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https://www.readbyqxmd.com/read/28600692/simultaneous-determination-of-pyrethroids-and-pyrethrins-by-dispersive-liquid-liquid-microextraction-and-liquid-chromatography-triple-quadrupole-mass-spectrometry-in-environmental-samples
#1
Alexander Ccanccapa-Cartagena, Ana Masiá, Yolanda Picó
A simple and environmentally friendly dispersive liquid-liquid microextraction (DLLME) method coupled with electrospray ionization liquid chromatography triple quadrupole mass spectrometry (LC-QqQ-MS/MS) was developed for the simultaneous determination of 17 synthetic and natural pyrethroids. A comparison of solid-phase extraction (SPE) versus DLLME for water samples and only "dilute and shoot" versus the additional extract cleanup by DLLME for sediment samples is reported. Chloroform was the extracting solvent in the DLLME technique for both water and sediment samples...
June 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28505888/fipronil-washoff-to-municipal-wastewater-from-dogs-treated-with-spot-on-products
#2
Jennifer Teerlink, Jorge Hernandez, Robert Budd
Fipronil and fipronil degradates have been reported in treated wastewater effluent at concentrations that exceed USEPA Aquatic Life Benchmarks, posing a potential risk to the surface waters to which they discharge. Fipronil is a common insecticide found in spot-on flea and tick treatment products that have the potential for down-the-drain transport and direct washoff into surface water. Volunteers currently treating their dogs with a fipronil-containing spot-on product were recruited. Dogs were washed either 2, 7, or 28days after product application, and rinsate from 34 discrete bathing events were analyzed by LC-MS/MS for fipronil and fipronil degradates (collectively known as fiproles)...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28439681/side-effects-of-pesticides-used-in-irrigated-rice-areas-on-telenomus-podisi-ashmead-hymenoptera-platygastridae
#3
Juliano de Bastos Pazini, Rafael Antonio Pasini, Enio Júnior Seidel, Matheus Rakes, José Francisco da Silva Martins, Anderson Dionei Grützmacher
Telenomus podisi Ashmead (Hymenoptera: Platygastridae) is an important agent for the biological control of stink bug eggs in irrigated rice areas and the best strategy for its preservation is the use of selective pesticides. The aim of this study was to know the side-effects of pesticides used in Brazilian irrigated rice areas on egg parasitoid T. podisi. We evaluated, under laboratory conditions, 13 insecticides, 11 fungicides, 11 herbicides, and a control (distilled water) in choice and no-choice tests. In the no-choice tests, the pesticides were sprayed at pre and post-parasitism stages (egg and larval stages of T...
April 24, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28406073/rapid-multiresidue-determination-of-pesticides-in-livestock-muscle-and-liver-tissue-via-modified-quechers-sample-preparation-and-lc-ms-ms
#4
K Hamamoto, K Iwatsuki, R Akama, R Koike
Many multiresidue methods for the determination of pesticides in vegetables and fruits have been reported to date. However, few such methods have been employed to investigate pesticide residues in animal tissue. In this study, an LC-MS/MS multiresidue method coupled with modified QuEChERS extraction was developed and validated for the investigation of eight pesticide residues: prallethrin (PR), resmethrin (RMT), imidacloprid (IMC), diflubenzuron (DFB), cyromazine (CYR), etofenprox (EFP), dinotefuran (DNT) and phthalthrin (PTLT)...
May 17, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28399272/baseline-insecticide-susceptibility-screening-against-six-active-ingredients-for-culex-and-aedes-diptera-culicidae-mosquitoes-in-the-united-states
#5
Stephanie L Richards, Jo Anne G Balanay, Melinda Fields, Kurt Vandock
Mosquitoes may develop resistance to insecticide active ingredients (AI). Thus, mosquitoes should be tested for resistance to confirm efficacy of insecticide-based control, inform management decisions, and protect public and environmental health. Our objectives were to determine a baseline of resistance for six AIs used in mosquito control in the United States to assess how resistance differs between mosquito collection location, AI, and mosquito species (container-ovipositing Aedes and Culex that may oviposit in containers or other sources)...
