Synonyms and other taxonomic changes
Choristoneura rosaceana (Harris, 1841)
Loxotaenia rosaceana Harris, 1841
Choristoneura vicariana (Walker, 1863)
Choristoneura gossypiana (Packard, 1869)
Explanation of Names
Specific epithet for the larval hosts in the Rosaceae family.
Forewing length: males 7.5-11 mm, females 11.5-14 mm. (LBAM
FW in male has a costal
fold (See detail image
) from base to top of AM, where dark scale tufts lie flat, forming a dark spot, which is absent in similar species. HW pale orange-yellow in male; deep-yellow in female, but may have gray shading in the lower third. (1)
Common throughout eastern N. America.
Polyphagous. Prefers plants from the Rosaceae family. A pest in apple, pear, and peach orchards and also will feed on blueberries and raspberries, ornamental shrubs, occasionally found feeding on pines. (2)
Two generations per year over the majority of its range, with one generation in northern areas and at higher elevations. Adults are present in late June - July and again in late August - September.
Final instar larva; pupa; adult
Other "bell-shaped" Leafrollers:
The following note was posted to Facebook by Jason Dombroskie on 11 January 2019:
Today I was asked how to separate species that look similar to Choristoneura rosaceana and thought I'd share my response here since it is commonly collected and frequently misIDed. The short answer is assume everything is C. rosaceana unless you have reason to believe otherwise. The longer answer is below and basically outlines my thought process. Note this doesn't always work and I still have a pile of specimens that I haven't put a name on yet. So treat this advice as tentative.
1. Archips purpurana males with stout FW with an angular costal margin and females with an exaggerated costal sinuosity.
2. C. fractivittana is pretty distinctive by smooth FW pattern in both sexes and slender costal fold in the male.
3. C. albaniana have a far northern / high elevation distribution. FW usually finely strigulated, can sometimes have a greyish wash or all grey. HW white.
4. Male C. rosaceana almost always have a rudimentary triangular costal fold (all species below lack a costal fold). Highly variable FW pattern. When in doubt, brushing the tip of the abdomen will show a bulbous uncus. Widespread and abundant.
5. C. obsoletana males usually have the median band obsolete in the middle of the FW. Common in FL, rare northwards to KS, IL, & MA. Uncus slender, sacculus more-or-less smooth and nearly reaches end of valve.
6. C. parallela males vary a bit in FW pattern, but usually pale brown - straw. Widespread in east, rare n of MO - OH - NY. Uncus slender, sacculus is roughly 3/4 length of the valve and with a variably expressed tooth near middle.
7. C. zapulata males usually have a pale straw FW. Widespread in west, in east restricted to Great Lakes dunes and a few populations in NB & QC. Brushing will show a variably broad uncus, sometimes almost similar to C. rosaceana.
8. Female C. rosaceana FW highly variable, costal margin usually sinuous, though not as exaggerated as A. purpurana. HW usually half orange half grey. Sterigma sclerotized and cup-shaped (largely membranous with a colliculum in next three species).
9. Female C. parallela FW with straight to at most subtly undulating costal margin, usually orange and with a well defined median band. HW half orange half grey.
10. Female C. obsoletana FW with straight costal margin, often orange and usually with the median band broadly interrupted in middle. HW yellow.
11. Female C. zapulata FW with straight costal margin, straw coloured. HW half whitish half grey.
Harris, T.W., 1841. Lepidoptera. Leaf-rollers (Tortrices). A report on the insects of Massachusetts, injurious to vegetation
Emmons, E., 1854. I. Insects of New York. Order XI. Lepidoptera (continued). Tortricidae. Leaf-rollers. Natural History of New York