The Alfalfa Weevil in Maryland1

Poos, F. W.; Bissell, T. L.

doi:10.1093/jee/46.1.178

Cited by 23 publications

(7 citation statements)

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“…In North America, alfalfa weevil populations are classified into three strains, eastern, Egyptian, and western (e.g. Wehrle , 1940; Poos and Bissell , 1953; Hsiao , 1993). They are hardly distinguished from each other by morphological features ( Pienkowski et al., 1969), but they exhibit different defensive responses to parasitic waSPS.…”

Section: Introductionmentioning

confidence: 99%

Coexistence of two mitochondrial DNA haplotypes in Japanese populations of Hypera postica (Col., Curculionidae)

Kuwata¹,

Tokuda²,

Yamaguchi

et al. 2005

J Applied Entomology

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In Japan, the alfalfa weevil, Hypera postica, was first recorded in 1982 from Fukuoka and Okinawa Prefectures and has been spreading to many other prefectures. The weevil seriously infests the Chinese milk vetch, Astragalus sinicus, one of the most important honey resources for honeybees in Japan. Direct sequencing of partial mitochondrial DNA and PCR-RFLP data for alfalfa weevil individuals indicated the coexistence of two haplotypes at various localities in Japan. Molecular phylogenetic analysis for H. postica haplotypes and strains indicated that the two Japanese haplotypes had not derived from a single genetic origin. Based on the results, special comments are made on biological control measures using introduced parasitic wasps.

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Section: Introductionmentioning

confidence: 99%

Coexistence of two mitochondrial DNA haplotypes in Japanese populations of Hypera postica (Col., Curculionidae)

Kuwata¹,

Tokuda²,

Yamaguchi

et al. 2005

J Applied Entomology

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“…The western strain was Þrst reported near Salt Lake City, UT, in 1904(Titus 1910; the Egyptian strain near Yuma, AZ, in 1939(Wehrle 1940; and the eastern strain from Maryland in 1952 (Poos andBissell 1953, Wood et al 1978). Since the initial introductions, the complex of strains has spread throughout the continental United States and into Canada and Mexico (Hsiao 1993), and alfalfa weevil has become established as the most damaging pest of alfalfa, Medicago sativa L., in the United States (USDAÐAPHIS 1991).…”

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confidence: 99%

Strain Distribution of Alfalfa Weevil (Coleoptera: Curculionidae) in an Intergrade Zone

Bundy

Smith

English

et al. 2005

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Strain distribution for the alfalfa weevil, Hypera postica (Gyllenhal), was determined for the five major alfalfa-growing regions of New Mexico. Mitochondrial DNA from field-collected weevils at each location was digested and sequenced to differentiate among strains. Eastern, Egyptian, and western strains were recovered, along with a population not matching any known strain. The majority of sites examined had populations of two strains intermingled within a field. This is the first confirmation of the presence of all three strains within the same geographic region. Possible implications for alfalfa weevil management are discussed.

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“…The alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae: Hyperini), native to the Western Palearctic region, is a serious pest of alfalfa and other beneficial legumes in its invading territories, such as Medicago , Vicia , Trifolium, and Astragalus 10 – 12 (Nearctic, Japan, Southeast Asia, and Oceania 13 – 15 ). Invading populations in the USA comprise the Western (North American) type that invaded Utah in 1904 16 , the Egyptian type that invaded Arizona in 1939 17 , and the Eastern (North American) type that invaded Maryland in 1951 18 . These types are different in their ecological, behavioral, and defensive traits (pupation site and aggregation during aestivation 13 , defensive behavior 19 , and encapsulation of immature endoparasitoid 20 – 22 ) but are morphologically indistinguishable.…”

Section: Introductionmentioning

confidence: 99%

Diversification, selective sweep, and body size in the invasive Palearctic alfalfa weevil infected with Wolbachia

Tuda

Iwase

Kébé³

et al. 2021

Sci Rep

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The alfalfa weevil Hypera postica, native to the Western Palearctic, is an invasive legume pest with two divergent mitochondrial clades in its invading regions, the Western clade and the Eastern/Egyptian clade. However, knowledge regarding the native populations is limited. The Western clade is infected with the endosymbiotic bacteria Wolbachia that cause cytoplasmic incompatibility in host weevils. Our aim was to elucidate the spatial genetic structure of this insect and the effect of Wolbachia on its population diversity. We analyzed two mitochondrial and two nuclear genes of the weevil from its native ranges. The Western clade was distributed in western/central Europe, whereas the Eastern/Egyptian clade was distributed from the Mediterranean basin to central Asia. Intermediate mitotypes were found from the Balkans to central Asia. Most Western clade individuals in western Europe were infected with an identical Wolbachia strain. Mitochondrial genetic diversity of the infected individuals was minimal. The infected clades demonstrated a higher nonsynonymous/synonymous substitution rate ratio than the uninfected clades, suggesting a higher fixation of nonsynonymous mutations due to a selective sweep by Wolbachia. Trans-Mediterranean and within-European dispersal routes were supported. We suggest that the ancestral populations diversified by geographic isolation due to glaciations and that the diversity was reduced in the west by a recent Wolbachia-driven sweep(s). The intermediate clade exhibited a body size and host plant that differed from the other clades. Pros and cons of the possible use of infected-clade males to control uninfected populations are discussed.

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The Alfalfa Weevil in Maryland1

Cited by 23 publications

References 0 publications

Coexistence of two mitochondrial DNA haplotypes in Japanese populations of Hypera postica (Col., Curculionidae)

Coexistence of two mitochondrial DNA haplotypes in Japanese populations of Hypera postica (Col., Curculionidae)

Strain Distribution of Alfalfa Weevil (Coleoptera: Curculionidae) in an Intergrade Zone

Diversification, selective sweep, and body size in the invasive Palearctic alfalfa weevil infected with Wolbachia

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