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Richard Odemer, Lisa Nilles, Nadine Linder, Peter Rosenkranz
Neonicotinoids alone or in combination with pathogens are considered to be involved in the worldwide weakening of honey bees. We here present a new approach for testing sublethal and/or synergistic effects in free flying colonies. In our experiment individually marked honey bees were kept in free flying mini-hives and chronically exposed to sublethal doses of the neonicotinoid clothianidin. Additional groups of bees were challenged with Nosema infections or with combinations of the pesticide and pathogens. Longevity and flight activity of the differentially treated bees were monitored for a period of 18 days...
March 19, 2018: Ecotoxicology
Kate Basley, Dave Goulson
Arable field margins are often sown with wildflowers to encourage pollinators and other beneficial or desirable insects such as bees and butterflies. Concern has been raised that these margins may be contaminated with systemic pesticides such as neonicotinoids used on the adjacent crop, and that this may negatively impact beneficial insects. The use of neonicotinoids has been linked to butterfly declines, and species such as the common blue butterfly ( Polyommatus icarus) that feed upon legumes commonly sown in arable field margins, may be exposed to such toxins...
March 19, 2018: Environmental Science & Technology
Vivek Kumar, Antonio Francis, Pasco B Avery, Cindy L McKenzie, Lance S Osborne
Rugose spiraling whitefly (RSW), Aleurodicus rugioperculatus Martin (Hemiptera: Aleyrodidae) is a new invasive whitefly pest in the Florida landscape, known to feed on a wide range of plants including palms, woody ornamentals, shrubs, and fruits. With the objective to find an alternative to neonicotinoid insecticides, and develop an ecofriendly management program for RSW, in the current study we evaluated the efficacy of a biopesticide containing the entomopathogenic fungi, Isaria fumosorosea Wize (Hypocreales: Clavicipitaceae), and an insect growth regulator buprofezin applied alone and in combination under laboratory and field conditions...
March 13, 2018: Journal of Economic Entomology
Adrienne J Bartlett, Amanda M Hedges, Kyna D Intini, Lisa R Brown, France J Maisonneuve, Stacey A Robinson, Patricia L Gillis, Shane R de Solla
Neonicotinoid insecticides are environmentally persistent and highly water-soluble, and thus are prone to leaching into surface waters where they may negatively affect non-target aquatic insects. Most of the research to date has focused on imidacloprid, and few data are available regarding the effects of other neonicotinoids or their proposed replacements (butenolide insecticides). The objective of this study was to assess the toxicity of six neonicotinoids (imidacloprid, thiamethoxam, acetamiprid, clothianidin, thiacloprid, and dinotefuran) and one butenolide (flupyradifurone) to Hexagenia spp...
March 12, 2018: Environmental Pollution
Jesse C Miles, Jessica Hua, Maria S Sepulveda, Christian H Krupke, Jason T Hoverman
[This corrects the article DOI: 10.1371/journal.pone.0174171.].
2018: PloS One
Yusuf Çamlıca, Salih Cüfer Bediz, Ülkü Çömelekoğlu, Şakir Necat Yilmaz
In this study, the effects of a neonicotinoid insecticide acetamiprid on the sciatic nerve of Rana ridibunda were investigated by using electrophysiological and histological methods. A total of 35 preparations of sciatic nerve isolated from 35 frogs (Nervus ischiadicus) were used in the experiments. Experiments were designed as four different dose groups (n = 8 per group). Acetamiprid solutions of 1 (group 1), 10 (group 2), 100 (group 3), and 1000 µM (group 4) were applied to the nerves in dose groups...
March 14, 2018: Drug and Chemical Toxicology
Damon A D'Ambrosio, Anders S Huseth, George G Kennedy
BACKGROUND: Reports of neonicotinoid seed treatment (NST) failure against Frankliniella fusca in the Mid-South and Southeastern United States led to the discovery of widespread resistance in these insect populations. Previous studies of NSTs in other crops have shown the concentration of the insecticide to change over time, which could reduce its efficacy. To understand this relationship in cotton with F. fusca, our study examined how plant age alters the effects of NSTs (imidacloprid, imidacloprid+thiodicarb, thiamethoxam) by examining larval establishment at multiple seedling ages during the period of cotton seedling susceptibility to this insect...
