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  • Acorn Weevil - (Conotrachelus posticatus)

    Acorn Weevil - (Conotrachelus posticatus)

    The nut-loving Acorn Weevil efficiently uses acorns that it collects: as larvae, acorns are food, and as adults acorns are a nursery.

    Picture of Acorn Weevil
    Staff Writer (9/11/2017): Acorn Weevils have a long snout reminiscent of an elephant's trunk. It makes it easier to identify this type of beetle. This snout has chewing mouth parts at the end. Females lay a fertilized egg into the soft tissue of a young acorn, the seed of oak trees, when they first start growing.

    Through summertime, the acorn grows and hardens. Inside the weevil larva feeds on the seed's interior. In early autumn, the acorn falls off the branch onto the ground below. Soon after, the weevil larva (grub) chews a small hole into the acorn seed and leaves the acorn in early winter, burrowing into the soil. There it can remain hidden from predators while it develops into an adult. The larvae are a protein-packed food source for many other insects, as well as spiders and small animals.

    Acorn Weevils can inhibit oak tree expansion if an area is infested. Their larval diet of acorns can result in fewer new oak trees in that area, however, existing trees are not in any danger. Adult Acorn Weevils are hunted by a variety of Weevil Wasps and will eventually become live meals for hatching wasp larvae.

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    Details of the:
    Acorn Weevil

    Category: Beetle
    Common name: Acorn Weevil
    Scientific Name: Conotrachelus posticatus
    Other Names: Nut Weevil

      Kingdom: Animalia
       Phylum: Arthropoda
        Class: Insecta
         Order: Coleoptera
          Family: Curculionidae
           Genus: Conotrachelus
            Species: posticatus

    Size (Adult, Length): 4mm to 10mm (0.16in to 0.39in)

    Identifying Colors: brown, black

    Additional Descriptors: snout, trunk, nose, hairy, fuzzy, flying

    North American Reach (Though Not Limited To*): Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Hawaii; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; 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; Wyoming; Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Saskatchewan; Mexico

    * Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.

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