Choristoneura rosaceana

(Harris, 1841)

oblique-banded leafroller, rosaceous leaf roller, oblique banded leaf roller

is a tortricid native to North America that has been accidentally introduced to other parts of the world. The is a herbivore whose larvae feed on a broad range of woody and herbaceous plants, with documented spanning over 30 plant in more than 20 . Caterpillars construct leaf rolls for shelter and feeding, causing damage to foliage and occasionally fruit. are in most of their range, with periods in early and late summer.

Choristoneura rosaceana P1190504a by
xpda. Used under a CC BY-SA 4.0 license.

Choristoneura rosaceana 1 by Jacy Lucier. Used under a CC BY-SA 4.0 license.

Choristoneura rosaceana P1390673a by
xpda. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Choristoneura rosaceana: /kʰɔˌrɪstoʊˈnʊrə roʊsəˈsiːənə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

can be distinguished from other Choristoneura by genitalia examination; superficially similar to C. fumiferana (spruce budworm) and C. conflictana (large aspen tortrix) but with different associations and geographic patterns. Larvae are recognized by the combination of green body, black , and leaf-rolling . The species is more than most , which often specialize on conifers or particular hardwoods. Molecular identification may be necessary where ranges overlap with similar species.

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Habitat

Found in diverse environments including deciduous and mixed forests, orchards, ornamental plantings, and riparian areas. Occupies where plants are present, from natural woodland to agricultural and urban settings. Larval microhabitat consists of rolled leaves on host plants.

Distribution

Native to North America, with documented occurrence in Canada (Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, Quebec, Saskatchewan) and the United States (Arizona, Arkansas, California, Colorado, Florida, Georgia, Iowa, Louisiana, Maine, Massachusetts, Michigan, Mississippi, New York, North Dakota, Oregon, Pennsylvania, Texas, Utah, Vermont, Washington, Wisconsin, Wyoming). Introduced established outside native range through accidental transport.

Seasonality

in most of range: on wing June–July and August–September. Larval feeding occurs during spring and summer months; as diapausing larvae in second or third instar.

Diet

Larvae are folivores that feed on leaves of diverse plants. Documented hosts include in Rosaceae (Malus, Prunus, Rosa, Rubus, Sorbus, Spiraea), Salicaceae (Populus, Salix), Betulaceae (Betula, Corylus), Aceraceae (Acer), Oleaceae (Fraxinus, Syringa), Caprifoliaceae (Lonicera, Viburnum), Ericaceae (Rhododendron, Vaccinium), Pinaceae (Picea, Pinus, Tsuga), and numerous other woody and herbaceous plants including Fragaria, Dianthus, and Verbena.

Host Associations

Malus - apple; highly suitable , females achieve greater pupal weight and 26% greater than on alternative hosts
Prunus - peach, plum, cherry
Rosa - rose
Rubus - bramble, raspberry
Populus - aspen, poplar
Salix - willow
Betula - birch
Corylus - hazelnut
Acer - maple
Fraxinus - ash
Syringa - lilac
Rhododendron - rhododendron, azalea
Picea - spruce
Pinus - pine
Fragaria - strawberry

Life Cycle

Complete with , larva, pupa, and stages. Eggs laid on plants. Larvae feed through summer, with some entering in second or third instar in fall. larvae resume feeding in spring, pupate, and emerge as adults. Two per year in most of range; some may have partial third generation in favorable conditions. Development time and diapause propensity vary with host plant and season.

Behavior

Larvae construct silk-tied leaf rolls for shelter and feeding, remaining concealed during daylight. First instar larvae disperse by ballooning or crawling to locate suitable plants; rates influenced by leaf texture, availability, and plant odor. are and attracted to light. Females exhibit calling ( release) with diel periodicity, peaking around 2000 hours. Oviposition occurs primarily between 0400–2400 hours. Females show oviposition preference hierarchy: apple and snowberry preferred over wild rose. Aversive learning documented: females delay laying second clutch on less preferred host after initial experience.

Ecological Role

Herbivore that functions as folivore in forest, orchard, and riparian . Larval feeding contributes to leaf damage and nutrient cycling; represents food source for including ichneumonid Apophua simplicipes. Susceptible to fungi including bassiana and .

Human Relevance

Economic pest of apple and other orchard crops in North America. Larval feeding causes rolled, tied, and chewed leaves with minor fruit damage; damage can be extensive on rosaceous plants. Subject to management with including spinosad, though applications may harm agents. Kaolin particle films have been investigated as behavioral deterrent. -based monitoring and used for management. Laboratory colonies maintained for research on insecticide resistance, pheromone communication, and biological control.

Similar Taxa

Choristoneura fumiferanaSimilar and conifer-feeding habit, but C. fumiferana specializes on spruce and fir with more restricted range; genitalia examination required for definitive separation
Choristoneura conflictanaLarge aspen tortrix feeds primarily on aspen, poplar, willow, and alder; larvae overwinter and roll leaves tightly in older instars; less than C. rosaceana
Choristoneura houstonanaSpecializes on juniper; caterpillar rolls juniper leaves specifically; restricted association distinguishes from C. rosaceana

More Details

Insecticide resistance

have developed , with associated modifications to communication. females show delayed calling onset, shorter calling duration, and reduced pheromone production compared to susceptible individuals.

Research significance

Serves as model organism for studies on herbivore selection, learning , and evolutionary of polyphagy. sequenced for evolutionary studies.