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https://www.readbyqxmd.com/read/29340612/rice-field-spiders-in-china-a-review-of-the-literature
#1
Huilin Yang, Yuande Peng, Jianxiang Tian, Juan Wang, Baoyang Wei, Chunliang Xie, Zhi Wang
Many laboratory and field studies have been conducted on rice field spiders in China. There are 375 species, 108 genera, and 22 families of rice field spiders distributed within the major rice growing areas and 17 dominant species. The biological and ecological characteristics of 17 rice field spider species have been reported in detail. The biology and ecology of these species show significant differences among regions, farmland habitats, and agricultural practices. Future research should focus on rice field habitat diversity, enhancing the insecticide resistance of dominant spider populations, implementing large-scale breeding of spiders and augmentative release, breeding more leaf dominant species, conducting biosafety assessment of spiders in transgenic crops...
January 8, 2018: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29337073/neofunctionalization-of-duplicated-p450-genes-drives-the-evolution-of-insecticide-resistance-in-the-brown-planthopper
#2
Christoph T Zimmer, William T Garrood, Kumar Saurabh Singh, Emma Randall, Bettina Lueke, Oliver Gutbrod, Svend Matthiesen, Maxie Kohler, Ralf Nauen, T G Emyr Davies, Chris Bass
Gene duplication is a major source of genetic variation that has been shown to underpin the evolution of a wide range of adaptive traits [1, 2]. For example, duplication or amplification of genes encoding detoxification enzymes has been shown to play an important role in the evolution of insecticide resistance [3-5]. In this context, gene duplication performs an adaptive function as a result of its effects on gene dosage and not as a source of functional novelty [3, 6-8]. Here, we show that duplication and neofunctionalization of a cytochrome P450, CYP6ER1, led to the evolution of insecticide resistance in the brown planthopper...
January 4, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29331089/modification-of-chrysanthemum-odour-and-taste-with-chrysanthemol-synthase-induces-strong-dual-resistance-against-cotton-aphids
#3
Hao Hu, Jinjin Li, Thierry Delatte, Jacques Vervoort, Liping Gao, Francel Verstappen, Wei Xiong, Jianping Gan, Maarten A Jongsma, Caiyun Wang
Aphids are pests of chrysanthemum that employ plant volatiles to select host plants and ingest cell contents to probe host quality before engaging in prolonged feeding and reproduction. Changes in volatile and non-volatile metabolite profiles can disrupt aphid-plant interactions and provide new methods of pest control. Chrysanthemol synthase (CHS) from Tanacetum cinerariifolium, represents the first committed step in the biosynthesis of pyrethrin ester insecticides, but no biological role for the chrysanthemol product alone has yet been documented...
January 13, 2018: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/29329545/use-of-epidemiological-and-entomological-tools-in-the-control-and-elimination-of-malaria-in-ethiopia
#4
REVIEW
Abebe Animut, Bernt Lindtjørn
Malaria is the leading public health problem in Ethiopia where over 75% of the land surface is at risk with varying intensities depending on altitude and season. Although the mortality because of malaria infection has declined much during the last 15-20 years, some researchers worry that this success story may not be sustainable. Past notable achievements in the reduction of malaria disease burden could be reversed in the future. To interrupt, or even to eliminate malaria transmission in Ethiopia, there is a need to implement a wide range of interventions that include insecticide-treated bed nets, indoor residual spraying, improved control of residual malaria transmission, and improved diagnostics, enhanced surveillance, and methods to deal with the emergence of resistance both to drugs and to insecticides...
January 12, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29324044/the-management-of-insect-pests-in-australian-cotton-an-evolving-story
#5
Lewis J Wilson, Mary E A Whitehouse, Grant A Herron
The Australian cotton industry progressively embraced integrated pest management (IPM) to alleviate escalating insecticide resistance issues. A systems IPM approach was used with core principles that were built around pest ecology/biology and insecticide resistance management; together, these were integrated into a flexible, year-round approach that facilitated easy incorporation of new science, strategies, and pests. The approach emphasized both strategic and tactical elements to reduce pest abundance and rationalize decisions about pest control, with insecticides as a last resort...