May 1, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28372842/comparison-of-green-sample-preparation-techniques-in-the-analysis-of-pyrethrins-and-pyrethroids-in-baby-food-by-liquid-chromatography-tandem-mass-spectrometry
#6
COMPARATIVE STUDY
Mateus Henrique Petrarca, Alexander Ccanccapa-Cartagena, Ana Masiá, Helena Teixeira Godoy, Yolanda Picó
A new selective and sensitive liquid chromatography triple quadrupole mass spectrometry method was developed for simultaneous analysis of natural pyrethrins and synthetic pyrethroids residues in baby food. In this study, two sample preparation methods based on ultrasound-assisted dispersive liquid-liquid microextraction (UA-DLLME) and salting-out assisted liquid-liquid extraction (SALLE) were optimized, and then, compared regarding the performance criteria. Appropriate linearity in solvent and matrix-based calibrations, and suitable recoveries (75-120%) and precision (RSD values≤16%) were achieved for selected analytes by any of the sample preparation procedures...
May 12, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28187826/metabolic-resistance-in-nilaparvata-lugens-to-etofenprox-a-non-ester-pyrethroid-insecticide
#7
Huahua Sun, Baojun Yang, Yixi Zhang, Zewen Liu
Etofenprox, a non-ester pyrethroid insecticide, will be registered to control rice pests such as the brown planthopper (BPH, Nilaparvata lugens Stål) in mainland China. Insecticide resistance is always a problem to the effective control of N. lugens by chemical insecticides. An etofenprox resistance selection of N. lugens was performed in order to understand the related mechanisms. Through successive selection by etofenprox for 16 generations in the laboratory, an etofenprox-resistant strain (G16) with the resistance ratio (RR) of 422...
March 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28168834/pyrethroids-and-ddt-tolerance-of-anopheles-gambiae-s-l-from-sengerema-district-an-area-of-intensive-pesticide-usage-in-north-western-tanzania
#8
Anitha Philbert, Sylvester Leonard Lyantagaye, Gabriele Pradel, Che Julius Ngwa, Gamba Nkwengulila
OBJECTIVE: To assess the susceptibility status of malaria vectors to pyrethroids and dichlorodiphenyltrichloroethane (DDT), characterise the mechanisms underlying resistance and evaluate the role of agro-chemical use in resistance selection among malaria vectors in Sengerema agro-ecosystem zone, Tanzania. METHODS: Mosquito larvae were collected from farms and reared to obtain adults. The susceptibility status of An. gambiae s.l. was assessed using WHO bioassay tests to permethrin, deltamethrin, lambdacyhalothrin, etofenprox, cyfluthrin and DDT...
April 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28032101/current-susceptibility-status-of-anopheles-stephensi-diptera-culicidae-to-different-imagicides-in-a-malarious-area-southeastern-of-iran
#9
Mohammad Amin Gorouhi, Hassan Vatandoost, Mohammad Ali Oshaghi, Ahmad Raeisi, Ahmad Ali Enayati, Hossein Mirhendi, Ahmad Ali Hanafi-Bojd, Mohammad Reza Abai, Yaser Salim-Abadi, Fatemeh Rafi
BACKGROUND: Anopheles mosquitoes are an important group of arthropods due to their role in transmission of malaria. The present study was conducted for determination of susceptibility status of Anopheles stephensi to different imagicides collected from malarious area in Chabahar city, Iran. METHODS: In the present study seven insecticides including: DDT 4%, lambdacyhalothrin 0.05%, deltamethrin 0.05%, permethrin 0.75%, cyfluthrin 0.15% and etofenprox 0.5% were tested based on WHO method...
December 2016: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/27723825/multiple-insecticide-resistance-in-the-malaria-vector-anopheles-funestus-from-northern-cameroon-is-mediated-by-metabolic-resistance-alongside-potential-target-site-insensitivity-mutations
#10
Benjamin D Menze, Jacob M Riveron, Sulaiman S Ibrahim, Helen Irving, Christophe Antonio-Nkondjio, Parfait H Awono-Ambene, Charles S Wondji
BACKGROUND: Despite the recent progress in establishing the patterns of insecticide resistance in the major malaria vector Anopheles funestus, Central African populations of this species remain largely uncharacterised. To bridge this important gap and facilitate the implementation of suitable control strategies against this vector, we characterised the resistance patterns of An. funestus population from northern Cameroon. METHODS AND FINDINGS: Collection of indoor-resting female mosquitoes in Gounougou (northern Cameroon) in 2012 and 2015 revealed a predominance of An...
