Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| reproductive strategy of winged and wingless morphs of the aphids sitobion avenae and metopolophium dirhodum. | the reproduction of apterous and alate morphs of the aphids sitobion avenae and metopolophium dirhodum is compared on the basis of fecundity in 5- and 10-day periods of adult life. apterae of both species are consistently more fecund than alatae of comparable weight, producing about three more nymphs on average in any 5-day period. the reproductive differences are related to the number and quality of embryos at eclosion and to ovulation rates, both of which in turn appear to be linked to wing-mu ... | 1977 | 848782 |
| geographic and microgeographic genetic differentiation in two aphid species over southern england using the multilocus (gata)4 probe. | samples of the grain aphid sitobion avenae (f.) and the rose-grain aphid metopolophium dirhodum (walker) were collected in late march from wheat fields and adjacent road-side grasses at a number of locations in southern england. unparasitized aphids were dna fingerprinted using the multilocus (gata)4 probe. over all locations, the fingerprints of individual s. avenae caught in wheat had lower overall average distances of band migration (adbm) and shared a higher proportion of bands, than fingerp ... | 1995 | 7663754 |
| seasonal dynamics of cereal aphids on russian wheat aphid (homoptera: aphididae) susceptible and resistant wheats. | field experiments were conducted in 1997 and 1998 to evaluate the impact of resistance to russian wheat aphid, diuraphis noxia (mordvilko), on the cereal aphid complex in wheat. two spring wheats were planted: the variety "centennial" (russian wheat aphid susceptible) and the advanced line ido488 (russian wheat aphid resistant). ido488 incorporates the resistance found in pi 294994 into a centennial background. field plots were artificially infested with adult d. noxia and sampled weekly. the mo ... | 2000 | 10902358 |
| effects of 1,4-benzoxazin-3-one derivatives from maize on survival and fecundity of metopolophium dirhodum (walker) on artificial diet. | effects of 2-beta-d-glucopyranosyloxy-4-hydroxy-7-methoxy-1,4-benzoxazin-3-one (dimboa-glc) and dimboa-glc n-o-methylated (hdmboa-glc), two compounds present in high concentration in maize, were tested on the aphid metopolophium dirhodum reared on artificial diet. hdmboa-glc and dimboa-glc decrease survival of adults with an ld50 of i mm and 5.6 mm, respectively, after 72 hr of feeding. these compounds also decrease the fecundity of the aphids at concentrations of 2 mm and 1 mm, respectively. at ... | 2001 | 14768820 |
| host plant age and population development of a cereal aphid, metopolophium dirhodum (hemiptera: aphididae). | the sudden decline following the peak in population abundance of aphids on crops of small grain cereals is attributed to the joint effect of natural enemies and plant senescence. to distinguish between these causes, a four year experiment was established in which the numbers of metopolophium dirhodum (walker) infesting spring wheat plots sown from april to june at c. 14 day intervals were determined. aphid abundance in replicates sown at successive dates peaked within a period of 5-9 days (106-1 ... | 0 | 14972046 |
| observation on the initial inoculum source and dissemination of entomophthorales-caused epizootics in populations of cereal aphids. | a total number of 1092 migratory alates were trapped from air in wheat grown area of yuanyang county, henan province from early april through may 2002 in order to confirm the source and dissemination of entomophthoralean inocula to cause epizootics of cereal aphids. those included 415 sitobion avenae, 642 rhopalosiphum padi, 22 metopolophium dirhodum, and 13 schizaphis graminum. the trapped alates were daily collected and individually reared for 7 days on wheat plants in laboratory. of those 341 ... | 2004 | 15382675 |
| ostrinia nubilalis parasitism and the field abundance of non-target insects in transgenic bacillus thuringiensis corn (zea mays). | in this study, we evaluated in field trials the effects on non-target species, of transgenic corn producing the cry1ab toxin of bacillus thuringiensis (bt). in 1998, we collected ostrinia nubilalis (hübner) larvae from transgenic bt corn (novartis hybrid 176) and non-bt corn at four geographical sites. we found a significant variation in parasitism by the tachinids lydella thompsoni (herting) and pseudoperichaeta nigrolineata (walker) among sites, and more parasitism in non-bt than in bt fields. ... | 2002 | 15612256 |
| wheat containing snowdrop lectin (gna) does not affect infection of the cereal aphid metopolophium dirhodum by the fungal natural enemy pandora neoaphidis. | studies were carried out to determine if susceptibility of the cereal aphid metopolophium dirhodum to the fungus pandora neoaphidis was affected by wheat expressing snowdrop lectin (gna). aphid infection did not differ significantly between the transgenic gna and non-transformed lines (91 and 82%, respectively). fecundity also did not differ between aphids on the two lines, and was ca. 18 nymphs adult(-1). time to infection was ca. 5 days for m. dirhodum on both lines in two of three assays. our ... | 2005 | 16201413 |
| the role of large-scale spatially explicit and small-scale localized processes on the population dynamics of cereal aphids. | a field-scale study of the spatially explicit interaction between the carabid poecilus cupreus linnaeus, and two common aphid species (sitobion avenae (fabricius) and metopolophium dirhodum (walker)) in winter wheat was conducted. all three species showed considerable spatial pattern at the field scale. activity-density of p. cupreus was an order of magnitude higher in the central part of the field compared to its periphery. where p. cupreus activity-density was highest, s. avenae and m. dirhodu ... | 2005 | 16336705 |
