Professor Denis Wright

Facknath S, Wright DJ, 2007, Is host selection in leafminer adults influenced by pre-imaginal or early adult experience?, JOURNAL OF APPLIED ENTOMOLOGY, Vol: 131, Pages: 505-512, ISSN: 0931-2048

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• Citations: 21

Raymond B, Sayyed AH, Wright DJ, 2007, Host-plant environment and population interact to determine the fitness costs of resistance to Bacillus thuringiensis, Biology Letters, Vol: 3, Pages: 82-85

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Raymond B, Sayyed AH, Hails RS, Wright DJet al., 2007, Exploiting pathogens and their impact on fitness costs to manage the evolution of resistance to Bacillus thuringiensis, Journal of Applied Ecology, Vol: 44, Pages: 768-780

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Sayyed AH, Wright DJ, 2006, Genetics and evidence for an esterase-associated mechanism of resistance to indoxacarb in a field population of diamondback moth (Lepidoptera: Plutellidae), PEST MANAGEMENT SCIENCE, Vol: 62, Pages: 1045-1051, ISSN: 1526-498X

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• Citations: 119

Singh BK, Walker A, Wright DJ, 2006, Bioremedial potential of fenamiphos and chlorpyrifos degrading isolates: Influence of different environmental conditions, SOIL BIOLOGY & BIOCHEMISTRY, Vol: 38, Pages: 2682-2693, ISSN: 0038-0717

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• Citations: 131

Cerda H, Sayyed AH, Wright DJ, 2006, Diamondback moth resistance to <i>Bacillus thuringiensis</i> transgenic canola:: evaluation of refugia size with non-recessive resistant insects, JOURNAL OF APPLIED ENTOMOLOGY, Vol: 130, Pages: 421-425, ISSN: 0931-2048

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• Citations: 8

Smith SM, Moore D, Oduor GI, Wright DJ, Chandi EA, Agano JOet al., 2006, Effect of wood ash and conidia of <i>Beauveria bassiana</i> (Balsamo) Vuillemin on mortality of <i>Prostephanus truncatus</i> (Horn), JOURNAL OF STORED PRODUCTS RESEARCH, Vol: 42, Pages: 357-366, ISSN: 0022-474X

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• Citations: 7

Wright DJ, Perry RN, 2006, Reproduction, Physiology and Biochemistry, PLANT NEMATOLOGY, Editors: Perry, Moens, Publisher: CABI PUBLISHING-C A B INT, Pages: 187-209

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• Citations: 25

Raymond B, Sayyed AH, Wright DJ, 2006, The compatibility of a nucleopolyhedrosis virus control with resistance management for Bacillus thuringiensis: co-infection and cross-resistance studies with the diamondback moth, Plutella xylostella., Journal of Invertebrate Pathology, Vol: 93, Pages: 114-120

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Sayyed AH, Gatsi R, Ibiza-Palaeios MS, Escriche B, Wright DJ, Crickmore Net al., 2005, Common, but complex, mode of resistance of <i>Plutella xylostella</i> to <i>Bacillus thuringiensis</i> toxins Cry1Ab and Cry1Ac, APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Vol: 71, Pages: 6863-6869, ISSN: 0099-2240

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• Citations: 39

Singh BK, Walker A, Wright DJ, 2005, Cross-enhancement of accelerated biodegradation of organophosphorus compounds in soils: Dependence on structural similarity of compounds, SOIL BIOLOGY & BIOCHEMISTRY, Vol: 37, Pages: 1675-1682, ISSN: 0038-0717

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• Citations: 41

Sayyed AH, Attique MNR, Khaliq A, Wright DJet al., 2005, Inheritance of resistance and cross-resistance to deltamethrin in <i>Plutella xylostella</i> (Lepidoptera: Plutellidae) from Pakistan, PEST MANAGEMENT SCIENCE, Vol: 61, Pages: 636-642, ISSN: 1526-498X

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• Citations: 88

Kalule T, Wright DJ, 2005, Effect of cultivars with varying levels of resistance to aphids on development time, sex ratio, size and longevity of the parasitoid <i>Aphidius colemani</i>, BIOCONTROL, Vol: 50, Pages: 235-246, ISSN: 1386-6141

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• Citations: 20

Belair G, Wright DJ, Curto G, 2005, Vegetable and Tuber Crop Applications, NEMATODES AS BIOCONTROL AGENTS, Editors: Grewal, Ehlers, ShapiroIlan, Publisher: CABI PUBLISHING-C A B INT, Pages: 255-264

