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https://www.readbyqxmd.com/read/28334359/effectiveness-of-microbial-and-chemical-insecticides-for-supplemental-control-of-bollworm-on-bt-and-non-bt-cottons
#1
N S Little, R G Luttrell, K C Allen, O P Perera, K A Parys
Laboratory and field experiments were conducted to determine the effectiveness of microbial and chemical insecticides for supplemental control of bollworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), on non-Bt (DP1441RF) and Bt (DP1321B2RF) cottons. Neonate and 3rd instar larvae survival was evaluated on leaf tissue treated with microbial and chemical insecticides including a commercial formulation of Bacillus thuringiensis (Dipel), a Heliothis (Helicoverpa) nuclear polyhedrosis virus (NPV; Gemstar), λ-cyhalothrin (Karate Z), and chlorantraniliprole (Prevathon)...
March 18, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334350/relative-susceptibility-of-phyllocnistis-citrella-lepidoptera-gracillariidae-to-commonly-used-insecticides-in-maharashtra-india
#2
Anjitha George, C N Rao, Sonali Ghike, Vijay Dhengre
Foliar application of insecticides has been the most commonly followed practice to manage Phyllocnistis citrella Stainton in nurseries and flush leaves in citrus groves. Leaf dip bioassays were conducted against insecticides, viz., acephate 75SP, dimethoate 30EC, abamectin 1.9EC, fenvalerate 20EC, imidacloprid 17.8SL, and thiamethoxam 25WG, and were tested against P. citrella larvae for their susceptibility. Among six insecticides tested on second-instar P. citrella larvae collected from Nagpur mandarin/acid lime cultivars during 2013-2016, abamectin was the most toxic insecticide for the initial year (LC50 values ranged from 20...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334341/large-scale-evaluation-of-association-between-pheromone-trap-captures-and-cotton-boll-infestation-for-pink-bollworm-lepidoptera-gelechiidae
#3
Yves Carrière, Larry Antilla, Leighton Liesner, Bruce E Tabashnik
Although transgenic cotton producing insecticidal proteins from Bacillus thuringiensis (Bt) is a cornerstone for pink bollworm control in some countries, integrated pest management remains important for bolstering sustainability of Bt cotton and is critical for controlling pink bollworm where Bt cotton is not available or where this pest has evolved resistance to Bt cotton. Here, we used data on moth captures in gossyplure-baited pheromone traps and boll infestations for 163 Bt and 152 non-Bt cotton fields from Arizona to evaluate accuracy of chemical control decisions relying on moth trapping data and capacity of Bt cotton to suppress survival of offspring produced by moths...
March 16, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334316/insecticide-resistance-of-several-field-collected-german-cockroach-dictyoptera-blattellidae-strains
#4
Xiaoyan Wu, Arthur G Appel
German cockroaches, Blattella germanica (L.), remain one of the most difficult indoor insect species to control because of its ability to develop resistance to insecticides. The toxicity and resistance levels of five technical-grade insecticides (permethrin, chlorpyrifos, propoxur, imidacloprid, and fipronil) were determined for adult males of seven strains of the German cockroach, a laboratory-reared susceptible strain (S) and six field-collected strains (B, D, E, G, H, and I). Using topical application methods, fipronil was the most toxic insecticide to all seven strains...
March 8, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334290/field-evolved-resistance-of-bemisia-tabaci-hemiptera-aleyrodidae-to-carbodiimide-and-neonicotinoids-in-pakistan
#5
Mushtaq Ahmad, Rashid A Khan
The evolution of resistance to carbodiimide (a toxic metabolite of diafenthiuron) and four neonicotinoids imidacloprid, acetamiprid, thiamethoxam, and thiacloprid in the Pakistani populations of sweetpotato whitefly (Bemisia tabaci Gennadius) was monitored from 1996 to 2015 using a leaf-dip bioassay. Diafenthiuron, imidacloprid, and acetamiprid were introduced into Pakistani agriculture in mid-1990s and heavily used since then, because B. tabaci resistance and consequently control failures to conventional insecticides such as organophosphates, carbamates, and pyrethroids were widespread during the 1990s...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334270/development-of-diagnostic-insecticide-concentrations-and-assessment-of-insecticide-susceptibility-in-german-cockroach-dictyoptera-blattellidae-field-strains-collected-from-public-housing
#6
Mahsa Fardisi, Ameya D Gondhalekar, Michael E Scharf
Insecticide resistance in German cockroaches (Blattella germanica (L.)) has been a barrier to effective control since its first documentation in the 1950s. A necessary first step toward managing resistance is to understand insecticide susceptibility profiles in field-collected strains so that active ingredients (AIs) with lowest resistance levels can be identified. As a first step in this study, diagnostic concentrations (DCs) were determined for 14 insecticide AIs based on lethal concentrations that killed 99% or 90% of the individuals from a susceptible lab strain (JWax-S)...
