Anthonomus musculus

Say, 1832

cranberry weevil

Anthonomus musculus, commonly known as the cranberry weevil, is a small weevil native to North America that is a significant agricultural pest of blueberries and cranberries. are tiny reddish-brown beetles with the characteristic curved snout of weevils. The has one per year, with females depositing in flower buds where larvae develop internally, preventing fruit formation. It ranges from New England to Florida and west of the Rocky Mountains, with notable pest pressure in Massachusetts, New Jersey, Wisconsin, and Michigan.

Papers on the cotton boll weevil and related and associated insects (1909) (14595371158) by United States. Bureau of Entomology. Used under a No restrictions license.

Pronunciation

How to pronounce Anthonomus musculus: //ænˈθɒnəməs ˈmʌskjʊləs//

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

Identification

Distinguished from other weevils by its small size (under 2.5 mm), reddish-brown coloration, and association with Vaccinium plants. The curved snout and compact oval body separate it from non-weevil beetles. Similar Anthonomus may require examination of genitalia or host plant association for definitive identification.

Images

Appearance

are tiny reddish-brown beetles measuring 1.6 to 2.0 millimeters in length (some sources report up to 3 mm). The body is stout and oval-shaped. The features a curved snout typical of weevils. are smooth, oblong, and pale yellow, approximately 0.4 to 0.5 millimeters long.

Habitat

Cultivated and wild stands of Vaccinium including cranberry bogs and blueberry fields. Overwinters in protected areas adjacent to plant beds, including leaf litter and debris. Associated with woody shrubs in the Ericaceae including swamp sweetbells, staggerbush, dangleberry, sheep laurel, swamp honeysuckle, and chokeberry.

Distribution

Native to North America. Ranges from New England to Florida and west of the Rocky Mountains. Documented as a pest in Massachusetts, New Jersey, Wisconsin, and Michigan. Distribution records include Nova Scotia, Ontario, Québec, and Saskatchewan in Canada.

Seasonality

are active during the day in spring and summer. One per year. Adults overwinter in protected areas and emerge in spring to feed on buds, flowers, and developing fruit.

Diet

feed on flowers, leaves, and buds of Vaccinium . Larvae develop inside flower buds, feeding internally on plant tissue and preventing fruit development.

Host Associations

Vaccinium macrocarpon - primary cultivated cranberry
Vaccinium corymbosum - primary cultivated blueberry
Lyonia mariana - wild swamp sweetbells
Lyonia ligustrina - wild staggerbush
Gaylussacia frondosa - wild dangleberry
Kalmia angustifolia - wild sheep laurel
Rhododendron viscosum - wild swamp honeysuckle
Aronia melanocarpa - wild chokeberry

Life Cycle

One per year. overwinter in protected areas. In spring, adults emerge and feed on plant buds, flowers, and leaves. Females deposit in flower buds. Larvae develop inside the buds, preventing fruit formation. occurs within the bud. New adults emerge and feed before seeking sites.

Behavior

activity pattern. are attracted to damaged cranberry flower buds. Males are attracted to volatile chemicals emitted by blueberry buds including hexanol, (Z)-3-hexenyl acetate, hexyl acetate, and (Z)-3-hexenyl butyrate. Adults may aggregate on plants.

Ecological Role

Herbivore and agricultural pest. Acts as a regulator of Vaccinium in natural settings, but causes economic damage in cultivated settings by reducing fruit yield through larval development in flower buds.

Human Relevance

Significant agricultural pest of commercially cultivated cranberries and blueberries. Economic damage results from reduced fruit set when larvae develop in flower buds. Subject to and control measures in cranberry-growing regions. No known beneficial uses.

Similar Taxa

Anthonomus eugeniiPepper weevil with similar body plan but associated with Capsicum and Solanum crops rather than Vaccinium
Orius insidiosusMinute pirate bug of similar size that may occur in same but is a beneficial with different body shape (Hemiptera, not Coleoptera)

More Details

Chemical Ecology

Males are attracted to specific volatile compounds from blueberry buds: hexanol, (Z)-3-hexenyl acetate, hexyl acetate, and (Z)-3-hexenyl butyrate. This kairomonal attraction may be exploitable for monitoring or control.

Historical Taxonomy

Described by Thomas Say in 1832. The specific epithet 'musculus' means 'little mouse,' likely referring to the small size and perhaps the snout resembling a mouse's nose.