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.
Se describe Rhinusa chaenorhini sp. nov. de varias localidades de España distribuidas de norte a sur de la mitad oriental del territorio. La nueva especie es claramente diferenciable de todas las ...especies del género principalmente por la inusual forma del rostro, el cual esta abruptamente constreñido desde la inserción antenal hasta el ápice, y por la forma del edeago.
A new Cryptorhynchinae weevil Viraktamathiagen. nov. and srinivasasp. nov. from India is described and illustrated. This genus is unique among the Cryptorhynchinae in the concavity of the ventrite 1 ...combined with the character of the pair of knobs on the uncus of the hind tibia.
Carlina acaulis L. is a herb mainly used in central Europe as traditional medicine or food. Recently, C. acaulis essential oil (EO) and its nanoemulsion showed elevated efficacy against several ...insects of medical and agricultural importance. In the current study, efficacy of C. acaulis EO was estimated against several stored product pests. The EO was sprayed on wheat to control Acarus siro L. (adults, nymphs), Alphitobius diaperinus (Panzer) (adults, larvae), Oryzaephilus surinamensis (L.) (adults, larvae), Rhyzopertha dominica (F.) (adults), Sitophilus oryzae (L.) (adults), Tenebrio molitor L. (adults, larvae), Tribolium castaneum (Herbst) (adults, larvae), and Tribolium confusum Jacquelin du Val (adults, larvae). Carlina acaulis EO was mainly composed by carlina oxide (98.8%), with benzaldehyde (1.2%) and ar-curcumene (traces) as minor components. Both adults and nymphs of A. siro showed high mortality, i.e., 91.1 and 95.6%, after 7 days of initial exposure to 1000 ppm (1000 μL C. acaulis EO/kg wheat), respectively. This concentration provided the death of 25.6% of the exposed A. diaperinus adults at the termination of trials. Total mortality (100.0%) of A. diaperinus larvae was reached 2 and 4 days after initial exposure on wheat sprayed with 1000 and 500 ppm of C. acaulis EO, respectively. One thousand (1000) ppm of EO killed 96.7% of O. surinamensis adults and all larvae 7 and 2 days after initial exposure, respectively. Concerning adults of R. dominica and S. oryzae, 1000 ppm achieved complete mortality after 4 and 6 days of initial exposure, respectively. Tenebrio molitor adults reached 81.1% mortality after their 7-days exposure to 1000 ppm C. acaulis EO. All T. molitor larvae were dead after 7 or 4 days of initial exposure to 500 and 1000 ppm, respectively. Carlina acaulis EO caused 97.8 and 100.0% mortality to adults of T. castaneum after 7 and 5 days of initial exposure to 1000 and 500 ppm, respectively. Complete mortality was observed after 16 h (1000 ppm) and 2 days (500 ppm) of initial exposure for T. castaneum larvae. Similarly, both examined stages of T. confusum achieved 100.0% mortality at the concentrations of 500 and 1000 ppm, after 7 and 4 days (adults), and 1 day and 16 h (larvae) of exposure, respectively. Overall, C. acaulis EO demonstrated pesticidal efficacy higher to pirimiphos-methyl, a conventional organophosphate insecticide, against a wide range of stored-product pests. Therefore this EO represents a reliable option for further developing eco-friendly and non-hazardous pest management strategies.
Display omitted
•Carlina acaulis EO killed 91% > A. siro adults and nymphs within 7 days at 1000 ppm.•All adults of R. dominica and S. oryzae died after 4 and 6 days at 1000 ppm EO respectively.•Mortality of T. castaneum and T. confusum adults and larvae was 100% at 1000 ppm C. acaulis EO.•Carlina acaulis EO killed 100% of T. molitor larvae after 4 days at 1000 ppm.•All O. surinamensis and A. diaperinus adults died after 2 days at 1000 ppm C. acaulis EO.
This study describes two new species,
Liao, Lai & Beaver,
and
Liao, Lai & Beaver,
, reinstates
(Tsai & Huang, 1965) from synonymy with
(Blandford, 1893), and records five species for the first time ...from China,
Blandford, 1898,
Gebhardt, 2006,
Hagedorn, 1904,
Eggers, 1939,
Maiti & Saha, 2009, and three from mainland China,
Gebhardt, 2006,
Beaver & Liu, 2007,
Hagedorn, 1904. A key to the males of
species in China is given. Genetic data from four genes indicate a rather isolated position for both new species, although their genetic relationship to each other was close.
Thirty species of Curculionoidea (28 Curculionidae and one each of Brentidae and Nemonychidae) are reported as new records from the Canadian province of Newfoundland and Labrador, most of them from ...the island of Newfoundland. As well, 13 species of Curculionidae and one of Brentidae previously recorded from Newfoundland are newly reported from Labrador, and one Curculionidae previously recorded from Labrador is newly reported from Newfoundland. The Palearctic species,
(Beck), is herein reported as a new Canadian and North American record, with specimens documented from Newfoundland and British Columbia. Additions to the primary key for North American weevils are provided to help identify this genus among the North American fauna. Of the species of Curculionoidea previously recorded from the province in published literature, there is uncertain evidence for the occurrence of 14 species in the province as a whole or in the Labrador portion. Seven species are hereby removed from the faunal list for the province. One of those,
(Linnaeus), is also removed from the Canadian faunal list. The 134 species of Curculionoidea recorded from NL are listed and a brief synopsis of the fauna provided.
Abstract
The phylogeny and evolution of weevils (the beetle superfamily Curculionoidea) has been extensively studied, but many relationships, especially in the large family Curculionidae (true ...weevils; > 50,000 species), remain uncertain. We used phylogenomic methods to obtain DNA sequences from 522 protein-coding genes for representatives of all families of weevils and all subfamilies of Curculionidae. Most of our phylogenomic results had strong statistical support, and the inferred relationships were generally congruent with those reported in previous studies, but with some interesting exceptions. Notably, the backbone relationships of the weevil phylogeny were consistently strongly supported, and the former Nemonychidae (pine flower snout beetles) were polyphyletic, with the subfamily Cimberidinae (here elevated to Cimberididae) placed as sister group of all other weevils. The clade comprising the sister families Brentidae (straight-snouted weevils) and Curculionidae was maximally supported and the composition of both families was firmly established. The contributions of substitution modeling, codon usage and/or mutational bias to differences between trees reconstructed from amino acid and nucleotide sequences were explored. A reconstructed timetree for weevils is consistent with a Mesozoic radiation of gymnosperm-associated taxa to form most extant families and diversification of Curculionidae alongside flowering plants—first monocots, then other groups—beginning in the Cretaceous.
A very large, new, and distinctive species of
Conotrachelus
Dejean is described from Área de Conservación Guanacaste, Costa Rica.
Conotrachelus
terryerwini
sp. nov.
(type locality Volcan Orosi, ...Estación Biológica Maritza, Guanacaste, Costa Rica) is described and named in honor of Terry L. Erwin (1940–2020), famed carabidologist and biodiversity champion. This majestic species is easily distinguished by its large body size (15–20 mm) and extremely long rostrum (especially in females).
PDF
