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Green Valley, AZ, United States

Cazado L.E.,Seccion Zoologia Agricola | Cazado L.E.,CONICET | O'Brien C.W.,2313 W. Calle Balaustre | Casmuz A.S.,Seccion Zoologia Agricola | And 3 more authors.
Florida Entomologist

Examination with a binocular microscope of adults of Rhyssomatus subtilis Fielder (Coleoptera: Curculionidae) revealed distinct differences between the sexes in the foreleg, which permits their differentiation with complete accuracy. In the female the profemual process is weak, subacute, angulate and the protibia has an uncus and mucro. In the male the profemur process is strong, curved, subacute, tooth-like and lacks an protibia uncus. © Florida Entomologist 2014. Source

Cazado L.E.,Seccion Zoologia Agricola | Cazado L.E.,CONICET | Murua M.G.,Seccion Zoologia Agricola | Murua M.G.,CONICET | And 6 more authors.
Florida Entomologist

Rhyssomatus subtilis, the black soybean weevil, has emerged as a major pest of soybean [Glycine max (L.) Merr. (Fabales: Fabaceae)] in northwestern Argentina during the last 3 yr. This species was detected in 30 localities of Salta, Santiago del Estero and Tucumán provinces comprising a total area of about 541,000 ha. This species was observed for the first time developing on dry bean [Phaseolus vulgaris L. (Fabales: Fabaceae)] crops and feeding on 3 unrelated weeds [Conyza bonariensis (L.) Cronquist (Asterales: Asteraceae), Brassica campestris (L.) Metzg. (Brassicales: Brassicaceae) and Sphaeralcea bonariensis (Cav.) Griseb (Malvales: Malvaceae)]. The damage produced by R. subtilis in dry bean crops is similar to that produced in soybean crops. The results obtained suggest that as of 2012, R. subtilis has greatly expanded its distribution since its first detection in 2006 and produces major direct and indirect damage in soybean and dry bean crops in northwestern Argentina. Source

Chamorro-Florescano I.A.,University of Veracruz | Lopez-Guillen G.,Instituto Nacional de Investigaciones Nucleares | Martinez-Zacarias A.A.,University of Veracruz | O'Brien C.W.,2313 W. Calle Balaustre
Florida Entomologist

We present the first record of Rhizophora mangle (Malpighiales: Rhizophoraceae) as a host of Acalles sablensis Blatchley, 1920 (Coleoptera: Curculionidae: Cryptorhynchinae) in the Ramsar site No. 1602 of the Mangroves and Wetlands of Tuxpan. The presence was recorded of dead Rhizophora mangle propagules that presented perforations in the bark. Beetles of the family Curculionidae was found within the propagules and identified as Acalles sablensis. This species has previously only been recorded in Cape Sable and Chokoloskee, Florida, USA, in 1920 and 1922 in dead branches of Sideroxylon celastrina (Kunth) T. D. Penn (Ericales: Sapotaceae) (Blatchley 1920, 1922). This study represents the first report of this curculionid species in Mexico. © Florida Entomologist 2014. Source

A key to the subtribes and genera of the Curculionini is presented, and two new genera are described: Pseudoculio with Curculio (Balaninus) discreticoxis Marshall, as its type species (new combination); and Megaoculis with Megaoculis egeri, new species, as its type species. Keys to the species of the new genera are provided. Photos of habitus are included for most taxa and of genitalia of the new species. The following taxa are described as new in this paper: subtribes Archariina, new subtribe, Erganiina, new subtribe, and Labaninina, new subtribe; and new species: Pseudoculio barclayi, new species, P. confusicoxis , new species, P. crinitus, new species, P. promissus, new species, P. spiesi, new species, and P. vittatus, new species. Curculio guyanensis Rheinheimer is reassigned to the new genus Megaoculis, new combination. The following genera placed in Incertae sedis in Alonso-Zarazaga and Lyal are removed from the tribe: Allocionus Hustache, Balaninorhynchus Fairmaire, Bradyninus Fairmaire, Semicardius Hustache and Trichanthonomus Hustache. © 2011 Magnolia Press. Source

Cazado L.E.,Seccion Zoologia Agricola | Cazado L.E.,CONICET | Van Nieuwenhove G.A.,Seccion Zoologia Agricola | O'Brien C.W.,2313 W. Calle Balaustre | And 3 more authors.
Florida Entomologist

Rhyssomatus subtilis Fiedler (Coleoptera: Curculionidae) is an important pest of the soybean crop in northwestern Argentina. Few studies have been made on specific parameters of its life history and ecology. The aim of this study was to determine the number of larval stages of R. subtilis. One thousand and eighteen larvae were collected from soybean plants during 2 yr (2011 and 2013), and head capsule width of each larva was measured. For analysis of data, the Hcap program and Dyar's rule were used. The Hcap program showed 4 different peaks in the frequency distribution of the head capsule widths. This result also agreed with Dyar's rule that revealed a perfect geometric larval growth pattern for each instar by regression analysis. The excellent fit to a linear model, indicates that no instar was overlooked. This research identified 4 instars for R. subtilis. Source

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