March 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334260/implicating-abc-transporters-in-insecticide-resistance-research-strategies-and-a-decision-framework
#7
Ryan C Gott, Grace R Kunkel, Emily S Zobel, Brian R Lovett, David J Hawthorne
Pest insects damage crops, transmit diseases, and are household nuisances. Historically, they have been controlled with insecticides, but overuse often leads to resistance to one or more of these chemicals. Insects gain resistance to insecticides through behavioral, metabolic, genetic, and physical mechanisms. One frequently overlooked strategy is through the use of ATP-binding cassette (ABC) transporters. ABC transporters, present in all domains of life, perform natural excretory functions, thus the exploitation of these transporters to excrete insecticides and contribute to resistance is highly plausible...
February 28, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334254/selection-realized-heritability-and-fitness-cost-associated-with-dimethoate-resistance-in-a-field-population-of-culex-quinquefasciatus-diptera-culicidae
#8
Mehboob Alam, Muhammad Waqas Sumra, Daniyal Ahmad, Rizwan Mustafa Shah, Muhammad Binyameen, Sarfraz Ali Shad
Mosquitoes are known to be vectors of numerous diseases leading to human morbidity and mortality at large scale in the world. Insecticide resistance has become a serious concern in controlling the insect vectors of public health importance. Dimethoate is an organophosphate insecticide used to control different insect pests including mosquitoes. Biological parameters of susceptible, unselected, and dimethoate-selected strains of Culex quinquefasciatus Say were studied in the laboratory to recognize resistance development potential and associated fitness cost...
March 14, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334250/the-use-of-f2-screening-for-detection-of-resistance-to-emamectin-benzoate-chlorantraniliprole-and-indoxacarb-in-australian-populations-of-helicoverpa-armigera-lepidoptera-noctuidae
#9
L J Bird, L J Drynan, P W Walker
The ability to effectively detect changes in susceptibility to insecticides is an integral component of resistance management strategies and is highly dependent upon precision of methods deployed. Between 2013 and 2016, F2 screens were performed for detection of resistance alleles in Helicoverpa armigera (Hübner) to emamectin benzoate, chlorantraniliprole, and indoxacarb in major cropping regions of eastern Australia. Resistance to emamectin benzoate was not detected. There were low but detectable levels of survival at discriminating concentrations of chlorantraniliprole and indoxacarb...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334168/resistance-monitoring-for-eight-insecticides-on-the-sweetpotato-whitefly-hemiptera-aleyrodidae-in-china
#10
Shaoli Wang, Youjun Zhang, Xin Yang, Wen Xie, Qingjun Wu
The sweetpotato whitefly, Bemisia tabaci (Gennadius), is an important pest of many crops worldwide. Because control of B. tabaci still depends on the application of insecticides in China, monitoring the insecticide resistance of B. tabaci populations is essential for achieving control and for managing resistance. In this study, field populations of B. tabaci on vegetables were collected in three regions of China in 2011, 2012, and 2013. The resistance of these populations (all of which were determined to belong to biotype Q) to eight insecticides (abamectin, spinetoram, imidacloprid, thiamethoxam, acetamiprid, nitenpyram, chlorpyrifos, and bifenthrin) was assessed by the leaf-dip method...