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• Citations: 10

Raymond B, Sayyed AH, Wright DJ, 2005, Genes and environment interact to determine the fitness costs of resistance to Bacillus thuringiensis, Proceedings of the Royal Society B-Biological Sciences, Vol: 272, Pages: 1519-1524

Genes which provide resistance to novel challenges such as pesticides, toxins or pathogens often impose fitness costs on individuals with a resistant phenotype. Studies of resistance to Bacillus thuringiensis and its insecticidal Cry toxins indicate that fitness costs may be variable and cryptic. Using two field populations (Karak and Serd4) of the diamondback moth, Plutella xylostella, we tested the hypothesis that the costs associated with resistance to the B. thuringiensis toxin Cry1Ac would be evident when insects were grown under poor environmental conditions, namely limited or poor quality resources. On a poor quality resource, a cultivar of Brassica oleracea var. capitata with varietal resistance to P xylostella, only one resistant population, Karak, showed reduced fitness. Conversely, when we limited a high quality resource, Brassica pekinensis, by imposing larval competition, only resistant Serd4 insects had reduced survival at high larval densities. Furthermore, Cry1Ac resistance in Serd4 insects declined when reared at high larval densities while resistance at low densities fluctuated but did not decline significantly. These results confirm the hypothesis that resistance costs can appear under stressful conditions and demonstrate that the fitness cost of resistance to Bacillus thuringiensis can depend on the particular interaction between genes and the environment.

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Sayyed AH, Wright DJ, 2004, Fipronil resistance in the diamondback moth (Lepidoptera: Plutellidae):: Inheritance and number of genes involved, JOURNAL OF ECONOMIC ENTOMOLOGY, Vol: 97, Pages: 2043-2050, ISSN: 0022-0493

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• Citations: 65

Sayyed AH, Omar D, Wright DJ, 2004, Genetics of spinosad resistance in a multi-resistant field-selected population of <i>Plutella xylostella</i>, PEST MANAGEMENT SCIENCE, Vol: 60, Pages: 827-832, ISSN: 1526-498X

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• Citations: 136

Singh BK, Walker A, Morgan JAW, Wright DJet al., 2004, Biodegradation of chlorpyrifos by <i>Enterobacter</i> strain B-14 and its use in bioremediation of contaminated soils, APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Vol: 70, Pages: 4855-4863, ISSN: 0099-2240

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• Citations: 297

Karimzadeh J, Bonsall MB, Wright DJ, 2004, Bottom-up and top-down effects in a tritrophic system:: the population dynamics of <i>Plutella xylostella</i> (L.)-<i>Cotesia plutellae</i> (Kurdjumov) on different host plants, ECOLOGICAL ENTOMOLOGY, Vol: 29, Pages: 285-293, ISSN: 0307-6946

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• Citations: 31

Cerda H, Wright DJ, 2004, Modeling the spatial and temporal location of refugia to manage resistance in <i>Bt</i> transgenic crops, AGRICULTURE ECOSYSTEMS & ENVIRONMENT, Vol: 102, Pages: 163-174, ISSN: 0167-8809

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• Citations: 42

Kalule T, Wright DJ, 2004, The influence of cultivar and cultivar-aphid odours on the olfactory response of the parasitoid <i>Aphidius colemani</i>, JOURNAL OF APPLIED ENTOMOLOGY, Vol: 128, Pages: 120-125, ISSN: 1439-0418

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• Citations: 27

Sayyed AH, Raymond B, Ibiza-Palacios MS, Escriche B, Wright DJet al., 2004, Genetic and biochemical characterization of field-evolved resistance to Bacillus thuringiensis toxin Cry1Ac in the diamondback moth, Plutella xylostella, Applied and Environmental Microbiology, Vol: 70, Pages: 7010-7017

