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https://www.readbyqxmd.com/read/28209433/surface-runoff-and-subsurface-tile-drain-losses-of-neonicotinoids-and-companion-herbicides-at-edge-of-field
#1
François Chrétien, Isabelle Giroux, Georges Thériault, Patrick Gagnon, Julie Corriveau
With their application as seed coatings, the use of neonicotinoid insecticides increased dramatically during the last decade. They are now frequently detected in aquatic ecosystems at concentrations susceptible to harm aquatic invertebrates at individual and population levels. This study intent was to document surface runoff and subsurface tile drain losses of two common neonicotinoids (thiamethoxam and clothianidin) compared to those of companion herbicides (atrazine, glyphosate, S-metolachlor and mesotrione) at the edge of a 22...
February 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28198464/sublethal-doses-of-imidacloprid-disrupt-sexual-communication-and-host-finding-in-a-parasitoid-wasp
#2
Lars Tappert, Tamara Pokorny, John Hofferberth, Joachim Ruther
Neonicotinoids are widely used insecticides, but their use is subject of debate because of their detrimental effects on pollinators. Little is known about the effect of neonicotinoids on other beneficial insects such as parasitoid wasps, which serve as natural enemies and are crucial for ecosystem functioning. Here we show that sublethal doses of the neonicotinoid imidacloprid impair sexual communication and host finding in the parasitoid wasp Nasonia vitripennis. Depending on the dose, treated females were less responsive to the male sex pheromone or unable to use it as a cue at all...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195678/biochemical-evaluation-of-interactions-between-synergistic-molecules-and-phase-i-enzymes-involved-in-insecticide-resistance-in-b-and-q-type-bemisia-tabaci-hemiptera-aleyrodidae
#3
Michela Panini, Francesco Tozzi, Christoph T Zimmer, Chris Bass, Linda Field, Valerio Borzatta, Emanuele Mazzoni, Graham Moores
BACKGROUND: Metabolic resistance is an important consideration in the whitefly Bemisia tabaci, where an esterase-based mechanism has been attributed to pyrethroid resistance and over expression of the cytochrome P450, CYP6CM1, has been correlated to resistance to imidacloprid and other neonicotinoids. RESULTS: In vitro interactions between putative synergists and CYP6CM1, B and Q-type esterases were investigated, and structure-activity relationship analyses allowed the identification of chemical structures capable of acting as inhibitors of esterase and oxidase activities...
February 13, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28188895/the-effects-of-neonicotinoid-exposure-on-embryonic-development-and-organ-mass-in-northern-bobwhite-quail-colinus-virginianus
#4
Amanda Gobeli, Dane Crossley, Jeff Johnson, Kelly Reyna
Since their emergence in the early 1990s, neonicotinoid use has increased exponentially to make them the world's most prevalent insecticides. Although there has been considerable research concerning the lethality of neonicotinoids, their sub-lethal and developmental effects are still being explored, especially with regards to non-mammalian species. The goal of this research was to investigate the effects of the neonicotinoid imidacloprid on the morphological and physiological development of northern bobwhite quail (Colinus virginianus)...
February 7, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28187830/lack-of-cross-resistance-between-neonicotinoids-and-sulfoxaflor-in-field-strains-of-q-biotype-of-whitefly-bemisia-tabaci-from-eastern-china
#5
Wenlong Wang, Shaoli Wang, Guangjie Han, Yuzhou Du, Jianjun Wang
Control of Bemisia tabaci has depended primarily and heavily on insecticides, especially neonicotinoids. The novel sulfoximine insecticide sulfoxaflor exhibits high potency against a broad range of sap-feeding insect species, including those resistant to neonicotinoids. The resistance levels of Q-biotype B. tabaci field strains collected from 8 locations in eastern China to neonicotinoids and sulfoxaflor were investigated, and single nucleotide polymorphisms (SNPs) of nicotinic acetylcholine receptor β1 subunit gene (Btβ1) were detected...