March 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334150/monitoring-trends-in-insecticide-resistance-of-field-populations-of-sogatella-furcifera-hemiptera-delphacidae-in-guizhou-province-china-2012-2015
#11
Jian-Xue Jin, Dao-Chao Jin, Wen-Hong Li, Ying Cheng, Feng-Liang Li, Zhao-Chun Ye
Sogatella furcifera (Horváth) is a migratory insect that is one of the most important pest species on rice in many Asian countries. Control of S. furcifera (Hemiptera: Delphacidae) primarily depends on the use of chemical insecticides, and with this extensive reliance on pesticides, determining the degree of resistance of S. furcifera populations to the chemicals used for its control is essential. In this study, the resistance level to six conventional insecticides in five populations of S. furcifera from Guizhou Province was monitored yearly using the rice-stem dipping method in 2012-2015 to precisely understand current resistance levels and to estimate trends in the development of insecticide resistance in S...
February 22, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334065/an-overview-of-mechanisms-of-cry-toxin-resistance-in-lepidopteran-insects
#12
B Peterson, C C Bezuidenhout, J Van den Berg
Arthropods have the capacity to evolve resistance to insecticides and insecticidal traits in genetically modified crops. Resistance development among Lepidoptera is a common phenomenon, and a repertoire of resistance mechanisms to various Cry toxins have been identified from laboratory, greenhouse, and field studies in this insect order. Elucidation of such resistance mechanisms is crucial for developing IRM (insect resistance management) strategies to ensure sustainable use of genetically modified crops. This mini review provides a comprehensive overview of mechanisms of resistance that have been reported for lepidopteran pests...
February 16, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28330701/modeling-malaria-control-intervention-effect-in-kwazulu-natal-south-africa-using-intervention-time-series-analysis
#13
Osadolor Ebhuoma, Michael Gebreslasie, Lethumusa Magubane
The change of the malaria control intervention policy in South Africa (SA), re-introduction of dichlorodiphenyltrichloroethane (DDT), may be responsible for the low and sustained malaria transmission in KwaZulu-Natal (KZN). We evaluated the effect of the re-introduction of DDT on malaria in KZN and suggested practical ways the province can strengthen her already existing malaria control and elimination efforts, to achieve zero malaria transmission. We obtained confirmed monthly malaria cases in KZN from the malaria control program of KZN from 1998 to 2014...
March 18, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28330500/larvicidal-activity-of-phytosteroid-compounds-from-leaf-extract-of-solanum-nigrum-against-culex-vishnui-group-and-anopheles-subpictus
#14
Anjali Rawani, Anushree Singha Ray, Anupam Ghosh, Mary Sakar, Goutam Chandra
BACKGROUND: Vector control is facing a menace due to the appearance of resistance to synthetic insecticides. Insecticides of plant origin may provide appropriate substitute biocontrol techniques in the future. The present study was carried out to investigate the bio control potentiality of active ingredient isolated from chloroform: methanol (1:1 v/v) extract of mature leaves of Solanum nigrum L. (Solanaceae) against early 3rd instar larvae of Culex vishnui group (comprising of Cx. vishnui Theobald, Cx...
March 23, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28330102/biodegradation-of-flubendiamide-by-a-newly-isolated-chryseobacterium-sp-strain-ssj1
#15
Shrinivas S Jadhav, M David
Flubendiamide, as a new class (Phthalic acid diamide) of pesticide with a wide spectrum of activity against lepidopteran pests extensively used alone or in combination with other insecticides in agriculture system to get protection from insect pests. Due to high specificity and limited approach towards non-target organism, the extensive use of this pesticide as an alternate for organophosphate and organochlorine pesticides, causing an eventual increase in environmental pollution. Five flubendiamide-resistant bacterial strains were isolated during the present study from agriculture soil considering previous history of pesticide application...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330080/transgenic-rice-plants-expressing-synthetic-cry2ax1-gene-exhibits-resistance-to-rice-leaffolder-cnaphalocrosis-medinalis
#16
R Manikandan, N Balakrishnan, D Sudhakar, V Udayasuriyan
Bacillus thuringiensis is a major source of insecticidal genes imparting insect resistance in transgenic plants. Level of expression of transgenes in transgenic plants is important to achieve desirable level of resistance against target insects. In order to achieve desirable level of expression, rice chloroplast transit peptide sequence was fused with synthetic cry2AX1 gene to target its protein in chloroplasts. Sixteen PCR positive lines of rice were generated by Agrobacterium mediated transformation using immature embryos...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329368/intermittent-preventive-treatment-with-dihydroartemisinin-piperaquine-for-the-prevention-of-malaria-among-hiv-infected-pregnant-women
#17
Paul Natureeba, Abel Kakuru, Mary Muhindo, Eric Littmann, Teddy Ochieng, John Ategeka, Catherine A Koss, Albert Plenty, Edwin D Charlebois, Tamara D Clark, Bridget Nzarubara, Miriam Nakalembe, Deborah Cohan, Gabrielle Rizzuto, Atis Muehlenbachs, Theodore Ruel, Prasanna Jagannathan, Diane V Havlir, Moses R Kamya, Grant Dorsey
Background.: Daily trimethoprim-sulfamethoxazole (TMP-SMX) and insecticide treated nets (ITNs) remain the main interventions for prevention of malaria in HIV-infected pregnant women in Africa. However, antifolate and pyrethroid resistance threaten the effectiveness of these intervention and new ones are needed. Methods.: We conducted a double-blind randomized placebo-controlled trial comparing daily TMP-SMX plus monthly dihydroartemisinin-piperaquine (DP) to daily TMP-SMX alone in HIV-infected pregnant women in an area of Uganda where indoor residual spraying of insecticide (IRS) had recently been implemented...
