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https://www.readbyqxmd.com/read/28098188/insecticide-resistance-status-in-the-whitefly-bemisia-tabaci-genetic-groups-asia-i-asia-ii-1-and-asia-ii-7-on-the-indian-subcontinent
#1
N C Naveen, Rahul Chaubey, Dinesh Kumar, K B Rebijith, Raman Rajagopal, B Subrahmanyam, S Subramanian
The present study is a summary of the current level of the insecticide resistance to selected organophosphates, pyrethroids, and neonicotinoids in seven Indian field populations of Bemisia tabaci genetic groups Asia-I, Asia-II-1, and Asia-II-7. Susceptibility of these populations was varied with Asia-II-7 being the most susceptible, while Asia-I and Asia-II-1 populations were showing significant resistance to these insecticides. The variability of the LC50 values was 7x for imidacloprid and thiamethoxam, 5x for monocrotophos and 3x for cypermethrin among the Asia-I, while, they were 7x for cypermethrin, 6x for deltamethrin and 5x for imidacloprid within the Asia-II-1 populations...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28092127/induction-of-p450-genes-in-nilaparvata-lugens-and-sogatella-furcifera-by-two-neonicotinoid-insecticides
#2
Yuan-Xue Yang, Na Yu, Jian-Hua Zhang, Yi-Xi Zhang, Ze-Wen Liu
Nilaparvata lugens and Sogatella furcifera are two primary planthoppers on rice throughout Asian countries and areas. Neonicotinoid insecticides, such as imidacloprid (IMI), have been extensively used to control rice planthoppers and IMI resistance consequently occurred with an important mechanism from the over-expression of P450 genes. The induction of P450 genes by IMI may increase the ability to metabolize this insecticide in planthoppers and increase the resistance risk. In this study, the induction of P450 genes was compared in S...
January 16, 2017: Insect Science
https://www.readbyqxmd.com/read/28087090/quantifying-exposure-of-wild-bumblebees-to-mixtures-of-agrochemicals-in-agricultural-and-urban-landscapes
#3
Cristina Botías, Arthur David, Elizabeth M Hill, Dave Goulson
The increased use of pesticides has caused concern over the possible direct association of exposure to combinations of these compounds with bee health problems. There is growing proof that bees are regularly exposed to mixtures of agrochemicals, but most research has been focused on managed bees living in farmland, whereas little is known about exposure of wild bees, both in farmland and urban habitats. To determine exposure of wild bumblebees to pesticides in agricultural and urban environments through the season, specimens of five different species were collected from farms and ornamental urban gardens in three sampling periods...
January 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28073057/neonicotinoids-transference-from-the-field-to-the-hive-by-honey-bees-towards-a-pesticide-residues-biomonitor
#4
Niell Silvina, Jesús Florencia, Pérez Nicolás, Pérez Cecilia, Pareja Lucía, Silvana Abbate, Carrasco-Letelier Leonidas, Díaz Sebastián, Mendoza Yamandú, Cesio Verónica, Heinzen Horacio
The beehive as a quantitative monitor of pesticide residues applied over a soybean crop was studied through a semi field experiment of controlled exposure of honey bees to pesticides in macro tunnels. The distribution within exposed beehives of pesticides commonly used in soybean plantation, was assessed. Residue levels of insecticides in soybean leaves, honey bees, wax, honey and pollen were analyzed. The transference from pesticides present in the environment into the beehive was evidenced. The obtained results allow relating pesticide concentrations present in the environment with traces found in foraging bees...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28063085/can-toxicants-used-against-cotton-mealybug-phenacoccus-solenopsis-be-compatible-with-an-encyrtid-parasitoid-aenasius-bambawalei-under-laboratory-conditions
#5
Hayat Badshah, Farman Ullah, Paul Andre Calatayud, Hidayat Ullah, Bashir Ahmad
The cotton mealybug, Phenacoccus solenopsis Tinsley (Sternorrhyncha: Pseudococcidae) is a serious pest of various cultivated plants in Pakistan. Recent reports show that the parasitoid Aenasius bambawalei Hayat (Hymenoptera: Encyrtidae) is a good biocontrol agent of the pest. Compatibleness is important in any IPM programme, and the insecticide used must have little or no effects on the biological control agent. This study investigated the compatibility of neem treatments and a commercial insecticide, imidacloprid on A...
