Anthonomus quadrigibbus

The species can be distinguished from other Anthonomus species by morphological features including the shape of the fore femora and fore tibiae, the structure of the male aedeagus, and the coloration of body setae. The specific epithet "quadrigibbus" (four-humped) refers to characteristic protuberances on the pronotum.

Associated with rosaceous fruit-bearing shrubs and trees, particularly in temperate regions of North America. Overwinters as adults in leaf litter.

Native to North America. Recorded from Canada (Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, Quebec, Saskatchewan) and throughout the contiguous United States (Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin) and Mexico.

Adults emerge from overwintering sites in mid- to late May, coinciding with anthesis and fruit drop of host plants. Oviposition occurs toward the end of the fruit drop period, approximately 30 days after peak anthesis. Larval development occurs through June to mid-July, with new generation adults emerging in mid-July as fruits ripen. Adults then enter leaf litter to overwinter.

Adults feed on unripe fruits of rosaceous hosts. Larvae feed exclusively on ovules within developing fruits.

• Amelanchier alnifolia - primary hostSaskatoon berry; detailed phenological study conducted on this host in Saskatchewan
• Malus - hostapple; reflected in common name "apple curculio"
• Prunus - hoststone fruits including cherries and plums
• Pyrus - hostpear
• Sorbus - hostmountain-ash

Complete metamorphosis with one generation per year. Eggs are deposited singly in punctures at the base of fruits. Larvae complete development within the fruit, feeding on ovules. Pupation occurs within the fruit or in the soil. New generation adults emerge in mid-July and immediately seek overwintering sites in leaf litter.

Adults cause considerable damage to unripe fruits through feeding punctures. Oviposition is precisely timed to the end of the fruit drop period of the host plant, with females depositing single eggs in punctures at the fruit base. The species exhibits strong phenological tracking of host plant development stages.

Fruit-feeding herbivore that can act as a significant pest of rosaceous fruit crops and native fruit-bearing shrubs. As an overwintering adult in leaf litter, it contributes to litter community dynamics.

Recognized as a pest of apple and other rosaceous fruits. Listed as a species of phytosanitary concern in Russia, indicating potential for international spread and establishment. The species has demonstrated invasive potential beyond its native range.

• Anthonomus signatusStrawberry bud weevil; similar genus and fruit-feeding ecology, but distinguished by morphology of fore legs and male genitalia
• Anthonomus grandisBoll weevil; major cotton pest, distinguished by host association and morphological features
• Anthonomus eugeniiPepper weevil; distinguished by host plants and morphological characters used in diagnostic keys

• pest
• fruit-feeding
• rosaceae
• curculionidae
• phenology
• overwintering
• leaf litter
• phytosanitary
• invasive potential

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• ID Challenge #9 | Beetles In The Bush
• Anthonomus quadrigibbus . [Distribution map].
• PHENOLOGY OFHOPLOCAMPA MONTANICOLAROHWER (TENTHREDINIDAE) ANDANTHONOMUS QUADRIGIBBUSSAY (CURCULIONIDAE) ON THEIR HOST PLANTAMELANCHIER ALNIFOLIANUTT. (ROSACEAE) IN SASKATCHEWAN
• О некоторых видах рода Anthonomus Germar (Coleoptera, Curculionidae), имеющих фитосанитарное значение для Российской Федерации