2016: PloS One
https://www.readbyqxmd.com/read/27521908/insecticide-resistance-monitoring-and-correlation-analysis-of-insecticides-in-field-populations-of-the-brown-planthopper-nilaparvata-lugens-st%C3%A3-l-in-china-2012-2014
#11
Xiaolei Zhang, Xun Liao, Kaikai Mao, Kaixiong Zhang, Hu Wan, Jianhong Li
The brown planthopper is a serious rice pest in China. Chemical insecticides have been considered a satisfactory means of controlling the brown planthopper. In the present study, we determined the susceptibility of twenty-one populations of Nilaparvata lugens to eleven insecticides by a rice-stem dipping method from 2012 to 2014 in eight provinces of China. These field-collected populations of N. lugens had developed high levels of resistance to imidacloprid (resistant ratio, RR=233.3-2029-fold) and buprofezin (RR=147...
September 2016: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/27169656/difference-between-consensus-value-of-participants-results-and-isotope-dilution-mass-spectrometric-results-in-proficiency-testing-for-pesticide-residues-in-husked-wheat
#12
Takashi Yarita, Takamitsu Otake, Yoshie Aoyagi, Masahiko Numata, Akiko Takatsu
Proficiency testing was organized by the National Metrology Institute of Japan (NMIJ) as a measure of analytical competency in the quantification of pesticide residues in husked wheat powder. Seventy-one participants submitted analytical concentrations of the target pesticides (diazinon, fenitrothion, malathion, and etofenprox) along with details of the analytical method employed. Two types of assigned values were obtained for each target pesticide, i.e., the participants' analytical results and the results obtained by NMIJ based on isotope-dilution mass spectrometry (IDMS)...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/27155482/unraveling-the-effect-of-structurally-different-classes-of-insecticide-on-germination-and-early-plant-growth-of-soybean-glycine-max-l-merr
#13
Sanjeev Kumar Dhungana, Il-Doo Kim, Hwa-Sook Kwak, Dong-Hyun Shin
Although a considerable number of studies about the effect of different insecticides on plant physiology and metabolism have been carried out, research work about the comparative action of structurally different classes of insecticide on physiological and biochemical properties of soybean seed germination and early growth has not been found. The objective of this study was to investigate the effect of different classes of insecticides on soybean seed germination and early plant growth. Soybean seeds of Bosuk cultivar were soaked for 24h in distilled water or recommended dose (2mLL(-1), 1mLL(-1), 0...
June 2016: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/27138918/proficiency-testing-for-quantification-of-pesticide-residues-in-treated-brown-rice-samples-comparison-of-performance-of-japanese-official-multiresidue-modified-quechers-and-quechers-methods
#14
(no author information available yet)
To support analytical skill development, testing of proficiency in pesticide residue analysis in brown rice was conducted for 86 participating Japanese laboratories. Brown rice test samples containing three target pesticides (etofenprox, fenitrothion, and thiamethoxam) were distributed to participants who were free to choose an appropriate analytical method. Reported results were evaluated using a z-score based on the consensus values calculated from the participant analytical results and a z-score based on the high-reliability reference values determined by the National Metrology Institute of Japan (NMIJ)...
April 30, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/26844772/current-perspectives-on-plague-vector-control-in-madagascar-susceptibility-status-of-xenopsylla-cheopis-to-12-insecticides
#15
Adélaïde Miarinjara, Sébastien Boyer
Plague is a rodent disease transmissible to humans by infected flea bites, and Madagascar is one of the countries with the highest plague incidence in the world. This study reports the susceptibility of the main plague vector Xenopsylla cheopis to 12 different insecticides belonging to 4 insecticide families (carbamates, organophosphates, pyrethroids and organochlorines). Eight populations from different geographical regions of Madagascar previously resistant to deltamethrin were tested with a World Health Organization standard bioassay...
