Native
Acleris senescens (Zeller) (Tortricidae: Tortricinae: Tortricini)
FWLFWL:
forewing length; the distance from the base of the forewing to the apex, including fringe
: 10.0-12.5 mm
Adults have elongate, narrow forewings. Several different forms exist, although most have gray forewings with black lines and spots. Males lack a forewing costal foldforewing costal fold:
a flap or fold at the base of the forewing that contains specialized sex scales
.
Male genitalia are characterized by a reduced uncusuncus:
a sclerotized process which is fused to the posterodorsal margin of tergum IX
; moderate, lobe-like sociisocii:
a pair of lightly sclerotized setose lobes
; and elongate valvaevalva:
an appendage flanking the intromittent organ that is used to clasp the female during copulation
with well sclerotizedsclerotized:
hardened; usually in reference to larval structures or adult genitalia 
dorsaldorsal:
upper, to the top, on the back 
and ventralventral:
lower, to the bottom, on the under side
margins and a well-developed apical process. Female genitalia are characterized by sterigmasterigma:
the sclerotized region surrounding the female ostium bursae 
with long anteriorly directed lobes; scobinatescobinate:
rasplike
signum in corpus bursaecorpus bursae:
a dilated membranous sac at the anterior end of the bursa copulatrix
.
The following account is summarized from MacKay (1962a).
Mature larva 14-15 mm in length; width of head 1.4-1.7 mm; head yellowish with darker laterallateral:
to the side
pigmentation; prothoracic shieldprothoracic shield:
a sclerotized plate on the dorsal surface of the prothorax 
, body, legs, and anal shieldanal shield:
a sclerotized plate on the dorsal surface of the last abdominal segment (in larvae) 
pale green; anal fork well developed; SV group on A1, 2, 7, 8, 9 typically 3:3:2:2:2.
The forewing pattern of A. senescens is similar to certain forms of several other Acleris species, such as A. chalybeana and A. hastiana. A genitalic dissection can be used to confirm identity.
Adults are present in early spring and late fall in California, suggesting two generations per year. More detailed life history information for this species is unavailable.
Larvae of A. senescens have been recorded feeding on plants in the Betulaceae, Rosaceae, and Salicaceae.
| Host plant | Host plant family | Reference(s) |
| Alnus rubra | Betulaceae | Prentice 1966Prentice 1966: Prentice, R. M. 1966. Vol. 4. Microlepidoptera. In : Forest Lepidoptera of Canada recorded by the Forest Insect Survey. Dept. For. Canada Publ. 1142: 543-840. |
| Betula sp. | Betulaceae | Powell 1964bPowell 1964b: Powell, J. A. 1964b. Biological and taxonomic studies on tortricine moths, with reference to the species in California. University of California Publications in Entomology. Vol. 32. 317 pp. |
| Malus sp. | Rosaceae | Prentice 1966Prentice 1966: Prentice, R. M. 1966. Vol. 4. Microlepidoptera. In : Forest Lepidoptera of Canada recorded by the Forest Insect Survey. Dept. For. Canada Publ. 1142: 543-840. |
| Populus tremuloides | Salicaceae | Prentice 1966Prentice 1966: Prentice, R. M. 1966. Vol. 4. Microlepidoptera. In : Forest Lepidoptera of Canada recorded by the Forest Insect Survey. Dept. For. Canada Publ. 1142: 543-840. |
| Prunus virginiana | Rosaceae | Powell 2006Powell 2006: Powell, J. A. 2006. Database of Lepidoptera rearing lots, 1960-2005. University of California Berkeley, CA. |
| Salix hookeriana | Salicaceae | Powell 2006Powell 2006: Powell, J. A. 2006. Database of Lepidoptera rearing lots, 1960-2005. University of California Berkeley, CA. |
| Salix lasiolepis | Salicaceae | De Benedictis et al. 1990De Benedictis et al. 1990: De Benedictis, J. A., Wagner, D. L., Whitfield, J. B. 1990. Larval hosts of Microlepidoptera of the San Bruno Mountains, California. Atala. 16: 14-35.; Powell 2006Powell 2006: Powell, J. A. 2006. Database of Lepidoptera rearing lots, 1960-2005. University of California Berkeley, CA. |
| Salix sp. | Salicaceae | Prentice 1966Prentice 1966: Prentice, R. M. 1966. Vol. 4. Microlepidoptera. In : Forest Lepidoptera of Canada recorded by the Forest Insect Survey. Dept. For. Canada Publ. 1142: 543-840.; Powell 1964bPowell 1964b: Powell, J. A. 1964b. Biological and taxonomic studies on tortricine moths, with reference to the species in California. University of California Publications in Entomology. Vol. 32. 317 pp., 2006 |
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Acleris senescens is distributed along the Pacific Coast of North America from British Columbia south to California.
