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Encarna Sancho, Sandra Banegas, María José Villarroel, Dolores Ferrando
The effect of the pesticide etofenprox (0.76, 0.95, 1.18, 1.48, and 1.85 μg L-1) on survival, reproduction, and growth of Daphnia magna organisms was monitored using 21-day exposure tests. In order to test pesticide effects on D. magna, survival, length, mean total neonates per female, mean brood size, time to first reproduction, mean number broods per female, cumulative molting, and the population parameter intrinsic rate of natural increase (r) were used. Reproduction was seriously affected by etofenprox...
December 14, 2017: Environmental Science and Pollution Research International
Stephanie L Richards, Jo Anne G Balanay, Avian V White, Joe Hope, Kurt Vandock, Brian D Byrd, Michael H Reiskind
Mosquitoes exposed to sublethal doses of insecticides may be selected for resistance to insecticide active ingredients (AIs). Mosquitoes are exposed to AIs through agricultural, public/private mosquito control programs, homeowners, and other sources. Hence, mosquito control programs should routinely measure the resistance/susceptibility status of mosquito populations of public health concern. The objectives here were to determine resistance status for six AIs used in adult mosquito control in the United States to assess how resistance/susceptibility differs between AI, mosquito species (states where > 1 species collected), and between years (some populations sampled for 2 yr)...
November 23, 2017: Journal of Medical Entomology
Haina Sun, Shinji Kasai, Jeffrey G Scott
The house fly, Musca domestica, is a serious pest because it transmits a large diversity of human and veterinary diseases. Insecticides, particularly pyrethroids, are commonly used to control house flies. However, the evolution of pyrethroid resistance has reduced the effectiveness of these insecticides. A major mechanism of resistance to pyrethroids is target site insensitivity caused by the mutations in the voltage-sensitive sodium channel (Vssc) gene (e.g. kdr [L1014F] and super-kdr [M918T+L1014F]). Recently, two novel Vssc alleles, super-kdr+D600N and kdr+T929I were detected in a field collected resistant house fly population in Kansas, USA in 2013...
November 2017: Pesticide Biochemistry and Physiology
Leticia B Smith, Shinji Kasai, Jeffrey G Scott
BACKGROUND: Aedes aegypti is a vector of several important human pathogens. Especially during disease outbreaks, control efforts rely primarily on pyrethroid insecticides for adult mosquito control. A. aegypti has developed resistance nearly everywhere it occurs and insecticides are used. An important mechanism of resistance is due to mutations in the voltage-sensitive sodium channel (Vssc) gene. Two mutations in particular, S989P+V1016G, commonly occur together in parts of Asia. RESULTS: We have created a strain (IsoKDR) that contains the Vssc mutations S989P+V1016G as the only mechanism of pyrethroid resistance within the genetic background of Rockefeller (ROCK), a susceptible lab strain...
October 24, 2017: Pest Management Science
Natasha M Agramonte, Jeffrey R Bloomquist, Ulrich R Bernier
Emerging insecticide resistance is a major issue for vector control. It decreases the effectiveness of insecticides, thereby requiring greater quantities for comparable control with a net increase in risk of disease resurgence, product cost, and damage risk to the ecosystem. Pyrethroid resistance has been documented in Puerto Rican populations of Aedes aegypti (L.) mosquitoes. In this study, topical toxicity of five insecticides (permethrin, etofenprox, deltamethrin, DDT, transfluthrin) was determined for susceptible (Orlando-ORL) and resistant (Puerto Rico-PR) strains of Ae...