February 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/26589891/the-emergence-of-insecticide-resistance-in-the-major-malaria-vector-anopheles-funestus-diptera-culicidae-from-sentinel-sites-in-mutare-and-mutasa-districts-zimbabwe
#16
Shadreck Sande, Moses Zimba, Peter Chinwada, Hieronymo Takudzwa Masendu, Sungai Mazando, Aramu Makuwaza
BACKGROUND: Insecticide resistance in major malaria vectors poses severe challenges for stakeholders responsible for controlling the disease. During the 2013/14 season, malaria vector sentinel sites in Mutare and Mutasa Districts, Zimbabwe, experienced high presence of gravid malaria vector mosquitoes resting indoors in recently pyrethroid-sprayed structures. Subsequently, an evaluation of insecticide resistance in Anopheles funestus populations, the major malaria vector, was conducted to better inform the Zimbabwe National Malaria Control Programme...
2015: Malaria Journal
https://www.readbyqxmd.com/read/26248028/efficacy-of-two-common-methods-of-application-of-residual-insecticide-for-controlling-the-asian-tiger-mosquito-aedes-albopictus-skuse-in-urban-areas
#17
Lorenzo Marini, Alberto Baseggio, Andrea Drago, Simone Martini, Paolo Manella, Roberto Romi, Luca Mazzon
After its first introduction in the 1980's the Asian tiger mosquito, Aedes albopictus (Skuse), has spread throughout Southern Europe. Ae. albopictus is considered an epidemiologically important vector for the transmission of many viral pathogens such as the yellow fever virus, dengue fever and Chikungunya fever, as well as several filarial nematodes such as Dirofilaria immitis or D. repens. It is therefore crucial to develop measures to reduce the risks of disease transmission by controlling the vector populations...
2015: PloS One
https://www.readbyqxmd.com/read/26168318/dissipation-and-removal-of-the-etofenprox-residue-during-processing-in-spring-onion
#18
Kyu-Won Hwang, Woo-Suk Bang, Hyeong-Wook Jo, Joon-Kwan Moon
The dissipation and removal of the etofenprox residue was studied in spring onion grown under greenhouse conditions. Samples of spring onion were collected at 0, 1, 2, 4, 6, 8, 10, 12, and 14 days after last application, and removal rates of etofenprox by washing and drying processes were measured. Samples were extracted with acetone and partitioned with dichloromethane. The dichloromethane layer was then concentrated, cleaned up with florisil column chromatography, and analyzed with high-performance liquid chromatography-ultraviolet detector (HPLC-UVD)...
August 5, 2015: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/26152407/susceptibility-of-adult-cat-fleas-siphonaptera-pulicidae-to-insecticides-and-status-of-insecticide-resistance-mutations-at-the-rdl-and-knockdown-resistance-loci
#19
Michael K Rust, Richard Vetter, Ian Denholm, Byron Blagburn, Martin S Williamson, Steven Kopp, Glen Coleman, Joe Hostetler, Wendell Davis, Norbert Mencke, Robert Rees, Sabrina Foit, Claudia Böhm, Kathrin Tetzner
The susceptibility of 12 field-collected isolates and 4 laboratory strains of cat fleas, Ctenocephalides felis was determined by topical application of some of the insecticides used as on-animal therapies to control them. In the tested field-collected flea isolates the LD50 values for fipronil and imidacloprid ranged from 0.09 to 0.35 ng/flea and 0.02 to 0.19 ng/flea, respectively, and were consistent with baseline figures published previously. The extent of variation in response to four pyrethroid insecticides differed between compounds with the LD50 values for deltamethrin ranging from 2...
August 2015: Parasitology Research
https://www.readbyqxmd.com/read/26132327/lethal-and-sublethal-effects-of-insecticides-used-on-citrus-on-the-ectoparasitoid-tamarixia-radiata
#20
Vitor Hugo Beloti, Gustavo Rodrigues Alves, Diogo Feliciano Dias Araújo, Mateus Manara Picoli, Rafael de Andrade Moral, Clarice Garcia Borges Demétrio, Pedro Takao Yamamoto
Huanglongbing (HLB) is a disease associated with the bacteria "Candidatus Liberibacter spp." and has been devastating citrus orchards around the world. Its management involves control of the insect vector, the Asian citrus psyllid Diaphorina citri Kuwayama. However, the indiscriminate use of chemicals has caused pest outbreaks and eliminated the natural enemies of the vector, such as the parasitoid Tamarixia radiata (Waterston), the main agent for biological control of D. citri. This study assessed the lethal and sublethal effects of insecticides recommended for integrated production of citrus on the parasitoid T...
2015: PloS One
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