March 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28177236/degradation-dynamics-and-dietary-risk-assessments-of-two-neonicotinoid-insecticides-during-lonicera-japonica-planting-drying-and-tea-brewing-processes
#6
Qingkui Fang, Yanhong Shi, Haiqun Cao, Zhou Tong, Jinjing Xiao, Min Liao, Xiangwei Wu, Rimao Hua
The degradation dynamics and dietary risk assessments of thiamethoxam and thiacloprid during Lonicera japonica planting, drying and tea brewing processes were systematically investigated using high-performance liquid chromatography. The half-lives of thiamethoxam and thiacloprid were 1.0-4.1 d in the honeysuckle flowers and leaves, degradation rate constants k ranged from -0.169 to -0.696. And the safety interval time was 7 d. The sun- and oven-drying (70 °C) percent digestions were 59.4-81.0% for the residues, which were higher than the shade- and oven-drying percent at lower temperatures (30, 40, 50 and 60 °C, which ranged from 37...
February 8, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28176635/modes-of-action-resistance-and-toxicity-of-insecticides-targeting-nicotinic-acetylcholine-receptors
#7
Makoto Ihara, Steven D Buckingham, Kazuhiko Matsuda, David B Sattelle
Nicotinic acetylcholine receptors (nAChRs) are members of the cys-loop superfamily of ligand-gated ion channels (cys-loop LGICs) and mediate fast cholinergic synaptic transmission in the nervous system of insects. The completion of many insect genome projects has greatly enhanced our understanding of the individual subunits that make up nAChR gene families from an insect genetic model organism (Drosophila melanogaster), crop pests, disease vectors and beneficial (pollinator) species. In addition to considerable insect nAChR subunit diversity, individual subunits can be subject to alternative splicing and RNA editing and these post-transcriptional modifications can add significantly to the diversity of nAChR receptor subtypes...
February 6, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28168846/performance-of-honey-bee-colonies-under-a-long-lasting-dietary-exposure-to-sub-lethal-concentrations-of-the-neonicotinoid-insecticide-thiacloprid
#8
Reinhold Siede, Lena Faust, Marina D Meixner, Christian Maus, Bernd Grünewald, Ralph Büchler
BACKGROUND: Substantial honey bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sub-lethal concentrations of pesticides has been suggested to affect the performance of honey bee colonies. This study aims to elucidate the potential effects of a chronic exposure to sub-lethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to honey bee colonies in a three-year replicated colony feeding study...
February 7, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28163992/an-experiment-on-the-impact-of-a-neonicotinoid-pesticide-on-honeybees-the-value-of-a-formal-analysis-of-the-data
#9
Robert S Schick, Jeremy J D Greenwood, Stephen T Buckland
BACKGROUND: We assess the analysis of the data resulting from a field experiment conducted by Pilling et al. (PLoS ONE. doi: 10.1371/journal.pone.0077193, 5) on the potential effects of thiamethoxam on honeybees. The experiment had low levels of replication, so Pilling et al. concluded that formal statistical analysis would be misleading. This would be true if such an analysis merely comprised tests of statistical significance and if the investigators concluded that lack of significance meant little or no effect...
2017: Environmental Sciences Europe
https://www.readbyqxmd.com/read/28163990/authors-response-on-schick-et-al-2017-an-experiment-of-the-impact-of-a-neonicotinoid-pesticide-on-honey-bees-the-value-of-a-formal-analysis-of-the-data-environ-sci-eur-2017
#10
EDITORIAL
Peter Campbell, Mike Coulson, Keith Ward
Whilst a formal statistical analysis of any experimental data is always preferable in principle, in the case of Pilling et al. (PLoS ONE 8:e77193, 2013), it is hard to see how the results of any formal analysis-including those provided by Schick et al.-could be considered reliable. Regardless of the issue of statistical analysis, there was a wealth of valuable and novel biological and chemical residue data generated under field conditions of use in Pilling et al., which when taken into consideration alongside other relevant available published data and information (i...