September 2017: PLoS Neglected Tropical Diseases
Jochen P Zubrod, Rebecca Bundschuh, Dominic Englert, Markus Rohrberg, Matthias V Wieczorek, Nikita Bakanov, Ralf Schulz, Mirco Bundschuh
Invertebrate-mediated leaf litter decomposition is frequently used to assess stress-related implications in stream ecosystem integrity. In situ measures such as the mass loss from leaf bags or the feeding of caged invertebrates deployed for days or weeks may, however, fail to detect transient effects due to recovery or compensatory mechanisms. We assessed the relevance of transient effects using the peak exposure towards an insecticide (i.e., etofenprox) as a model scenario at three levels of complexity. These were 1) the assessment of the decomposition realised by invertebrate communities in stream mesocosms over 21 days via leaf bags, 2) 7-days lasting in situ bioassays quantifying the leaf consumption of Gammarus fossarum, and 3) a laboratory experiment determining the daily feeding rate of the same species over 7 days...
December 2017: Environmental Pollution
In Kyung Kim, Sung-Woo Kim, A M Abd El-Aty, Md Musfiqur Rahman, Md Humayun Kabir, Han Sol Lee, Hyung Suk Chung, Ji Hoon Jeong, Ho-Chul Shin, Jae-Han Shim
The present study was designed to investigate the residual decline pattern and the risk assessment of 10 different class pesticides, namely azoxystrobin, boscalid, diazinon, diethofencarb, difenoconazole, etofenprox, flubendiamide, paclobutrazol, and pyraclostrobin in young vegetative amaranth (Amaranthus mangostanus) sprayed once or twice under greenhouse growing conditions. Field-incurred samples, collected at 3, 7, or 10 days after application of both treatments, were extracted and purified with the quick, easy, cheap, effective, rugged, and safe "QuEChERS" citrate-buffered method and analyzed with liquid chromatography-electrospray ionization tandem mass spectrometry (LC-MS/MS) in positive ion mode...
November 2017: Environmental Science and Pollution Research International
Aline Aparecida Franco, Odimar Zanuzo Zanardi, Cynthia Renata de Oliveira Jacob, Monique Bárbara Rosa de Oliveira, Pedro Takao Yamamoto
Euseius concordis (Chant) is an important predatory mite found in citrus orchards. The toxicity of 19 pesticides used in citrus orchards on biological and population parameters of this mite was assessed. Our results indicated that formetanate hydrochloride, dimethoate and phosmet were highly harmful (100% mortality) to E. concordis. Carbosulfan, diflubenzuron, fenpropathrin, gamma-cyhalothrin, imidacloprid, lambda-cyhalothrin, lambda-cyhalothrin + thiamethoxam, mineral and vegetable oils, spinosad and thiamethoxam reduced the female's survival and/or fecundity, and were moderately harmful to E...
September 2017: Experimental & Applied Acarology
Na Yu, Jiahua Tian, Yixi Zhang, Zhong Li, Zewen Liu
BACKGROUND: Fitness costs associated with insecticide resistance in pest insects have been recorded and mainly studied under optimal lab conditions. However, resistant insects face more stressors than just insecticides in the field and how the resistant population reacts to these stressors is of practical importance for the controlling of pest insects such as the brown planthopper, Nilaparvata lugens. The present study aimed at exploring the impact of population density on the competitiveness of resistant and susceptible individuals...
August 18, 2017: Pest Management Science
Kenia Fernanda Aguiar Santos, Odimar Zanuzo Zanardi, Matheus Rovere de Morais, Cynthia Renata Oliveira Jacob, Monique Bárbara de Oliveira, Pedro Takao Yamamoto
Hippodamia convergens is an important predator found in different agroecosystems. We evaluated the impacts of six insecticides on eggs, larvae and adults of this predator. For eggs, all insecticides reduced larval hatching rates, but did not affect egg duration. Chlorpyrifos and phosmet reduced larval survival; and chlorpyrifos, etofenprox and phosmet prolonged the larva development time. The survival and duration of pupae were not affected by all insecticides tested. Chlorpyrifos reduced fecundity, fertility and longevity when eggs were sprayed...
November 2017: Chemosphere
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
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
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...
August 2017: Ecotoxicology
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)...
July 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
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
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
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
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
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
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
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