January 7, 2018: Annual Review of Entomology
https://www.readbyqxmd.com/read/29323243/expression-of-cry2ah1-and-two-domain-ii-mutants-in-transgenic-tobacco-confers-high-resistance-to-susceptible-and-cry1ac-resistant-cotton-bollworm
#6
Shengyan Li, Zeyu Wang, Yiyao Zhou, Changhui Li, Guiping Wang, Hai Wang, Jie Zhang, Gemei Liang, Zhihong Lang
To improve the novel Bacillus thuringiensis insecticidal gene cry2Ah1 toxicity, two mutants cry2Ah1-vp (V354VP) and cry2Ah1-sp (V354SP) were performed. SWISS-MODEL analysis showed two mutants had a longer loop located between β-4 and β-5 of domain II, resulting in higher binding affinity with brush border membrane vesicles (BBMV) of Helicoverpa armigera comparing with Cry2Ah1. The cry2Ah1, cry2Ah1-vp, and cry2Ah1-sp were optimized codon usage according to plant codon bias, and named mcry2Ah1, mcry2Ah1-vp, and mcry2Ah1-sp...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29323160/glutathione-s-transferase-gst-of-american-cockroach-periplaneta-americana-classes-isoforms-and-allergenicity
#7
Nitat Sookrung, Onrapak Reamtong, Rojana Poolphol, Nitaya Indrawattana, Watee Seesuay, Nawannaporn Saelim, Pongsakorn Tantilipikorn, Chaweewan Bunnag, Wanpen Chaicumpa, Anchalee Tungtrongchitr
Insect glutathione S-transferases (GSTs) play important roles in insecticide/drug resistance and stress response. Medically, GSTs of house dust mites (Dermatophagoides pteronyssinus and Blomia tropicalis) and German cockroach (Blattella germanica) are human allergens. In this study, classes, isoforms and B-cell and allergenic epitopes of GST of American cockroach, Periplaneta americana, the predominant species in the tropics and subtropics were investigated for the first time. Enzymatically active native and recombinant P...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321568/characterization-of-the-cry1ah-resistance-in-asian-corn-borer-and-its-cross-resistance-to-other-bacillus-thuringiensis-toxins
#8
Muhammad Zeeshan Shabbir, Yudong Quan, Zhenying Wang, Alejandra Bravo, Mario Soberón, Kanglai He
Transgenic crops producing insecticidal proteins are effective to manage lepidopteran pests. Development of insect-resistance is the major threat to Bacillus thuringiensis (Bt) crops such as Cry1Ah-Maize. Laboratory selection with Bt-Cry1Ah toxin incorporated in artificial diet, during 48 generations of Asian corn borer (ACB) Ostrinia furnacalis produced 200-fold resistance. This resistant colony ACB-AhR readily consumed and survived on Cry1Ah-expressing Bt-maize. Cross-resistance analysis showed high cross-resistance to Cry1F (464-fold), moderate cross-resistance to Cry1Ab (28...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321488/bt-cotton-producing-cry1ac-and-cry2ab-does-not-harm-two-parasitoids-cotesia-marginiventris-and-copidosoma-floridanum
#9
Jun-Ce Tian, Xiang-Ping Wang, Yang Chen, Jörg Romeis, Steven E Naranjo, Richard L Hellmich, Ping Wang, Anthony M Shelton
Cabbage looper, Trichoplusia ni (Hübner) is an important lepidopteran pest on many vegetable and greenhouse crops, and some field crops. Although there are no commercial transgenic Bt vegetable or greenhouse crops, T. ni is a target of Bollgard II cotton, which produces Cry1Ac and Cry2Ab. We expand on previous work that examined the effect of Bt crops on parasitoids using Bt-resistant lepidopteran populations as hosts. Cry1Ac/Cry2Ab-resistant T. ni larvae were used to eliminate host quality effects and to evaluate the direct effects of Bt cotton on the parasitoids Copidosoma floridanum (Ashmead) and Cotesia marginiventris (Cresson)...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321052/asgdb-a-specialised-genomic-resource-for-interpreting-anopheles-sinensis-insecticide%C3%A2-resistance
#10
Dan Zhou, Yang Xu, Cheng Zhang, Meng-Xue Hu, Yun Huang, Yan Sun, Lei Ma, Bo Shen, Chang-Liang Zhu
BACKGROUND: Anopheles sinensis is an important malaria vector in Southeast Asia. The widespread emergence of insecticide resistance in this mosquito species poses a serious threat to the efficacy of malaria control measures, particularly in China. Recently, the whole-genome sequencing and de novo assembly of An. sinensis (China strain) has been finished. A series of insecticide-resistant studies in An. sinensis have also been reported. There is a growing need to integrate these valuable data to provide a comprehensive database for further studies on insecticide-resistant management of An...
