL: 6.5–10.0 mm

Forewings are gray-brown, darker basally, with a conspicuous subtriangular dorsal patch next to the ocellus. Numerous rows of pale, paired costal strigulae are present. Hindwings are grayish brown.

Male genitalia are characterized by the absence of an uncus; large, distally rounded valvae; and a thin, wispy phallus. Female genitalia are characterized by a short ductus bursae and a large, globose corpus bursae with a pair of small, tack-like signa.

Larval Morphology

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.] and 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..

Mature larva approximately 17 mm in length; head light brown; prothoracic and anal shields reddish yellow; body whitish, with orange‑to‑red, suffused, longitudinal stripes, pinacula orange to red; SV group on A1, 2, 7, 8, 9 numbering 3:3:2:1:1; anal fork absent.

Detailed figures of larval chaetotaxy are available in Komai and Ishikawa (1987)Komai and Ishikawa (1987):
Komai, F., Ishikawa, K. 1987. Infestation of chestnut fruits in China with two species of the genus Cydia (Lepidoptera, Tortricidae). Japanese Journal of Applied Entomology and Zoology. 31: 55–62 [In Japanese]..

Similar Species

Other similar species include Cydia splendana and C. kurokoi. A dark patch surrounds the ocellus on the distal one-third of the forewing in both of these species. A genitalic dissection can be used to confirm identity.

Other tortricid Castanea pests include C. fagiglandana, 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. Cydia glandicolana larvae can be distinguished by the following characters: reddish abdomen with inconspicuous pinacula; D2 pinacula fused to each other on A9; distance between V setae on A9 greater than on A8; 19–26 crochets on abdominal prolegs; anal comb absent.

Distribution

Cydia glandicolana is distributed throughout east Asia, with records from China, Korea, Japan, and southeastern Russia.

Biology

The following account is summarized from Komai and Ishikawa (1987)Komai and Ishikawa (1987):
Komai, F., Ishikawa, K. 1987. Infestation of chestnut fruits in China with two species of the genus Cydia (Lepidoptera, Tortricidae). Japanese Journal of Applied Entomology and Zoology. 31: 55-62 [in Japanese]..

Cydia glandicolana completes one generation per year. Adults are present July through September. Larvae feed within chestnuts (Castanea spp.) and acorns (Quercus spp.). Overwintering occurs in leaf litter as a late instar.

This species is a pest of chestnut in China. In Japan it has only been recorded feeding on oak.

Plant Associations

View full screen host table here