A5036861750- Insect-Plant Interactions and Control
- Insect and Pesticide Research
- Insect Resistance and Genetics
- Insect Pest Control Strategies
- Agricultural pest management studies
- Insect symbiosis and bacterial influences
- Entomopathogenic Microorganisms in Pest Control
- Mosquito-borne diseases and control
- Plant Virus Research Studies
- Plant and animal studies
- Malaria Research and Control
- Agricultural Practices and Plant Genetics
- Lepidoptera: Biology and Taxonomy
- Plant Parasitism and Resistance
- Insect and Arachnid Ecology and Behavior
- Forest Insect Ecology and Management
- CRISPR and Genetic Engineering
- Business Strategy and Innovation
- Agriculture, Plant Science, Crop Management
- Entrepreneurship Studies and Influences
- Nematode management and characterization studies
- Musicology and Musical Analysis
- Business Strategies and Innovation
- Helminth infection and control
- Study of Mite Species
Oxitec (United Kingdom)
2014-2022
Rothamsted Research
2001-2015
The discovery of sulfoxaflor [N-[methyloxido[1-[6-(trifluoromethyl)-3-pyridinyl]ethyl]-λ4-sulfanylidene] cyanamide] resulted from an investigation the sulfoximine functional group as a novel bioactive scaffold for insecticidal activity and subsequent extensive structure−activity relationship study. Sulfoxaflor, first product this new class (the sulfoximines) insect control agents, exhibits broad-spectrum efficacy against many sap-feeding pests, including aphids, whiteflies, hoppers, Lygus,...
Abstract Adult Bemisia tabaci (Gennadius) were tested with imidacloprid in a bioassay method using systemically treated cotton leaves. The was simple, robust and repeatable provided baseline data for laboratory number of recently collected field strains. LC 50 susceptible strains calculated to be 1.7 ppm concentration 16 determined as diagnostic resistance. Ten B. from the Almeria region Spain showed significantly less mortality at dose than intensive use is considered reason occurrence...
Abstract The brown planthopper, Nilaparvata lugens , is an economically significant pest of rice throughout Asia and has evolved resistance to many insecticides including the neonicotinoid imidacloprid. field populations N. imidacloprid been attributed enhanced detoxification by cytochrome P450 monooxygenases (P450s), although, date, causative P450(s) (have) not identified. In present study, biochemical assays using model substrate 7‐ethoxycoumarin showed activity in several resistant...
The tomato leaf miner, Tuta absoluta (Lepidoptera) is a significant pest of tomatoes that has undergone rapid expansion in its range during the past six years and now present across Europe, North Africa parts Asia. One main means controlling this through use chemical insecticides. In current study insecticide bioassays were used to determine susceptibility five T. strains established from field collections Europe Brazil pyrethroids. High levels resistance λ cyhalothrin tau fluvalinate...
Insecticides are important tools for managing damaging insect pests. Compounds that effective against pests such as the whiteflies Bemisia tabaci and Trialeurodes vaporariorum, which show resistance to a range of insecticidal modes action (MOA), have particular value components management programmes. The sulfoximine insecticides chemically unique first incorporate functional group. Sulfoxaflor is compound under commercial development control sap-feeding insects. Its cross-resistance...
Abstract BACKGROUND We report on the status of imidacloprid and ethiprole resistance in Nilaparvata lugens Stål collected from across South East Asia over period 2005–2012. RESULTS A survey found that field populations had developed up to 220‐fold 223‐fold ethiprole, many strains showed high levels both insecticides. also cytochrome P450 CYP6ER1 was significantly overexpressed 12 imidacloprid‐resistant tested when compared with a laboratory susceptible strain, fold changes ranging ten‐...
Abstract Eleven strains of Bemisia tabaci (Gennadius), including a laboratory susceptible strain, were bioassayed as adults with three organophosphorus (OP) insecticides, pyrethroids and one OP/pyrethroid combination. The contemporary from diverse geographical areas hosts included examples the A-, B-, non-B-biotypes. All recent collections multi-resistant to these insecticides which have been used extensively for their control. patterns cross-resistance OPs clear but less so pyrethroids....
Abstract BACKGROUND: Although cross‐resistance between compounds in the same insecticide group is a frequently observed phenomenon, groups that differ structural and functional characteristics can be extremely unpredictable. In case of controlling whitefly, Bemisia tabaci Gennadius, neonicotinoids pyridine azomethine antifeedant pymetrozine represent independent lines discovery should suited for alternation to avoid prolonged selection resistance mechanism. Reports an association responses...