January 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28058798/inductions-of-reproduction-and-population-growth-in-the-generalist-predator-cyrtorhinus-lividipennis-hemiptera-miridae-exposed-to-sublethal-concentrations-of-insecticides
#6
Weiwei Lu, Qiujing Xu, Jun Zhu, Chen Liu, Linquan Ge, Guoqing Yang, Fang Liu
BACKGROUND: The miridbug, Cyrtorhinus lividipennis, is a significant predacious enemy of rice planthoppers. The effects of sublethal concentrations of triazophos, deltamethrin and imidacloprid on fecundity, egg hatchability, expression levels of genes associated with reproduction, and population growth in C. lividipennis were investigated. RESULTS: The fecundities for three pair combinations (♀c  × ♂t , ♀t  × ♂c and ♀t  × ♂t ) treated with sublethal concentrations of the insecticides triazophos, deltamethrin and imidacloprid (LC10 and LC20 ) showed a significant increase compared to the untreated pairs (♀c  × ♂c )...
January 6, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28043328/rna-interference-of-three-up-regulated-transcripts-associated-with-insecticide-resistance-in-an-imidacloprid-resistant-population-of-leptinotarsa-decemlineata
#7
Justin Clements, Sean Schoville, Nathan Peterson, Anders S Huseth, Que Lan, Russell L Groves
The Colorado potato beetle, Leptinotarsa decemlineata (Say), is a major agricultural pest of potatoes in the Central Sands production region of Wisconsin. Previous studies have shown that populations of L. decemlineata have become resistant to many classes of insecticides, including the neonicotinoid insecticide, imidacloprid. Furthermore, L. decemlineata has multiple mechanisms of resistance to deal with a pesticide insult, including enhanced metabolic detoxification by cytochrome p450s and glutathione S-transferases...
January 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28040617/comparative-ecotoxicity-of-imidacloprid-and-dinotefuran-to-aquatic-insects-in-rice-mesocosms
#8
Koji Kobashi, Takaaki Harada, Yoshihiro Adachi, Miho Mori, Makoto Ihara, Daisuke Hayasaka
There are growing concerns about the impacts of neonicotinoid insecticides on ecosystems worldwide, and yet ecotoxicity of many of these chemicals at community or ecosystem levels have not been evaluated under realistic conditions. In this study, effects of two neonicotinoid insecticides, imidacloprid and dinotefuran, on aquatic insect assemblages were evaluated in experimental rice mesocosms. During the 5-month period of the rice-growing season, residual concentrations of imidacloprid were 5-10 times higher than those of dinotefuran in both soil and water...
December 29, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28032066/determination-of-pesticides-residues-in-cucumbers-grown-in-greenhouse-and-the-effect-of-some-procedures-on-their-residues
#9
Mostafa Leili, Amin Pirmoghani, Mohammad Taghi Samadi, Reza Shokoohi, Ghodratollah Roshanaei, Ali Poormohammadi
BACKGROUND: The objective of this study was to determine the residual concentrations of ethion and imidacloprid in cucumbers grown in greenhouse. The effect of some simple processing procedures on both ethion and imidacloprid residues were also studied. METHODS: Ten active greenhouses that produce cucumber were randomly selected. Ethion and imidacloprid as the most widely used pesticides were measured in cucumber samples of studied greenhouses. Moreover, the effect of storing, washing, and peeling as simple processing procedures on both ethion and imidacloprid residues were investigated...
November 2016: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28030617/sublethal-effects-of-imidacloprid-on-honey-bee-colony-growth-and-activity-at-three-sites-in-the-u-s
#10
William G Meikle, John J Adamczyk, Milagra Weiss, Ales Gregorc, Don R Johnson, Scott D Stewart, Jon Zawislak, Mark J Carroll, Gus M Lorenz
Imidacloprid is a neonicotinoid pesticide heavily used by the agricultural industry and shown to have negative impacts on honey bees above certain concentrations. We evaluated the effects of different imidacloprid concentrations in sugar syrup using cage and field studies, and across different environments. Honey bee colonies fed sublethal concentrations of imidicloprid (0, 5, 20 and 100 ppb) over 6 weeks in field trials at a desert site (Arizona), a site near intensive agriculture (Arkansas) and a site with little nearby agriculture but abundant natural forage (Mississippi) were monitored with respect to colony metrics, such as adult bee and brood population sizes, as well as pesticide residues...