2017: Environmental Sciences Europe
https://www.readbyqxmd.com/read/28145869/catching-up-with-popular-pesticides-more-human-health-studies-are-needed-on-neonicotinoids
#11
Nate Seltenrich
No abstract text is available yet for this article.
February 1, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28139069/evolution-of-imidacloprid-resistance-in-myzus-persicae-in-greece-and-susceptibility-data-for-spirotetramat
#12
Costas Ch Voudouris, Martin S Williamson, Panagiotis J Skouras, Amalia N Kati, Anastasia J Sahinoglou, John T Margaritopoulos
BACKGROUND: Myzus persicae s.l. is a major crop pest globally and has evolved resistance to a range of insecticide classes making it increasingly difficult to control in some areas. Here we compare bioassay monitoring data for two important compounds, imidacloprid and spirotetramat, on field samples/clones collected in Greece. RESULTS: A total of 122 aphid samples/clones from central and northern Greece were examined in dose-response bioassays with imidacloprid...
January 31, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28135666/the-combined-effects-of-a-monotonous-diet-and-exposure-to-thiamethoxam-on-the-performance-of-bumblebee-micro-colonies
#13
C Dance, C Botías, D Goulson
There is a pressing need to better understand the factors contributing to declines of wild pollinators such as bumblebees. Many different contributors have been postulated including: loss of flower-rich habitats and nesting sites; monotonous diets; impacts of invasive pathogens; exposure to pesticides such as neonicotinoids. Past research has tended to investigate the impacts of these stressors in isolation, despite the increasing recognition that bees are simultaneously exposed to a combination of stressors, with potentially additive or synergistic effects...
January 27, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28126277/weight-of-evidence-evaluation-of-a-network-of-adverse-outcome-pathways-linking-activation-of-the-nicotinic-acetylcholine-receptor-in-honey-bees-to-colony-death
#14
REVIEW
Carlie A LaLone, Daniel L Villeneuve, Judy Wu-Smart, Rebecca Y Milsk, Keith Sappington, Kristina V Garber, Justin Housenger, Gerald T Ankley
Ongoing honey bee (Apis mellifera) colony losses are of significant international concern because of the essential role these insects play in pollinating crops. Both chemical and non-chemical stressors have been implicated as possible contributors to colony failure; however, the potential role(s) of commonly-used neonicotinoid insecticides has emerged as particularly concerning. Neonicotinoids act on the nicotinic acetylcholine receptors (nAChRs) in the central nervous system to eliminate pest insects. However, mounting evidence indicates that neonicotinoids also may adversely affect beneficial pollinators, such as the honey bee, via impairments on learning and memory, and ultimately foraging success...
January 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28125739/analysis-of-differentially-expressed-genes-related-to-resistance-in-spinosad-and-neonicotinoid-resistant-musca-domestica-l-diptera-muscidae-strains
#15
Dorte H Højland, Michael Kristensen
BACKGROUND: The housefly is a global pest that has developed resistance to most insecticides applied against it. Resistance of the spinosad-resistant strain 791spin and the neonicotinoid-resistant 766b strain is believed to be due to metabolism. We investigate differentially expressed genes in these two resistant strains related to metabolism in comparison with an insecticide-susceptible reference strain. RESULTS: Genes involved in metabolism of xenobiotics were primarily up-regulated in resistant flies with some differences between resistant strains...
2017: PloS One
https://www.readbyqxmd.com/read/28119157/endocrine-disrupting-pesticides-impair-the-neuroendocrine-regulation-of-reproductive-behaviors-and-secondary-sexual-characters-of-red-munia-amandava-amandava
#16
Surya Prakash Pandey, Kazuyoshi Tsutsui, Banalata Mohanty
The exposure effects of two endocrine disrupting pesticides (EDPs), mancozeb/MCZ and imidacloprid/IMI of the group dithiocarbamate and neonicotinoid respectively, on reproductive behaviors and secondary sexual characters have been studied in a seasonally breeding wildlife bird, red munia (Amandava amandava). Adult male birds were exposed to both the pesticides individually (0.25% LD50 of each) as well as co-exposed (MIX-I: 0.25% LD50 of each and MIX-II: 0.5% LD50 of each) through food for 30d in preparatory (July-August) and breeding (September-October) phase of reproductive cycle...
