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insecticid resistance

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https://www.readbyqxmd.com/read/28650966/insecticide-resistance-to-permethrin-and-malathion-and-associated-mechanisms-in-aedes-aegypti-mosquitoes-from-st-andrew-jamaica
#1
Sheena Francis, Karla Saavedra-Rodriguez, Rushika Perera, Mark Paine, William C Black, Rupika Delgoda
The emergence of novel diseases spread by the Aedes aegypti mosquito in Jamaica and the Caribbean, has prompted studies on insecticide resistance towards effective management of the vector. Though Jamaica has been using the organophosphate insecticide malathion in its vector control program for more than 30 years, resistance to the pesticide has not been tested in over a decade. We analyzed resistance to malathion and the pyrethroid insecticide, permethrin on mosquitoes collected across St. Andrew, Jamaica, and analyzed the molecular basis of resistance...
2017: PloS One
https://www.readbyqxmd.com/read/28648613/multiple-mechanisms-of-resistance-to-pyrethroids-in-anopheles-gambiae-s-l-populations-in-niger
#2
H Soumaila, M Idrissa, M Akgobeto, G Habi, H Jackou, I Sabiti, A Abdoulaye, A Daouda, I Souleymane, R Osse
INTRODUCTION: We performed a transversal study to map resistance of malaria vectors (Anopheles mosquitoes) to insecticides in Niger within the frame of the National Malaria Control Program funded by the World Health Organization (WHO). METHOD: Larvae of Anopheles gambiae s.l were collected from November to December 2013 in seven locations selected on the basis of different patterns of use of insecticides and environment. WHO susceptibility test tubes were used on females Anopheles to detect resistance to insecticides...
June 22, 2017: Médecine et Maladies Infectieuses
https://www.readbyqxmd.com/read/28646525/preliminary-characterization-of-putative-structural-cuticular-proteins-in-the-malaria-vector-anopheles-sinensis
#3
Dan Zhou, Baiyun Duan, Yan Sun, Lei Ma, Changliang Zhu, Bo Shen
BACKGROUND: The insect cuticle protects against environmental stresses such as insecticides, physical injury, dehydration and pathogenic microorganisms. Structural cuticular proteins (CPs) are the primary components, and are of interest for physiology-based pest management methods. Anopheles sinensis CPs are poorly characterised at present, therefore we performed whole genome sequence analysis and re-analysed available transcriptome data to identify potential insecticide resistance-associated CPs...
June 23, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28640344/screening-of-plant-extracts-and-fractions-on-aedes-aegypti-larvae-found-in-the-state-of-mato-grosso-do-sul-linnaeus-1762-culicidae
#4
Karla R DE Andrade Porto, Priscilla R Motti, Mami Yano, Antonia R Roel, Claudia A L Cardoso, Rosemary Matias
The constant use of chemical insecticides for Aedes aegypti control has caused resistance in the mosquito populations. Thus, the objective of this study was to analyze the larvicidal potential of extracts and fractions of plants on A. aegypti larvae. The analysis included sixty one extracts and twenty five fractions of fifty botanical species at concentrations of 0.25; 0.12; 0.06 to 0.03 mg mL-1; 4 replications and one negative control of dechlorinate water and 1% DMSO; and a positive control with rotenone...
April 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28638403/jaburetox-update-on-a-urease-derived-peptide
#5
REVIEW
Arlete Beatriz Becker-Ritt, Camila Saretta Portugal, Célia Regina Carlini
Urease from Canavalia ensiformis seeds was the first enzyme ever to be crystallized, in 1926. These proteins, found in plants, bacteria and fungi, present different biological properties including catalytic hydrolysis of urea, and also enzyme-independent activities, such as induction of exocytosis, pro-inflammatory effects, neurotoxicity, antifungal and insecticidal properties. Urease is toxic to insects and fungi per se but part of this toxicity relies on an internal peptide (~11 kDa), which is released upon digestion of the protein by insect enzymes...