March 13, 2018: Pest Management Science
Ying Zhou, Xiaoxia Lu, Xiaofang Fu, Bo Yu, Dan Wang, Cheng Zhao, Qi Zhang, Ying Tan, Xinyi Wang
A method for simultaneous measure of nine neonicotinoid insecticide residues in soil was developed by using liquid chromatography-tandem mass spectrometry (LC-MS/MS) coupled with a quick pretreatment procedure. The soil was extracted with a mixture of acetonitrile and dichloromethane (1:2, v:v) and cleaned up with Primary Secondary Amine (PSA). Matrix-matched standards were prepared to eliminate the interference of the matrix. The LC-MS/MS conditions were optimized to separate the nine neonicotinoids within 6...
August 3, 2018: Analytica Chimica Acta
Rodrigo Cupertino Bernardes, Wagner Faria Barbosa, Gustavo Ferreira Martins, Maria Augusta Pereira Lima
Large-scale pesticide application poses a major threat to bee biodiversity by causing a decline in bee populations that, in turn, compromises ecosystem maintenance and agricultural productivity. Biopesticides are considered an alternative to synthetic pesticides with a focus on reducing potential detrimental effects to beneficial organisms such as bees. The production of healthy queen stingless bees is essential for the survival and reproduction of hives, although it remains unknown whether biopesticides influence stingless bee reproduction...
March 6, 2018: Chemosphere
Luca Maria Chiesa, Sara Panseri, Maria Nobile, Federica Ceriani, Francesco Arioli
Demand for honey is increasing, especially if it is organic and if its nutritional properties are linked to untreated environments in order to guarantee quality for health. Sources of contamination of honey can be divided into environmental and apicultural Therefore, the distribution of POPs (persistent organic pollutants), pesticides and antibiotic residues from geographical areas with different contamination sources (high anthropic impact, intensive farming, husbandry and low anthropic impact) was investigated in order to confirm the potential transfer of xenobiotics into the supply chain and to give beekeepers tools for the selection of areas dedicated to organic production...
March 13, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Minae Watanabe, Jun Ueyama, Eiji Ueno, Yuko Ueda, Masaya Oda, Yuko Umemura, Takashi Tanahashi, Yoshitomo Ikai, Isao Saito
Dinotefuran is an insecticide belonging to the neonicotinoid class, which is frequently used to control pests in paddy rice owing to its permeability and effectiveness against sucking insects. Since 2002, this insecticide has been commercially available in Japan, and has become controversial due to its high detection frequency in brown rice for primary consumption. In this study, the effects of processing and cooking on the reduction of dinotefuran residues in commercially available brown rice were investigated...
March 13, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Jiangong Jiang, Dicheng Ma, Nan Zou, Xin Yu, Zhengqun Zhang, Feng Liu, Wei Mu
Neonicotinoid insecticides (NIs) have recently been recognized as co-factors in the decline of honeybee colonies because most neonicotinoids are systemic and can transfer into the pollen and nectar of many pollinated crops. In this study, we collected pollen, nectar and leaves from a cotton crop treated with imidacloprid and thiamethoxam to measure the residue levels of these two NIs at different application doses during the flowering period. Then, the residual data were used to assess the risk posed by the systemic insecticides to honeybees following mandated methods published by the European Food Safety Authority (EFSA), and a highly toxic risk to honeybees was highlighted...
February 27, 2018: Chemosphere
Suzhen Qi, Donghui Wang, Lizhen Zhu, Miaomiao Teng, Chengju Wang, Xiaofeng Xue, Liming Wu
Cycloxaprid (CYC) is a novel neonicotinoid insecticide with high activity against resistant pests but is safe for mammals. The toxic effects of CYC on earthworms (Eisenia fetida) were studied in this paper. The 14-day exposure results showed that CYC is potentially toxic to earthworms, with a 14d-LC50 of 10.21 mg/kgdry soil , and that it induced tissue damage to the epidermis, gut, and neurochord at sublethal doses. During a 21-day exposure, CYC induced oxidative stress in earthworms, and both enzyme activities of catalase (CAT) and superoxide dismutase (SOD) were impacted...
March 9, 2018: Environmental Science and Pollution Research International
Tadashi Takada, Naoki Yoneda, Tetsushi Hirano, Shogo Yanai, Anzu Yamamoto, Youhei Mantani, Toshifumi Yokoyama, Hiroshi Kitagawa, Yoshiaki Tabuchi, Nobuhiko Hoshi
It has been suggested that an increase in the use of pesticides affects neurodevelopment, but there has been no animal experiment showing a causal relation between neonicotinoid pesticides (NNs) and depression. We examined whether dinotefuran (DIN), the most widely used NN in Japan, induces depression. Male mice were administered DIN between 3 and 8 weeks of age, referring to the no-observed-effect level (NOEL). The mice were then subjected to a tail suspension test (TST) and a forced swimming test (FST). After these tests, their brains were dissected for immunohistochemical analyses of serotonin (5-HT)...
