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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
Anita 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), characterize the mechanisms underlying resistance, and to 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...
February 7, 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
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
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
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
(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
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
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
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
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
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
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
James M Mutunga, Troy D Anderson, Derek T Craft, Aaron D Gross, Daniel R Swale, Fan Tong, Dawn M Wong, Paul R Carlier, Jeffrey R Bloomquist
Insecticide resistance in the malaria vector, Anopheles gambiae, is a serious problem, epitomized by the multi-resistant Akron strain, originally isolated in the country of Benin. Here we report resistance in this strain to pyrethroids and DDT (13-fold to 35-fold compared to the susceptible G3 strain), but surprisingly little resistance to etofenprox, a compound sometimes described as a "pseudo-pyrethroid." There was also strong resistance to topically-applied commercial carbamates (45-fold to 81-fold), except for the oximes aldicarb and methomyl...
June 2015: Pesticide Biochemistry and Physiology
Eiki Watanabe, Koji Baba
This paper describes a highly sensitive analytical method using high-performance liquid chromatography and fluorescence detection (HPLC-FLD) capable of quantifying trace amounts of synthetic pyrethroid insecticide etofenprox residue in six vegetable samples: bell pepper, cucumber, eggplant, Japanese mustard spinach, spinach, and tomato. After extraction with acetonitrile, the crude sample extract was cleaned up with a solid-phase extraction cartridge. The matrix interference derived from the tested vegetable samples was evaluated...
March 13, 2015: Journal of Chromatography. A
Emerson C Barros, Leandro Bacci, Marcelo C Picanco, Júlio C Martins, Jander F Rosado, Gerson A Silva
In this study, we carried out three bioassays with nine used insecticides in tomato crops to identify their efficiency against tomato leaf miner Tuta absoluta, the physiological selectivity and the activity reduction of insecticides by three rain regimes to predatory wasps Protonectarina sylveirae and Polybia scutellaris. We assessed the mortality caused by the recommended doses of abamectin, beta-cyfluthrin, cartap, chlorfenapyr, etofenprox, methamidophos, permethrin, phenthoate and spinosad to T. absoluta and wasps at the moment of application...
2015: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
Rabeh Arouri, Gaelle Le Goff, Hiethem Hemden, Vicente Navarro-Llopis, Mariem M'saad, Pedro Castañera, René Feyereisen, Pedro Hernández-Crespo, Félix Ortego
BACKGROUND: The withdrawal of malathion in the European Union in 2009 resulted in a large increase in lambda-cyhalothrin applications for the control of the Mediterranean fruit fly, Ceratitis capitata, in Spanish citrus crops. RESULTS: Spanish field populations of C. capitata have developed resistance to lambda-cyhalothrin (6-14-fold), achieving LC50 values (129-287 ppm) higher than the recommended concentration for field treatments (125 ppm). These results contrast with the high susceptibility to lambda-cyhalothrin found in three Tunisian field populations...
September 2015: Pest Management Science
Takamitsu Otake, Takashi Yarita, Yoshie Aoyagi, Masahiko Numata, Akiko Takatsu
A proficiency test for the analysis of pesticide residues in brown rice was carried out to support upgrading in analytical skills of participant laboratories. Brown rice containing three target pesticides (etofenprox, fenitrothion, and isoprothiolane) was used as the test samples. The test samples were distributed to the 57 participants and analyzed by appropriate analytical methods chosen by each participant. It was shown that there was no significant difference among the reported values obtained by different types of analytical method...
November 2014: Analytical and Bioanalytical Chemistry
Fabrizio Dedola, Maddalena Cabizza, Maurizio Satta
The behavior of 28 pesticides on two tomato cultivars with a different surface/weight (S/W) ratio of the berries (S/W, Birikino vs. Tombola) was studied, in order to provide appropriate indications about their persistence on crops reaching the pre-harvest interval (PHI). Quantitative analysis was performed using a GC MS/MS method. Birikino cv. (BIR) was a "cherry type tomato" with a double S/W ratio compared with Tombola cv. (TOM). The results showed a different pesticide behavior. Azoxystrobin, Boscalid, Bupirimate, Difenoconazole, Etofenprox, Iprodione, Mepanipyrim, Myclobutanil, Tebuconazole, Zoxamide, Metalaxyl M, Pyrimethanil, Tetraconazole, Benalaxyl, Cyprodinil, Fenamidone, Famoxadone and Fludioxonil immediately after treatments showed residues on BIR higher than TOM, and this behavior is consistent with its greater exposed surface...
2014: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
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