2017: Journal of Venomous Animals and Toxins Including Tropical Diseases
https://www.readbyqxmd.com/read/28637430/malaria-control-by-commodities-without-practical-malariology
#6
J Kevin Baird
Malaria remains a serious clinical and public health problem, the object of an ongoing technological and humanitarian struggle to abate the very substantial harm done. The manner by which humanity approached malaria control changed abruptly and profoundly after 1945 with the advent of the insecticide DDT. Malariologists in the first half of the twentieth century conceived precise modifications to natural or man-made environments aimed at making those less hospitable to specific anopheline mosquito vector species...
June 21, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28637377/the-candidatus-liberibacter-host-interface-insights-into-pathogenesis-mechanisms-and-disease-control
#7
Nian Wang, Elizabeth A Pierson, João Carlos Setubal, Jin Xu, Julien G Levy, Yunzeng Zhang, Jinyun Li, Luiz Thiberio Rangel, Joaquim Martins
"Candidatus Liberibacter" species are associated with economically devastating diseases of citrus, potato, and many other crops. The importance of these diseases as well as the proliferation of new diseases on a wider host range is likely to increase as the insects vectoring the "Ca. Liberibacter" species expand their territories worldwide. Here, we review the progress on understanding pathogenesis mechanisms of "Ca. Liberibacter" species and the control approaches for diseases they cause. We discuss the Liberibacter virulence traits, including secretion systems, putative effectors, and lipopolysaccharides (LPSs), as well as other important traits likely to contribute to disease development, e...
June 21, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28636268/high-throughput-sequencing-reveals-drosophila-suzukii-responses-to-insecticides
#8
Ruchir Mishra, Joanna C Chiu, Gang Hua, Nilesh R Tawari, Michael J Adang, Ashfaq A Sial
Global climate change and acquired resistance to insecticides are threats to world food security. Drosophila suzukii, a devastating invasive pest in many parts of the world, causes substantial economic losses to fruit production industries, forcing farmers to apply broad-spectrum insecticides frequently. This could lead to the development of insecticide resistance. We determined the Lethal Concentration50 (median lethal concentration) values of zeta-cypermethrin, spinosad, and malathion insecticides against D...
June 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28632769/combining-omics-and-microscopy-to-visualize-interactions-between-the-asian-citrus-psyllid-vector-and-the-huanglongbing-pathogen-candidatus-liberibacter-asiaticus-in-the-insect-gut
#9
Angela Kruse, Somayeh Fattah-Hosseini, Surya Saha, Richard Johnson, EricaRose Warwick, Kasie Sturgeon, Lukas Mueller, Michael J MacCoss, Robert G Shatters, Michelle Cilia Heck
Huanglongbing, or citrus greening disease, is an economically devastating bacterial disease of citrus. It is associated with infection by the gram-negative bacterium Candidatus Liberibacter asiaticus (CLas). CLas is transmitted by Diaphorina citri, the Asian citrus psyllid (ACP). For insect transmission to occur, CLas must be ingested during feeding on infected phloem sap and cross the gut barrier to gain entry into the insect vector. To investigate the effects of CLas exposure at the gut-pathogen interface, we performed RNAseq and mass spectrometry-based proteomics to analyze the transcriptome and proteome, respectively, of ACP gut tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28628635/cross-resistance-and-synergism-bioassays-suggest-multiple-mechanisms-of-pyrethroid-resistance-in-western-corn-rootworm-populations
#10
Adriano E Pereira, Dariane Souza, Sarah N Zukoff, Lance J Meinke, Blair D Siegfried
Recently, resistance to the pyrethroid bifenthrin was detected and confirmed in field populations of western corn rootworm, Diabrotica virgifera virgifera LeConte from southwestern areas of Nebraska and Kansas. As a first step to understand potential mechanisms of resistance, the objectives of this study were i) to assess adult mortality at diagnostic concentration-LC99 to the pyrethroids bifenthrin and tefluthrin as well as DDT, ii) estimate adult and larval susceptibility to the same compounds as well as the organophosphate methyl-parathion, and iii) perform synergism experiments with piperonyl butoxide (PBO) (P450 inhibitor) and S,S,S-tributyl-phosphorotrithioate (DEF) (esterase inhibitor) in field populations...