January 21, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28117358/rna-interference-mediated-knockdown-of-the-hydroxyacid-oxoacid-transhydrogenase-gene-decreases-thiamethoxam-resistance-in-adults-of-the-whitefly-bemisia-tabaci
#17
Xin Yang, Wen Xie, Ru-Mei Li, Xiao-Mao Zhou, Shao-Li Wang, Qing-Jun Wu, Ni-Na Yang, Ji-Xing Xia, Ze-Zong Yang, Li-Tao Guo, Ya-Ting Liu, You-Jun Zhang
Bemisia tabaci has developed a high level of resistance to thiamethoxam, a second generation neonicotinoid insecticide that has been widely used to control this pest. In this study, we investigated whether hydroxyacid-oxoacid transhydrogenase (HOT) is involved in resistance to the neonicotinoid insecticide thiamethoxam in the whitefly. We cloned the full-length gene that encodes HOT in B. tabaci. Its cDNA contains a 1428-bp open reading frame encoding 475 amino acid residues. Then we evaluated the mRNA expression level of HOT in different developmental stages, and found HOT expression was significantly greater in thiamethoxam resistance adults than in thiamethoxam susceptible adults...
January 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28116641/multigeneration-toxicity-of-imidacloprid-and-thiacloprid-to-folsomia-candida
#18
Cornelis A M van Gestel, Claudia de Lima E Silva, Thao Lam, Jacco C Koekkoek, Marja H Lamoree, Rudo A Verweij
In a recent study, we showed that the springtail Folsomia candida was quite sensitive the neonicotinoid insecticides imidacloprid and thiacloprid. This study aimed at determining the toxicity of both compounds to F. candida following exposure over three generations, in natural LUFA 2.2 standard soil. In the first generation, imidacloprid was more toxic than thiacloprid, with LC50s of 0.44 and 9.0 mg/kg dry soil, respectively and EC50s of 0.29 and 1.5 mg/kg dry soil, respectively. The higher LC50/EC50 ratio suggests that thiacloprid has more effects on reproduction, while imidacloprid shows lethal toxicity to the springtails...
January 23, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28112233/dynamics-of-bemisia-tabaci-biotypes-and-insecticide-resistance-in-fujian-province-in-china-during-2005-2014
#19
Feng-Luan Yao, Yu Zheng, Xiao-Yan Huang, Xue-Ling Ding, Jian-Wei Zhao, Nicolas Desneux, Yu-Xian He, Qi-Yong Weng
The whitefly Bemisia tabaci (Gennadius) is an important agricultural insect pest worldwide. The B and Q biotypes are the two most predominant and devastating biotypes prevalent across China. However, there are few studies regarding the occurrence of the Q biotype in Fujian Province, China, where high insecticide resistance has been reported in the B biotype. Differences in some biological characteristics between the B and Q biotypes, especially insecticide resistance, are considered to affect the outcome of their competition...
January 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28107986/dispersive-solid-phase-extraction-using-polyaniline-modified-zeolite-nay-as-a-new-sorbent-for-multiresidue-analysis-of-pesticides-in-food-and-environmental-samples
#20
Prapha Arnnok, Nopbhasinthu Patdhanagul, Rodjana Burakham
The applicability of polyaniline (PANI)-modified zeolite NaY as a sorbent for multi-class pesticides extraction was investigated. The sorbent had a sorption capacity of 833mgkg(-1) sorbent and preconcentration factor of 42 in the mixture of twenty pesticides. The PANI-coated zeolite NaY was successfully created via oxidative polymerization of aniline onto the surface of the zeolite. The sorbent was applied for dispersive solid phase extraction (DSPE) of commonly used pesticides belonging to five different chemical groups, involving carbamate, organophosphate, sulfonylurea, pyrethroid and neonicotinoid...
March 1, 2017: Talanta
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