Cydia kurokoi

Status

EXOTIC

PORT INTERCEPT

Taxonomy

Cydia kurokoi (Amsel) (Tortricidae: Olethreutinae: Grapholitini)

Adult Recognition

FWL: approx. 10 mm

Forewings are light gray and brown. The distal one-third of the wing is marked with a dark-brown to black subtriangular patch that surrounds the ocellus. Hindwings are grayish brown.

Male genitalia are characterized by the absence of an uncus and socii; and distally rounded valve with a well-developed cucullus. Female genitalia are characterized by a sclerotized basal portion of the ductus bursae and two small, tack-like signa in the corpus bursae.

Larval Morphology

The following account is summarized from 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 with head yellowish brown; prothoracic, anal shields pale yellowish brown; body whitish, with conspicuous, darker pinacula; SV group on A1, 2, 7, 8, 9 numbering 3:3:2:1:1; anal fork absent.

See 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]. for detailed figures of larval chaetotaxy.

Similar Species

Adults may appear similar to other species of Cydia, including C. pomonella and C. splendana. A dissection can be used to confirm identity.

Other tortricid Castanea pests include C. fagiglandana, C. glandicolana, C. splendana, Fibuloides aestuosa, and Pammene fasciana. Brown and Komai (2008) provide a description and key to larvae of these species. Cydia kurokoi larvae can be distinguished by the following characters: whitish abdomen with darker pinacula; D2 pinacula fused to each other on A9; all three L setae on same pinaculum on A9; distance between V setae on A9 greater than on A8; 25–35 crochets on abdominal prolegs; anal comb absent.

Distribution

Cydia kurokoi occurs in China, Korea, and Japan.

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 kurokoi completes one generation per year. Adults are present in August and September. Larvae tunnel into and feed inside chestnuts (Castanea spp.). Overwintering occurs in leaf litter as a late instar.

This species is a pest of chestnuts in Japan. Larvae have also been recorded on oak (Quercus spp.).

Plant Associations

View full screen host table here