2016: PloS One
https://www.readbyqxmd.com/read/28028702/field-evidence-of-bird-poisonings-by-imidacloprid-treated-seeds-a-review-of-incidents-reported-by-the-french-sagir-network-from-1995-to-2014
#11
Florian Millot, Anouk Decors, Olivier Mastain, Thomas Quintaine, Philippe Berny, Danièle Vey, Romain Lasseur, Elisabeth Bro
The large-scale use of neonicotinoid insecticides has raised growing concerns about their potential adverse effects on farmland birds, and more generally on biodiversity. Imidacloprid, the first neonicotinoid commercialized, has been identified as posing a risk for seed-eating birds when it is used as seed treatment of some crops since the consumption of a few dressed seeds could cause mortality. But evidence of direct effects in the field is lacking. Here, we reviewed the 103 wildlife mortality incidents reported by the French SAGIR Network from 1995 to 2014, for which toxicological analyses detected imidacloprid residues...
December 27, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28028167/potato-psyllid-hemiptera-triozidae-response-to-insecticides-under-controlled-greenhouse-conditions
#12
E R Echegaray, A C Vinchesi, S I Rondon, J M Alvarez, N McKinley
Bactericera cockerelli (Šulc) is a common pest of solanaceous crops largely known for vectoring "psyllid yellows" in potatoes. In recent years, however, this pest has attracted considerable attention for vectoring Zebra Chip, a devastating bacterial disease that was first reported in the United States in 2004 and has spread across the southern and northwestern states, causing significant economic losses to potato growers and the industry. Management of the disease is mainly achieved by reducing the psyllid population using insecticides, including pyrethroids and neonicotinoids; however, new insecticides with different modes of action are needed to avoid the acquisition of resistance...
December 27, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28028097/behavior-and-survival-of-the-filth-fly-parasitoids-spalangia-endius-and-urolepis-rufipes-hymenoptera-pteromalidae-in-response-to-three-granular-house-fly-baits-and-components
#13
Edwin R Burgess, B H King
Behaviors and mortality of two filth fly parasitoid wasps, Spalangia endius Walker and Urolepis rufipes Ashmead, were tested in response to granular fly baits containing one of the three active ingredients (AI): Golden Malrin (methomyl), QuickBayt (imidacloprid), or Quikstrike (dinotefuran). Behavioral responses to each of the two components of the baits, the AIs and the fly attractant pheromone (Z)-9-tricosene, were also examined independently. Spalangia endius avoided contact with bait granules, regardless of bait type...
December 2016: Environmental Entomology
https://www.readbyqxmd.com/read/28017929/increased-efficacy-of-entomopathogenic-nematode-insecticide-combinations-against-holotrichia-oblita-coleoptera-scarabaeidae
#14
W Guo, X Yan, G Zhao, R Han
Combinations of entomopathogenic nematodes Steinernema longicaudum X-7 and Heterorhabditis bacteriophora H06 with chlorantraniliprole, diflubenzuron, and imidacloprid insecticides at different rates for the control of the white grub, Holotrichia oblita Faldermann (Coleoptera: Scarabaeidae), were evaluated both in the laboratory and in peanut fields. In the laboratory, the combinations had a synergistic or additive effect on the second-instar larvae of H. oblita and caused faster mortality than one nematode species or insecticide alone...
December 25, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28007552/the-potential-subunits-involved-in-two-subtypes-of-%C3%AE-bgt-resistant-nachrs-in-cockroach-dorsal-unpaired-median-dum-neurons
#15
Huahua Sun, Yang Liu, Jian Li, Xinzhu Cang, Haibo Bao, Zewen Liu
The american cockroach (Periplaneta americana) dorsal unpaired median (DUM) neurons provide an native tool to analyze the functional and pharmacological properties of ion channels and membrane receptors, such as nicotine acetylcholine receptors (nAChRs). Here the imidacloprid-activated nAChR subtypes were examined in DUM neurons by the patch-clamp technique and the potential subunits involved in important subtypes were analyzed by combining with RNA interference (RNAi) technique. Imidacloprid exerted agonist activities on one subtype in α-Bgt-sensitive nAChRs and another subtype in α-Bgt-resistant nAChRs, in which the α-Bgt-resistant subtype showed much higher sensitivity to imidacloprid than the α-Bgt-sensitive subtype, with the difference close to 200-fold...