2017: PloS One
https://www.readbyqxmd.com/read/28626931/insecticide-resistance-and-intracellular-proteases
#11
REVIEW
Richard M Wilkins
Pesticide resistance is an example of evolution in action with mechanisms of resistance arising from mutations or increased expression of intrinsic genes. Intracellular proteases have a key role in maintaining healthy cells and in responding to stressors such as pesticides. Insecticide resistant insects have constitutively elevated intracellular protease activity when compared to corresponding susceptible strains. This increase was shown for some cases originally through biochemical enzyme studies and subsequently putatively by transcriptomics and proteomics methods...
June 19, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28625668/towards-area-wide-management-of-insect-vectored-viruses-of-tomatoes-in-the-bowen-district
#12
P R Campbell, J E Cremer, R L Roach, V Steele, S Subramaniam, V Sivasubramaniam, C Monsour, T Mullins, D M Persley, C F Gambley
The Bowen region of Northern Queensland is an important winter production area for tomatoes in Australia. There are three economically important viruses in the region that affect tomato, Tomato yellow leaf curl virus (TYLCV), Tomato spotted wilt virus (TSWV) and Potato leafroll virus (PLRV), which are vectored by whiteflies, thrips and aphids, respectively. An area wide management approach is required to lower the primary inoculum throughout the district. To this end, we undertook investigations into the virus incidence and alternative hosts for the virus and vectors in different cropping regions throughout the district, as well as local management options such as insecticide application and possible non-host cover crops for the wet-season break in production...
June 15, 2017: Virus Research
https://www.readbyqxmd.com/read/28625474/identifying-circumstances-under-which-high-insecticide-dose-increases-or-decreases-resistance-selection
#13
J C Helps, N D Paveley, F van den Bosch
Insect management strategies for agricultural crop pests must reduce selection for insecticide resistant mutants while providing effective control of the insect pest. One management strategy that has long been advocated is the application of insecticides at the maximum permitted dose. This has been found, under some circumstances, to be able to prevent the resistance allele frequency from increasing. However this approach may, under different circumstances, lead to rapid selection for resistance to the insecticide...
June 15, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28623302/insecticide-susceptibility-of-anopheles-mosquitoes-changes-in-response-to-variations-in-the-larval-environment
#14
Henry F Owusu, Nakul Chitnis, Pie Müller
Insecticide resistance threatens the success achieved through vector control in reducing the burden of malaria. An understanding of insecticide resistance mechanisms would help to develop novel tools and strategies to restore the efficacy of insecticides. Although we have substantially improved our understanding of the genetic basis of insecticide resistance over the last decade, we still know little of how environmental variations influence the mosquito phenotype. Here, we measured how variations in larval rearing conditions change the insecticide susceptibility phenotype of adult Anopheles mosquitoes...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28619089/light-manipulation-of-mosquito-behaviour-acute-and-sustained-photic-suppression-of-biting-activity-in-the-anopheles-gambiae-malaria-mosquito
#15
Aaron D Sheppard, Samuel S C Rund, Gary F George, Erin Clark, Dominic J Acri, Giles E Duffield
BACKGROUND: Host-seeking behaviours in anopheline mosquitoes are time-of-day specific, with a greater propensity for nocturnal biting. We investigated how a short exposure to light presented during the night or late day can inhibit biting activity and modulate flight activity behaviour. RESULTS: Anopheles gambiae (s.s.), maintained on a 12:12 LD cycle, were exposed transiently to white light for 10-min at the onset of night and the proportion taking a blood meal in a human biting assay was recorded every 2 h over an 8-h duration...