Abstract Susceptibilities of UK and mainland European samples Trialeurodes vaporariorum (Westwood) to the neonicotinoid insecticide imidacloprid were investigated over a 7 year period. All 24 strains collected between 1997 2003 showed similar baseline levels susceptibility that known susceptible laboratory strain when exposed diagnostic concentration (128 mg L −1 ) formulated imidacloprid. Two during 2004, one from The Netherlands, demonstrated reduced at this concentration. Using...
The whitefly Trialeurodes vaporariorum is an economically important crop pest in temperate regions that has developed resistance to most classes of insecticides. However, the molecular mechanisms underlying have not been characterised and, date, progress hampered by a lack nucleotide sequence data for this species. Here, we use pyrosequencing on Roche 454-FLX platform produce substantial and annotated EST dataset. This 'unigene set' will form critical reference point quantitation...
Rice brown planthopper, Nilaparvata lugens Stål, is a primary insect pest of cultivated rice, and effective control essential for economical crop production. Resistance to neonicotinoid insecticides, in particular imidacloprid, has been reported as an increasing constraint recent years. In order investigate the extent resistance, 24 samples N. were collected from China, India, Indonesia, Malaysia, Thailand Vietnam during 2005 2006. Their responses two diagnostic doses imidacloprid...
Development and evaluation of new insect pest management tools is critical for overcoming over-reliance upon, growing resistance to, synthetic, biological plant-expressed insecticides. For transgenic crops expressing insecticidal proteins from the bacterium Bacillus thuringiensis ('Bt crops') emergence slowed by maintaining a proportion crop as non-Bt varieties, which produce insects unselected resistance. While this strategy has been largely successful, multiple cases Bt have now reported....
A recent survey of insecticide resistance in two the most problematic pests UK glasshouses revealed some new developments. At least individuals all samples Trialeurodes vaporariorum that were tested resisted insect growth regulator (IGR) buprofezin. The strongly resistant strains unaffected by field application rate this compound, and even from populations had never been exposed to buprofezin contained survived highest concentration applied (10,000 mg litre-1). was shown select for through...
The inheritance of resistance to pyriproxyfen, an insect growth regulator (a juvenoid, with ovicidal and larvicidal activities), was studied in the whitefly Bemisia tabaci (Gennadius). Two parental strains, both belonging Q biotype, were assayed pyriproxyfen; a susceptible strain (ALM-1) originating from Spain pyriproxyfen-resistant one (Pyri-R) Israel. ratio between two strains approximately 7,000-fold. Concentration-mortality lines for F(1) heterozygous females reciprocal crosses (SS...
Abstract The genetic polymorphism and the biotype identity of tobacco whitefly Bemisia tabaci (Gennadius) have been studied in population samples taken from different localities within Greece cultivated plants growing greenhouses or open environments non-cultivated plants. Two approaches were used: sequencing mitochondrial cytochrome oxidase I (mtCOI) gene genotyping using microsatellite markers. Analyses mtCOI sequences revealed a high homogeneity between Greek which clustered together with...
Background The juvenile hormone mimic, pyriproxyfen is a suppressor of insect embryogenesis and development, effective at controlling pests such as the greenhouse whitefly Trialeurodes vaporariorum (Westwood) which are resistant to other chemical classes insecticides. Although there reports insects evolving resistance pyriproxyfen, underlying mechanism(s) poorly understood. Results Bioassays against eggs German (TV8) population T. revealed moderate level (21-fold) pyriproxyfen. This first...
Four strains of the Q biotype and one B whitefly Bemisia tabaci collected from China were characterised for resistance to four neonicotinoid insecticides pymetrozine. showed moderate strong imidacloprid, thiamethoxam acetamiprid, but little or no cross-resistance dinotefuron. Resistance neonicotinoids was consistently associated with pymetrozine, despite latter having a distinct (though unresolved) mode action. The single strain proved largely susceptible all investigated. in over-expression...
Under permit from the National Biosafety Commission for use of genetically modified organisms, releases a engineered self-limiting strain Aedes aegypti (OX513A) were used to suppress urban pest Ae. in West Panama. Experimental goals assess effects on coexisting population albopictus and examine operational parameters with relevance environmental impact.Ae. populations shown be increasing year upon at each three study sites, potentially reflecting broader-scale incursion into area. abundance...
For more than 60 years, efforts to develop mating-based mosquito control technologies have largely failed produce solutions that are both effective and scalable, keeping them out of reach most governments communities in disease-impacted regions globally. High pest suppression levels trials yet fully translate into broad Aedes aegypti solutions. Two primary challenges date-the need for complex sex-sorting prevent female releases, cumbersome processes rearing releasing male adult...