February 22, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28327996/genome-sequencing-of-the-sweetpotato-whitefly-bemsia-tabaci-med-q
#18
Wen Xie, Chunhai Chen, Zezhong Yang, Litao Guo, Xin Yang, Dan Wang, Ming Chen, Jinqun Huang, Yanan Wen, Yang Zeng, Yating Liu, Jixing Xia, Lixia Tian, Hongying Cui, Qingjun Wu, Shaoli Wang, Baoyun Xu, Xianchun Li, Xinqiu Tan, Murad Ghanim, Baoli Qiu, Huipeng Pan, Dong Chu, Helene Delatte, M N Maruthi, Feng Ge, Xueping Zhou, Xiaowei Wang, Fanghao Wan, Yuzhou Du, Chen Luo, Fengming Yan, Evan L Preisser, Xiaoguo Jiao, Brad S Coates, Jinyang Zhao, Qiang Gao, Jinquan Xia, Ye Yin, Yong Liu, Judith K Brown, Xuguo Joe Zhou, Youjun Zhang
Background: The sweetpotato whitefly Bemisia tabaci is a highly destructive agricultural and ornamental crop pest. It damages host plants through both phloem feeding and vectoring plant pathogens. Introductions of B. tabaci are difficult to quarantine and eradicate because of its high reproductive rates, broad host plant range, and insecticide resistance. Findings: A total of 791 Gb of raw DNA sequence from whole genome shotgun sequencing, and 13 BAC pooling libraries were generated by Illumina sequencing using different combinations of mate-pair and pair-end libraries...
March 15, 2017: GigaScience
https://www.readbyqxmd.com/read/28322676/bedbugs-helping-your-patient-through-an-infestation
#19
REVIEW
Omer Ibrahim, Usama Mohammad Syed, Kenneth J Tomecki
Bedbugs--hematophagous parasitic arthropods of the genus Cimex--have been unwelcome bedfellows for humans for thousands of years. With increases in population density, ease of travel, and insecticide resistance, bedbugs have reemerged. As a result, physicians are often at the forefront in the diagnosis and treatment of bedbug infestation. This review summarizes the biology and epidemiology of bedbugs and provides details on the diagnosis and treatment of bedbug infestation.
March 2017: Cleveland Clinic Journal of Medicine
https://www.readbyqxmd.com/read/28321982/susceptibility-of-insecticide-resistant-bed-bugs-cimex-lectularius-to-infection-by-fungal-biopesticide
#20
Alexis M Barbarin, Giovani S Bellicanta, Jason A Osborne, Coby Schal, Nina E Jenkins
BACKGROUND: Bed bugs are a public health concern, and their incidence is increasing worldwide. Bed bug infestations are notoriously difficult to eradicate, further exacerbated by widespread resistance to pyrethroid and neonicotinoid insecticides. This study evaluated the efficacy of the newly developed fungal biopesticide, Aprehend™, containing Beauveria bassiana, against insecticide-resistant bed bugs. RESULTS: Overall mortality for the Harold Harlan (insecticide-susceptible) strain was high (98-100%) following exposure to Aprehend™ or Suspend SC (deltamethrin)...
March 20, 2017: Pest Management Science
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