January 10, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29318991/in-vitro-investigation-of-the-pediculicidal-activities-of-the-volatile-oil-components-of-some-medical-plants-raised-in-turkey
#11
M Emin Limoncu, Cüneyt Balcıoğlu, Tuğba Oyur, Gizem Zeybek, Ulvi Zeybek
OBJECTIVE: The human head louse Pediculus capitis has recently acquired resistance to commercially available insecticides, which has expanded the search concerning the pediculicidal activities of some herbal products. The present study aimed to assess the in vitro pediculicidal activities of volatile oils extracted from 10 medical plants raised in Turkey: Rosa damascena (red provins rose), Pelargonium graveolens (geranium), Lavandula angustifolia (lavender), Salvia triloba (salvia), Rosmarinus officinalis (rosemary; two different chemotypes), Citrus bergamia (citrus tree), Cymbopogon nardus (citronella), Citrus limonum (lemon), and Cymbopogon flexuosus (lemongrass)...
December 2017: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/29318739/coexistence-of-bt-transgenic-and-conventional-rice-affects-insect-abundance-and-plant-fitness-in-fields
#12
Yuyong Liang, Fang Liu, Junsheng Li, Zhengxin Cheng, Hongfan Chen, Xuming Wang, Nengwen Xiao, Yongbo Liu
BACKGROUND: As genetically modified (GM) crops have been cultivated worldwide, concerns emerge over ecological consequences because of the coexistence of transgenic and non-transgenic crops in fields. We first conducted field experiments using insect-resistant Bt-transgenic rice expressing Bacillus thuringiensis and its counterpart conventional rice (Oryza sativa L.) with or without insecticide spraying in 2013 and 2014. In 2015 and 2016, Bt-transgenic and conventional rice were employed in the pure and mixed cages, with an infestation of target insect (Chilo suppressalis) and insecticide spraying as the control treatment to prevent target insects...
January 9, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29316917/an-observational-analysis-of-the-impact-of-indoor-residual-spraying-with-non-pyrethroid-insecticides-on-the-incidence-of-malaria-in-s%C3%A3-gou-region-mali-2012-2015
#13
Joseph Wagman, Christelle Gogue, Kenzie Tynuv, Jules Mihigo, Elie Bankineza, Mamadou Bah, Diadier Diallo, Andrew Saibu, Jason H Richardson, Diakalkia Kone, Seydou Fomba, Jeff Bernson, Richard Steketee, Laurence Slutsker, Molly Robertson
BACKGROUND: Ségou Region in Central Mali is an area of high malaria burden with seasonal transmission, high access to and use of long-lasting insecticidal nets (LLINs), and resistance to pyrethroids and DDT well documented in Anopheles gambiae s.l. (the principal vector of malaria in Mali). Ségou has recently received indoor residual spraying (IRS) supported by Mali's collaboration with the US President's Malaria Initiative/Africa Indoor Residual Spraying programme. From 2012 to 2015, two different non-pyrethroid insecticides: bendiocarb in 2012 and 2013 and pirimiphos-methyl in 2014 and 2015, were used for IRS in two districts...
January 10, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29316188/evidence-for-activation-of-nitenpyram-by-a-mitochondrial-cytochrome-p450-in-drosophila-melanogaster
#14
Thomas W R Harrop, Shane Denecke, Ying Ting Yang, Janice Chan, Phillip J Daborn, Trent Perry, Philip Batterham
BACKGROUND: Nitenpyram is a member of the economically important neonicotinoid class of insecticides. The in vivo metabolism of nitenpyram is not well characterised, but cytochrome P450 activity is the major mechanism of resistance to neonicotinoids identified in insect pests, and P450s metabolise other neonicotinoids including imidacloprid. RESULTS: Here, we used the GAL4/UAS system to direct RNAi against the cytochrome P450 redox partners to interrupt P450 functions in specific tissues in Drosophila melanogaster...
January 9, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29310704/mapping-insecticide-resistance-in-anopheles-gambiae-s-l-from-c%C3%A3-te-d-ivoire
#15
Soromane Camara, Alphonsine A Koffi, Ludovic P Ahoua Alou, Kouakou Koffi, Jean-Paul K Kabran, Aboubacar Koné, Mathieu F Koffi, Raphaël N'Guessan, Cédric Pennetier
BACKGROUND: Insecticide resistance in malaria vectors is an increasing threat to vector control tools currently deployed in endemic countries. Resistance management must be an integral part of National Malaria Control Programmes' (NMCPs) next strategic plans to alleviate the risk of control failure. This obviously will require a clear database on insecticide resistance to support the development of such a plan. The present work gathers original data on insecticide resistance between 2009 and 2015 across Côte d'Ivoire in West Africa...
