FWL: 6.5-10.0 mm
Forewings are gray, darker basally, with a subtriangular dorsal patch proximal to the ocellus. Hindwings are grayish brown.
Other similar species include Cydia splendana and Cydia 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.
Late instar larvae are approximately 17 mm in length. The abdomen is yellowish red with concolorous inconspicuous pinacula. The head is yellowish brown and the prothoracic shield is pale yellow brown with mottling along the posterior margin. An anal comb is absent.
Other tortricid Castanea pests include Cydia fagiglandana, Cydia kurokoi, Cydia splendana, Fibuloides aestuosa, and Pammene fasciana. Brown and Komai (2008) 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.
Cydia glandicolana completes one generation per year. Adults are present July through September.
Larvae feed within chestnuts and acorns. 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.
|Family ||Genus/species ||Common name|
|Fagaceae ||Castanea mollissima Blume ||Chinese chestnut|
|Fagaceae ||Castanea Mill. ||chestnut|
|Fagaceae ||Quercus dentata Thunb. ||Daimyo oak|
|Fagaceae ||Quercus mongolica Fisch. ex Ledeb. ||mongolian oak|
|Fagaceae ||Quercus serrata Thunb. ||bao li|
|Fagaceae ||Quercus sp. ||oak|
Cydia glandicolana is distributed throughout China, Korea, and Japan. There are also records from southeastern Russia.
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.
Komai, F. and K. Ishikawa. 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]
Meijerman, L. and S. A. Ulenberg. 2000. Arthropods of Economic Importance: Eurasian Tortricidae. Arthropods of Economic Importance series. ETI/ZMA.