June 16, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28611355/improved-efficacy-of-an-arthropod-toxin-expressing-fungus-against-insecticide-resistant-malaria-vector-mosquitoes
#16
Etienne Bilgo, Brian Lovett, Weiguo Fang, Niraj Bende, Glenn F King, Abdoulaye Diabate, Raymond J St Leger
The continued success of malaria control efforts requires the development, study and implementation of new technologies that circumvent insecticide resistance. We previously demonstrated that fungal pathogens can provide an effective delivery system for mosquitocidal or malariacidal biomolecules. Here we compared genes from arthropod predators encoding insect specific sodium, potassium and calcium channel blockers for their ability to improve the efficacy of Metarhizium against wild-caught, insecticide-resistant anophelines...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28608990/a-transgenic-strategy-for-controlling-plant-bugs-adelphocoris-suturalis-through-expression-of-double-stranded-rna-homologous-to-fatty-acyl-coenzyme-a-reductase-in-cotton
#17
Jing Luo, Sijia Liang, Jianying Li, Zhongping Xu, Lun Li, Bangqin Zhu, Zhe Li, Chaoliang Lei, Keith Lindsey, Lizhen Chen, Shuangxia Jin, Xianlong Zhang
Plant bugs (Miridae species), which are sap-sucking insects, have emerged as major pests of cotton in China. Most Miridae species are not sensitive to commercial Bacillus thuringiensis (Bt) cotton, resulting in significant economic losses and an increased application of insecticide, which eventually may compromise the future of Bt cotton. We demonstrate that FATTY ACYL-COA REDUCTASE (AsFAR) plays an essential role in the reproduction of the bug Adelphocoris suturalis. Down-regulation of AsFAR expression by injection of double-stranded RNA suppresses ovarian development and female fertility, resulting in females producing few viable offspring...
June 13, 2017: New Phytologist
https://www.readbyqxmd.com/read/28608751/molecular-modelling-studies-of-kdr-mutations-in-voltage-gated-sodium-channel-revealed-significant-conformational-variations-contributing-to-insecticide-resistance
#18
Nanda Kumar Yellapu, Jeyakodi Gopal, Gunasekaran Kasinahtan, Jambulingam Purushothaman
Voltage gated sodium channels (VGSC) of mosquito vectors are the primary targets of DDT and other synthetic pyrethroids used in public health programs. The knockdown resistant (kdr) mutations in VGSC are associated with the insecticide resistance especially in Anophelines. The present study is aimed to emphasize and demarcate the impact of three kdr-mutations such as L1014S, L1014F and L1014H on insecticide resistance. The membrane model of sodium transport domain of VGSC (STD-VGSC) was constructed using de novo approach based on domain and trans-membrane predictions...
June 13, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28608057/cuticle-genes-cpcpr63-and-cpcpr47-may-confer-resistance-to-deltamethrin-in-culex-pipiens-pallens
#19
Xueli Sun, Juxin Guo, Wenyun Ye, Qin Guo, Yun Huang, Lei Ma, Dan Zhou, Bo Shen, Yan Sun, Changliang Zhu
Cuticular proteins (CPs) are implicated in insecticide resistance in mosquito populations. Here, we investigated the role of cuticular genes in regulation of insecticide resistance in Culex pipiens pallens. We identified two CpCPRs (CpCPR63 and CpCPR47) that exhibited higher transcript levels in pyrethroid-resistant strains than in susceptible strains. Mosquito mortality was increased after knockdown of CpCPR genes by dsRNA injection. The RNA interference experiment suggested an interaction between CpCPR63 and CpCPR47, as silencing of one gene resulted in decreased expression of the other...
June 12, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28607407/resistance-of-garlic-cultivars-to-bradysia-odoriphaga-and-its-correlation-with-garlic-thiosulfinates
#20
Guodong Zhu, Yin Luo, Ming Xue, Fangyuan Zhou, Haipeng Zhao, Guixia Ji, Fang Liu
Garlic, a widely cultivated global vegetable crop, is threatened by the underground pest Bradysia odoriphaga in China. Previous reports indicated that garlic essential oil, of which the dominant components are sulfides or thiosulfinates, exhibits insecticidal activity against pests. However, it is unclear whether the resistance of garlic to B. odoriphaga is related to thiosulfinates. Here, we compared the resistance of 10 garlic cultivars at various growth stages to B. odoriphaga by field investigation and indoor life-table data collection...
June 12, 2017: Scientific Reports
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