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Species Hypera postica - Alfalfa Weevil

Weevil - Hypera postica Weevil - Hypera postica Hypera postica (Gyllenhal) - Hypera postica Curculionidae - ? - Hypera postica Wevil - Hypera postica Weevil - Hypera postica Curculionidae - Hypera postica Beetle 5.2mm - Hypera postica
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Curculionoidea
Family Curculionidae (Snout and Bark Beetles)
Subfamily Hyperinae
Genus Hypera
No Taxon (subgenus Hypera)
Species postica (Alfalfa Weevil)
Other Common Names
Alfalfa Leaf Weevil
Explanation of Names
Hypera postica (Gyllenhal 1813)
3.0-5.5 mm(1)
Adult with distinctive dark stripe along the back, larva green with white stripe, similar to clover leaf weevil [the latter cause no serious damage to alfalfa]
Native to Eurasia (Europe to C. Asia)(2), adventive and widespread in NA (across so. Canada & the lower US states) (3)(4)
Adults and larvae feed on alfalfa (3)
Earliest record in our area: UT 1904(3)
One of the primary defoliators of alfalfa. The parasitic wasps Bathylplectes anurus and B. curculionis have been introduced into the US for biocontrol.
Medicago can repels small weevil larvae attacks by their gladular trichomes. These exudates vary in fluidity and frequency with weather and time of day. They can block the spiracles and adhere to the larvae, making them immobile. (5)
Internet References
Fact sheet (Cook et al. 2004)(3)