The long-term usefulness of Bacillus thuringiensis Cry toxins, either in sprays or in transgenic crops, may be compromised by the evolution of resistance in target insects. Managing the evolution of resistance to B. thuringiensis toxins requires extensive knowledge about the mechanisms, genetics, and ecology of resistance genes. To date, laboratory-selected populations have provided information on the diverse genetics and mechanisms of resistance to B. thuringiensis, highly resistant field populations being rare. However, the selection pressures on field and laboratory populations are very different and may produce resistance genes with distinct characteristics. In order to better understand the genetics, biochemical mechanisms, and ecology of field-evolved resistance, a diamondback moth (Plutella xylostella) field population (Karak) which had been exposed to intensive spraying with B. thuringiensis subsp. kurstaki was collected from Malaysia. We detected a very high level of resistance to Cry1Ac; high levels of resistance to B. thuringiensis subsp. kurstaki Cry1Aa, Cry1Ab, and Cry1Fa; and a moderate level of resistance to Cry1Ca. The toxicity of Cry1Ja to the Karak population was not significantly different from that to a standard laboratory population (LAB-UK). Notable features of the Karak population were that field-selected resistance to B. thuringiensis subsp. kurstaki did not decline at all in unselected populations over 11 generations in laboratory microcosm experiments and that resistance to Cry1Ac declined only threefold over the same period. This finding may be due to a lack of fitness costs expressed by resistance strains, since such costs can be environmentally dependent and may not occur under ordinary laboratory culture conditions. Alternatively, resistance in the Karak population may have been near fixation, leading to a very slow increase in heterozygosity. Reciprocal genetic crosses between Karak and LAB-UK populations indicated that resistance was

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Singh BK, Walker A, Morgan JAW, Wright DJet al., 2003, Role of soil pH in the development of enhanced biodegradation of fenamiphos, APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Vol: 69, Pages: 7035-7043, ISSN: 0099-2240

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• Citations: 78

Piggott SJ, Clayton R, Matthews GA, Wright DJet al., 2003, Development of a new application apparatus for entomopathogenic nematodes, PEST MANAGEMENT SCIENCE, Vol: 59, Pages: 1344-1348, ISSN: 1526-498X

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• Citations: 9

Sayyed AH, Schuler TH, Wright DJ, 2003, Inheritance of resistance to <i>Bt</i> canola in a f ield-derived population of <i>Plutella xylostella</i>, PEST MANAGEMENT SCIENCE, Vol: 59, Pages: 1197-1202, ISSN: 1526-498X

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• Citations: 16

Lainé LV, Wright DJ, 2003, The life cycle of <i>Reticulitermes</i> spp. (Isoptera: Rhinotermitidae):: What do we know?: (vol 93, pg 267, 2003), BULLETIN OF ENTOMOLOGICAL RESEARCH, Vol: 93, Pages: 480-480, ISSN: 0007-4853

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Singh BK, Walker A, Morgan JAW, Wright DJet al., 2003, Effects of soil pH on the biodegradation of chlorpyrifos and isolation of a chlorpyrifos-degrading bacterium, APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Vol: 69, Pages: 5198-5206, ISSN: 0099-2240

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• Citations: 245

Lainé LV, Lainé LV, Wright DJ, 2003, The life cycle of Reticulitermes spp (Isoptera: Rhinotermitidae): what do we know?, Bull Entomol Res, Vol: 93, Pages: 267-378, ISSN: 0007-4853

The subterranean termites in the genus Reticulitermes have a complex and plastic life cycle, which has been the subject of a number of publications over the past century. Given the inherent difficulties in studying such cryptic, eusocial organisms it is not perhaps surprising that the literature on their biology has failed to reach a consensus. An overview of the literature is given, which is followed by a discussion of the various theories on the life cycle of Reticulitermes spp. A substantial proportion of the review focuses on the French literature, which constitutes the majority of the primary sources and can be difficult to access. There are many discrepancies in the literature in terms of the number of instars, the definition of workers and the question of whether they should be termed pseudergates or, potentially, an additional terminology used to differentiate between pseudergates and the true workers seen in the higher termites (Isoptera: Termitidae). It remains very difficult to compare publications as there is little conformity; a problem that is aggravated by a general absence of drawings of the relevant instars. Further work on the biology of Reticulitermes is clearly required. There is also a need for researchers to agree on a standard terminology for this genus. A glossary is provided for the various synonyms and definitions.

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Lainé LV, Wright DJ, 2003, The life cycle of <i>Reticulitermes</i> spp. (Isoptera: Rhinotermitidae):: what do we know?, BULLETIN OF ENTOMOLOGICAL RESEARCH, Vol: 93, Pages: 267-278, ISSN: 0007-4853

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• Citations: 86

Hill MG, Nang'ayo FLO, Wright DJ, 2003, Biological control of the larger grain borer <i>Prostephanus truncatus</i> (Coleoptera: Bostrichidae) in Kenya using a predatory beetle <i>Teretrius nigrescens</i> (Coleoptera: Histeridae), BULLETIN OF ENTOMOLOGICAL RESEARCH, Vol: 93, Pages: 299-306, ISSN: 0007-4853

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• Citations: 12