Sparganothis sulfureana

(Clemens, 1860)

sparganothis fruitworm moth, blueberry leafroller

Sparganothis sulfureana is a and major agricultural pest of (Vaccinium macrocarpon) in North America. cause through two distinct feeding behaviors: spring feeding on new foliar growth reduces photosynthetic capacity, while second- larvae bore into enlarging berries, with each larva destroying 3–5 berries. The is , as first- larvae, and has been documented on multiple plants including blueberry, apple, alfalfa, celery, and pine. Management relies on strategies including models for timing , flooding, and developing -based .

Identification

can be distinguished from similar by the combination of small size (10–20 mm wingspan), yellowish-sulfurous coloration, and distribution in eastern North America. are recognized by their presence in webbed leaf shelters or within berries during summer. Accurate identification to level typically requires dissection and examination of or molecular confirmation.

Habitat

Commercial marshes and cultivated cranberry (Vaccinium macrocarpon) production systems in northern United States and southeastern Canada. Natural include wetlands and areas supporting plants such as blueberry, loosestrife, and other forbs and . Seasonal flooding of cranberry inhibits development and is used as a management practice.

Distribution

Eastern North America from Canada (Alberta, Manitoba, Saskatchewan) through the northern United States, with highest pest pressure in Wisconsin (produces ~60% of US ) and New Jersey. Also recorded from Cuba. GBIF records confirm presence in Vermont and Canadian provinces.

Seasonality

with two per year. emerge in spring during bloom, with peak predicted at approximately 430 (base 10°C, upper 30°C) from 50% cranberry tip biofix. Peak laying occurs at ~554 degree-days. Second generation adults active mid-summer. Climate change projections suggest peak flight may occur up to one week earlier by 2050 in New Jersey.

Diet

Highly feed on (Vaccinium macrocarpon), blueberry (Vaccinium spp.), apple (Malus spp.), alfalfa (Medicago sativa), celery (Apium graveolens), pine (Pinus spp.), and loosestrife (Lythrum spp.). Within cranberry , prefers cranberry, blueberry, and loosestrife. First feeds on new foliar growth in spring; second generation bores into enlarging berries.

Host Associations

Vaccinium macrocarpon - primary major commercial pest; destroy 3–5 berries each
Vaccinium spp. - blueberry
Malus spp. - apple
Medicago sativa - alfalfa
Apium graveolens - celery
Pinus spp. - pine
Lythrum spp. - loosestrife; preferred weed within
Ascogaster mimetica - -larval ; recognizes by egg surface

Life Cycle

Overwinters as first- . Completes two annually; rarely a third generation may occur in fall. First generation: larvae feed on new foliar growth in spring, reducing photosynthetic capacity. occurs in webbed shelters. Second generation: larvae bore into enlarging berries, each destroying 3–5 berries through feeding and . Development from to completed without significant differences in duration among . laid in masses (~60 eggs per mass) with surface deposited from female body.

Behavior

weave upright stems together with to create leaf tents for shelter. Second- larvae web berries together, creating protected feeding shelters within the fruit cluster. production visible at webbed sites indicates active feeding. mate soon after ; females with surface that serve as for recognition.

Ecological Role

Major economic pest of requiring intensive . Increasing to documented in some East Coast . Broad-spectrum for management harm including and . Serves as for -larval Ascogaster mimetica, which locates hosts using chemical and tactile cues from egg surface .

Human Relevance

Significant agricultural pest causing direct yield losses in production through fruit damage and . Management costs include , flooding operations, , and development of technologies. Projected climate change effects may alter and increase management complexity.

Similar Taxa

Choristoneura parallelaCo-occurs in bogs; lack surface that characterize S. sulfureana, resulting in reduced by Ascogaster mimetica

More Details

Degree-day model refinement

Standard biofix of 1 March is unsuitable for warmer regions where winter flooding inhibits development. Alternative biofixes of 15 April (average drainage date) or individual drainage dates (521–525.5 ) provide improved prediction for peak timing.

Cultivar susceptibility

Laboratory studies found no significant among major ('Stevens', 'Ben Lear', 'GH-1', 'HyRed', 'Mullica '). Mid- larval weight differences on 'Ben Lear' and 'Mullica Queen' did not correlate with pupal weight, development time, or survival rates, failing to explain field differences observed in prior studies.

Parasitoid host recognition

surface deposited by female during serve as critical for Ascogaster mimetica recognition. Hexane washing of eggs to remove scales reduces drumming and probing/ovipositing behaviors to levels comparable with nonhost eggs, demonstrating the essential role of these chemical and tactile cues.