scholarly journals Behavioural response of the house mosquitoes Culex quinquefasciatus and Culex pipiens molestus to avian odours and its reliance on carbon dioxide

2020 ◽  
Vol 34 (2) ◽  
pp. 129-137 ◽  
Author(s):  
C. G. Spanoudis ◽  
S. S. Andreadis ◽  
D. P. Bray ◽  
M. Savopoulou‐Soultani ◽  
R. Ignell
Keyword(s):  
Carbon Dioxide ◽  
Culex Quinquefasciatus ◽  
Culex Pipiens ◽  
Behavioural Response ◽  
Culex Pipiens Molestus

scholarly journals Gonoactivity of Culex (Culex) (Diptera: Culicidae) Mosquitoes During Winter in Temperate Argentina

2021 ◽  
Author(s):  
María Florencia Branda ◽  
Magdalena Laurito ◽  
Andrés Mario Visintin ◽  
Walter Ricardo Almirón
Keyword(s):  
Developmental Stage ◽  
Culex Quinquefasciatus ◽  
Culex Pipiens ◽  
Life Cycles ◽  
Morphological Identification ◽  
Dry Ice ◽  
Culex Pipiens Pipiens ◽  
Host Seeking ◽  
Baited Traps ◽  
The City

Abstract The subgenus Culex L. includes species involved in summer–autumn arbovirus transmission but studies during winter are scarce in temperate Argentina. Female specimens were collected host-seeking at dry-ice-baited traps during autumn–winter–spring at two sites in Córdoba City during 2016 and 2017. The specimens were morphologically identified and dissected to determine the follicular developmental stage (gonotrophic activity). Females with advanced follicular stages (≥III) were subjected to molecular procedures to confirm or re-identify previous morphological identification. Five species (Culex apicinus Philippi (Diptera: Culicidae), Culex dolosus (Lynch-Arribálzaga) (Diptera: Culicidae), Culex maxi Dyar (Diptera: Culicidae), Culex pipiens pipiens L. (Diptera: Culicidae), and Culex quinquefasciatus Say (Diptera: Culicidae)) were collected and found gonoactive during winter; showing that a high proportion of Culex (Culex) females remain reproductively active during the unfavorable season for mosquito populations. Among them, it is worth noting the collection of Cx. quinquefasciatus, vector of the St. Louis encephalitis virus (endemic in the city), a specimen of Cx. p. pipiens, and a hybrid of Cx. p. pipiens/Cx. quinquefasciatus (during autumn). The study of this community during winter should continue because a high gonoactive female proportion with advanced follicular stages was found: 29.12 and 13.07% in 2016 and 2017, respectively. Local studies such as this one provide evidence about ornithophilic Culex species with active year-round life cycles, species that could favor arbovirus overwintering.

scholarly journals EXTRACHROMOSOMAL INHERITANCE OF CARBON DIOXIDE SENSITIVITY IN THE MOSQUITO CULEX QUINQUEFASCIATUS

Genetics ◽  
1983 ◽  
Vol 104 (4) ◽  
pp. 649-659
Author(s):  
Donald A Shroyer ◽  
Leon Rosen
Keyword(s):  
Carbon Dioxide ◽  
Culex Quinquefasciatus ◽  
Natural Populations ◽  
Infectious Agent ◽  
Maternal Transmission ◽  
Co2 Sensitivity ◽  
Laboratory Colony ◽  
F1 Progeny ◽  
Extrachromosomal Inheritance ◽  
Sigma Virus

ABSTRACT Mosquitoes from a laboratory colony of Culex quinquefasciatus from Matsu Island, China, develop irreversible paralytic symptoms after exposure to carbon dioxide at 1°. This CO2 sensitivity is caused by an inherited infectious agent, probably a virus. Crossing studies between CO2-sensitive and -resistant mosquitoes showed that the sensitivity trait is inherited extrachromosomally in a fashion strictly analogous to the hereditary transmission of sigma virus in Drosophila melanogaster. Sensitivity could be maintained through maternal transmission alone, despite nine generations of backcrossing of "stabilized" CO2-sensitive females to males from a resistant strain. CO2-sensitive males crossed to resistant females transmitted sensitivity to a portion of their F1 progeny, and only the female F1 sensitives were capable of further hereditary transmission.—Matsu, or a very similar hereditary infectious agent, is common in natural populations of Cx. quinquefasciatus on Oahu, Hawaii. Fifty-nine percent of the families reared from field-collected egg rafts contained CO2-sensitive mosquitoes, and some families contained only sensitive mosquitoes.

The Susceptibility of various Species of Mosquitos to DDT, Dieldrin and BHC

1955 ◽  
Vol 46 (2) ◽  
pp. 301-309 ◽  
Author(s):  
R. H. Wharton
Keyword(s):  
Aedes Aegypti ◽  
Culex Pipiens ◽  
Lethal Concentration ◽  
Median Lethal Concentration ◽  
Adult Females ◽  
Anopheles Maculipennis ◽  
Culex Pipiens Molestus ◽  
Filter Papers

The susceptibility of various mosquitos to DDT, dieldrin and BHC has been studied. Adult females were exposed in small tubes lined with filter papers impregnated with insecticide-oil solutions. Larvae were exposed to insecticideacetone suspensions in water.Adult mosquitos tested in London showed no striking differences in susceptibility to DDT, though the median lethal concentration (MLC) of Culex pipiens molestus Forsk. (1·6 per cent.) was greater than the MLC of Aëdes aegypti (L.) (0·9), Anopheles maculipennis var. atroparvusvan Thiel (1·0), or A. quadrimaculatus Say (·7). C. p. molestus and Aë. aegypti showed the same order of susceptibility to dieldrin and BHC, with Anopheles m. atroparvus more susceptible to both insecticides.

scholarly journals North American Culex pipiens and Culex quinquefasciatus are competent vectors for Usutu virus

2018 ◽  
Vol 12 (8) ◽  
pp. e0006732 ◽  
Author(s):  
Christian L. Cook ◽  
Yan-Jang S. Huang ◽  
Amy C. Lyons ◽  
Barry W. Alto ◽  
Isik Unlu ◽  
...  
Keyword(s):  
Culex Quinquefasciatus ◽  
North American ◽  
Culex Pipiens ◽  
Usutu Virus
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