March 8, 2018: Journal of Veterinary Medical Science
Yong Li, Ling Long, Huangqian Yan, Jing Ge, Jinjin Cheng, Lijun Ren, Xiangyang Yu
The accumulation of pesticides in vegetables may have serious effects on human health and ecosystems via food chains; therefore, it is of great importance to investigate the uptake and accumulation behaviours of pesticides in vegetable tissues. In the present study, the uptake, translocation and accumulation of five neonicotinoids, thiamethoxam (THIM), clothianidin (CLO), thiacloprid (THID), acetamiprid (ACE) and dinotefuran (DIN), in komatsuna (Brassica rapa var. perviridis, a vegetable) were investigated...
February 20, 2018: Chemosphere
Juan Manuel Montiel-León, Sung Vo Duy, Gabriel Munoz, Marc Amyot, Sébastien Sauvé
A study was initiated to investigate a fast and reliable method for the determination of selected systemic insecticides in water matrixes and to evaluate potential sources of bias in their analysis. Acetamiprid, clothianidin, desnitro-imidacloprid, dinotefuran, fipronil, imidacloprid, nitenpyram, thiacloprid, and thiamethoxam were amenable to analysis via on-line sample enrichment hyphenated to ultra-high-performance liquid chromatography tandem mass spectrometry. The selection of on-line solid-phase extraction parameters was dictated by a multicriterion desirability approach...
March 5, 2018: Analytical and Bioanalytical Chemistry
Alice Ruckert, L Niel Allen, Ricardo A Ramirez
Spider mites, a cosmopolitan pest of agricultural and landscape plants, thrive under hot and dry conditions, which could become more frequent and extreme due to climate change. Recent work has shown that neonicotinoids, a widely used class of systemic insecticides that have come under scrutiny for non-target effects, can elevate spider mite populations. Both water-stress and neonicotinoids independently alter plant resistance against herbivores. Yet, the interaction between these two factors on spider mites is unclear, particularly for Banks grass mite (Oligonychus pratensis; BGM)...
2018: PloS One
Xue Dong Chen, Torrence A Gill, Chi D Nguyen, Nabil Killiny, Kirsten S Pelz-Stelinski, Lukasz L Stelinski
The Asian citrus psyllid (Diaphorina citri Kuwayama) is known to exhibit abdominal color polymorphisms. In the current study, susceptibility to four insecticides was compared among orange/yellow, blue/green and gray/brown color morphs of field collected D. citri. The LD50 values and 95% fiducial limits were quantified for each insecticide and color morph combination and ranged between 0.32 ng/μL (0.18-0.56) and 6.16 ng/μL (3.30-12.50). Second, we measured the detoxification enzyme activity levels of orange/yellow, blue/green and gray/brown color morphs for cytochrome P450, glutathione S-transferase, and general esterase...
February 27, 2018: Insect Science
Zülal Atlı Şekeroğlu, Vedat Şekeroğlu, Ebru Uçgun, Seval Kontaş Yedier, Birsen Aydın
Clothianidin (CHN) is a broad-spectrum neonicotinoid insecticide. Limited studies have been carried out on the cytotoxic and genotoxic effects of both CHN using different genotoxicity tests in human cells with or without human metabolic activation system (S9 mix). Therefore, the aim of this study is to investigate the cytotoxic and genotoxic effects of CHN and its metabolites on human lymphocyte cultures with or without S9 mix using chromosomal aberration (CA) and micronucleus (MN) tests. The cultures were treated with 25, 50, and 100 µg/ml of CHN in the presence (3 h treatment) and absence (48 h treatment) of S9 mix...
February 26, 2018: Drug and Chemical Toxicology
Michelle L Hladik, Anson Main, Dave Goulson
Neonicotinoid use has increased rapidly in recent years, with a global shift towards insecticide applications as seed coatings rather than aerial spraying. While the use of seed coatings can lessen the amount of overspray and drift, the near universal and prophylactic use of neonicotinoid seed coatings on major agricultural crops has led to widespread detections in the environment (pollen, soil, water, honey). Pollinators and aquatic insects appear to be especially susceptible to the effects of neonicotinoids with current research suggesting that chronic sub-lethal effects are more prevalent than acute toxicity...
February 26, 2018: Environmental Science & Technology
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