January 8, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29306333/effectiveness-of-a-novel-long-lasting-pyriproxyfen-larvicide-sumilarv%C3%A2-2mr-against-aedes-mosquitoes-in-schools-in-yangon-myanmar
#16
Sai Zaw Min Oo, Sein Thaung, Yan Naung Maung Maung, Khin Myo Aye, Zar Zar Aung, Hlaing Myat Thu, Kyaw Zin Thant, Noboru Minakawa
BACKGROUND: Mosquito-borne diseases are prevalent in Myanmar, with the number of dengue cases showing a significant increase in recent years. Dengue vectors have developed resistance to insecticides and currently used larvicides show only short-term effectiveness. As a result, an alternative larvicide is urgently needed. The present study evaluated the larvicidal effectiveness of long-lasting pyriproxyfen resin discs (SumiLarv®2MR) against dengue virus vectors in schools in Hlaing Thar Yar Township, Yangon...
January 6, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29304805/status-of-insecticide-resistance-in-malaria-vectors-in-kwale-county-coastal-kenya
#17
Caroline W Kiuru, Florence Awino Oyieke, Wolfgang Richard Mukabana, Joseph Mwangangi, Luna Kamau, Damaris Muhia-Matoke
BACKGROUND: The strategy for malaria vector control in the context of reducing malaria morbidity and mortality has been the scale-up of long-lasting insecticidal nets to universal coverage and indoor residual spraying. This has led to significant decline in malaria transmission. However, these vector control strategies rely on insecticides which are threatened by insecticide resistance. In this study the status of pyrethroid resistance in malaria vectors and it's implication in malaria transmission at the Kenyan Coast was investigated...
January 5, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29301564/culex-pipiens-pallens-cuticular-protein-cplcg5-participates-in-pyrethroid-resistance-by-forming-a-rigid-matrix
#18
Yun Huang, Qin Guo, Xiaohong Sun, Cheng Zhang, Na Xu, Yang Xu, Dan Zhou, Yan Sun, Lei Ma, Changliang Zhu, Bo Shen
BACKGROUND: Chemical insecticides have hugely reduced the prevalence of vector-borne diseases around the world, but resistance threatens their continued effectiveness. Despite its importance, cuticle resistance is an under-studied area, and exploring the detailed molecular basis of resistance is critical for implementing suitable resistance management strategies. METHODS: We performed western blotting of cuticular protein CPLCG5 in deltamethrin-susceptible (DS) and laboratory-produced deltamethrin-resistant (DR) strains of Culex pipiens pallens...
January 4, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29298700/evidence-for-multiple-insecticide-resistance-in-urban-aedes-albopictus-populations-in-southern-china
#19
Yiji Li, Jiabao Xu, Daibin Zhong, Hong Zhang, Wenqiang Yang, Guofa Zhou, Xinghua Su, Yang Wu, Kun Wu, Songwu Cai, Guiyun Yan, Xiao-Guang Chen
BACKGROUND: Aedes albopictus (Skuse) is an invasive mosquito that has become an important vector of chikungunya, dengue and Zika viruses. In the absence of specific antiviral therapy or a vaccine, vector management is the sole method available for reducing Aedes-induced disease morbidity. Determining the resistance status of Ae. albopictus to insecticides and exploring the resistance mechanisms is essential for future vector control planning. METHODS: Aedes albopictus larvae and pupae were sampled from six sites (two sites each from urban, suburban and rural) in Guangzhou...
January 3, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29291390/certain-applied-electrical-signals-during-epg-cause-negative-effects-on-stylet-probing-behaviors-by-adult-lygus-lineolaris-hemiptera-miridae
#20
Elaine A Backus, Felix A Cervantes, Larry Godfrey, Waseem Akbar, Thomas L Clark, Maria G Rojas
This study is the first to fully evaluate whether electrical signals applied to large insects during electropenetrography (EPG; also called electrical penetration graph) negatively affect insect behavior. During EPG, electrical signals are applied to plants, and thus to the gold-wire-tethered insects feeding on them. The insect completes an electrical circuit whose changes in voltage reflect the insect's stylet probing/penetration behaviors, recorded as waveform output. For nearly 50 years of EPG science, evidence has supported that there are no or negligible effects on tiny insects from applied electricity during EPG...
December 29, 2017: Journal of Insect Physiology
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