December 20, 2016: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28001052/modeling-re-mobilization-of-neonicotinoid-residues-from-tree-foliage-in-streams-a-relevant-exposure-pathway-in-risk-assessment
#16
Dominic Englert, Nikita Bakanov, Jochen Peter Zubrod, Ralf Schulz, Mirco Bundschuh
Systemic neonicotinoid insecticides are increasingly used as a crop protection measure to suppress insect pests on trees. However, senescent foliage falling from treated trees represents a rarely studied pathway through which neonicotinoids may enter non-target environments, e.g., surface waters. To estimate risk posed by this pathway, neonicotinoid residues were analyzed in foliage from black alder trees treated with one of three neonicotinoid insecticides (imidacloprid, thiacloprid, or acetamiprid) at five concentrations, each ranging from 0...
December 21, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27989110/photochemistry-of-the-neonicotinoid-imidacloprid-on-surfaces
#17
Kifle Z Aregahegn, Dorit Shemesh, R Benny Gerber, Barbara J Finlayson-Pitts
Imidacloprid (IMD) is the most widely used neonicotinoid insecticide found on environmental surfaces and in water. Analysis of surface-bound IMD photolysis products was performed using attenuated total reflectance FTIR (ATR-FTIR), electrospray ionization (ESI-MS), direct analysis in real time mass spectrometry (DART-MS) and transmission FTIR for gas phase products. Photolysis quantum yields (φ) for loss of IMD were determined to be (1.6 ± 0.6) x 10-3 (1s) at 305 nm and (8.5 ± 2.1) x 10-3 (1s) at 254 nm. The major product is the imidacloprid urea derivative (IMD-UR, 84% yield), with smaller amounts of the desnitro imidacloprid (DN-IMD, 16% yield) product, and gaseous nitrous oxide (N2O)...
December 19, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27986941/egg-hatch-rate-and-nymphal-survival-of-the-bed-bug-hemiptera-cimicidae-after-exposure-to-insecticide-sprays
#18
K R Hinson, E P Benson, P A Zungoli, W C Bridges, B R Ellis
Few studies have addressed the efficacy of insecticides used against eggs and first-instar nymphs of the bed bug, Cimex lectularius L. (Hemiptera: Cimicidae). Insect eggs are often resistant to insecticides; therefore, information on which products are effective is important. We evaluated the efficacy of four commonly used insecticide sprays applied directly to bed bug eggs. We also evaluated the efficacy of these insecticides to first-instar nymphs exposed to residuals resulting from directly spraying eggs...
December 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/27986934/effects-of-insecticides-and-fungicides-commonly-used-in-tomato-production-on-phytoseiulus-persimilis-acari-phtyoseiidae
#19
J L Ditillo, G G Kennedy, J F Walgenbach
The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is an important pest of tomatoes in North Carolina. Resident populations of the predatory mite Phytoseiulus persimilis have recently been detected on field-grown tomatoes in central North Carolina, and potentially can be a useful biological control agent against T. urticae Laboratory bioassays were used to assess lethal and reproductive effects of 10 insecticides and five fungicides commonly used in commercial tomato production (chlorantraniliprole, spinetoram, permethrin, imidacloprid, dimethoate, dinotefuran, thiamethoxam, bifenthrin, fenpropathrin, lambda-cyhalothrin, azoxystrobin, chlorothalonil, boscalid, cyazofamid, and mancozeb) on P...
December 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/27976499/imidacloprid-seed-treatments-affect-individual-ant-behavior-and-community-structure-but-not-egg-predation-pest-abundance-or-soybean-yield
#20
Hannah J Penn, Andrew M Dale
BACKGROUND: Neonicotinoid seed treatments are under scrutiny because of their variable efficacy against crop pests and for their potential negative impacts on non-target organisms. Ants provide important biocontrol services in agroecosystems and can be indicators of ecosystem health. This study tested for effects of exposure to imidacloprid plus fungicide or fungicide treated seeds on individual ant survival, locomotion and foraging capabilities, and on field ant community structure, pest abundance, ant predation, and yield...
December 15, 2016: Pest Management Science
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