| comparing growth patterns among field populations of cereal aphids reveals factors limiting their maximum abundance. | cereal stands in central europe are commonly infested with three species of aphids that may become serious pests. with increasing abundance, the proportion of a particular species in the total aphid population may remain constant, suggesting a density-independent exponential growth, or the proportion can change, suggesting density-dependent constraints on growth. the constraints that affect particular species, and thus their relative abundance, were studied. the proportionality between maximum a ... | 2006 | 16768815 |
| host specialization in habitat specialists and generalists. | generalists and specialists use different cues to find their habitat and essential resources. while generalists have the advantage of exploiting a wider range of resources, they are predicted to be less efficient in using one particular resource compared to specialists. the level of specialization of parasitoids can be either at the habitat or at the host level; strategies used by either type are expected to differ. we examined interactions between three aphid parasitoid species that are a habit ... | 2008 | 18443827 |
| aglomerular hemipteran antennal lobes--basic neuroanatomy of a small nose. | we have compared the basic organization of the primary olfactory centre, the antennal lobe (al), in 4 hemipteran species representing the 2 major lineages in this order. the homoptera were represented by the psyllid trioza apicalis and its aphid relatives the grain aphid sitobion avenae fabricius and the rose-grain aphid metopolophium dirhodum walker, whereas the heteroptera were represented by the pentatomid stink bug euschistus heros fabricius. the olfactory systems of psyllids and aphids are ... | 2008 | 18653643 |
| plum pox in north america: identification of aphid vectors and a potential role for fruit in virus spread. | abstract thirteen aphid species were tested for their ability to transmit pennsylvania isolates of plum pox virus (ppv) collected in columbia (penn-3), franklin (penn-4), and york (penn-7) counties, pa. four species, aphis fabae, a. spiraecola, brachycaudus persicae, and myzus persicae, consistently transmitted ppv in preliminary transmission tests. two species, metopolophium dirhodum and rhopalosiphum padi, were occasional inefficient vectors. toxoptera citricida, from florida, also was an effe ... | 2004 | 18943108 |
| analyzing and modeling temporal disease progress of barley yellow dwarf virus serotypes in barley fields. | abstract population dynamics of padi avenae (pav), macrosiphum avenae (mav), and rhopalosiphum padi (rpv) virus serotypes of barley yellow dwarf virus (bydv) and of their main aphid vectors were studied in winter barley (hordeum vulgare) fields for three successive years in western france. an epidemiological model of the spread of viruses in the field was developed based on vector populations as forcing variables and the population dynamics of each virus serotype. this model accurately simulated ... | 2000 | 18944507 |
| differential regulation of 3-aminomethylindole/n-methyl-3-aminomethylindole n-methyltransferase and gramine in barley by both biotic and abiotic stress conditions. | the expression of nmt (3-aminomethylindole/n-methyl-3-aminomethylindole n-methyltransferase; ec 2.1.1.), involved in the biosynthesis of the indole alkaloid gramine, was investigated in aphid-infested barley (hordeum vulgare l.). nmt is induced by methyl jasmonate and it was hypothesized that the gene would be more strongly upregulated in aphid-resistant barley. we examined the effects of feeding by three aphid species; russian wheat aphid (diuraphis noxia mordvilko), rose-grain aphid (metopolop ... | 2010 | 21074448 |
| antifeedant activity of fatty acid esters and phytosterols from echium wildpretii. | crude extracts and fractions from echium wildpretii h. pearson ex hook. f. subsp. wildpretii (boraginaceae) have been tested against insect species spodoptera littoralis, leptinotarsa decemlineata, and the aphids myzus persicae, diuraphis noxia, metopolophium dirhodum, rhopalosiphum maidis, and rhopalosiphum padi. the etoh extract and the lipid and steroidal fractions of e. wildpretii exhibited significant antifeedant activities against the aphids and l. decemlineata. two bioactive mixtures comp ... | 2012 | 22422524 |
| composition and biological activity of essential oils against metopolophium dirhodum (hemiptera: aphididae) cereal crop pest. | natural pesticides based on plant essential oils may represent alternative crop protectants. this study analysed the chemical constituents and bioactivities of essential oils from schinus areira l., rosmarinus officinalis l. and tagetes terniflora kunth against winged and wingless adults of metopolophium dirhodum (walk.). | 2012 | 22674887 |
| indirect effect of a transgenic wheat on aphids through enhanced powdery mildew resistance. | in agricultural ecosystems, arthropod herbivores and fungal pathogens are likely to colonise the same plant and may therefore affect each other directly or indirectly. the fungus that causes powdery mildew (blumeria graminis tritici) and cereal aphids are important pests of wheat but interactions between them have seldom been investigated. we studied the effects of powdery mildew of wheat on two cereal aphid species, metopolophium dirhodum and rhopalosiphum padi. we hypothesized that aphid numbe ... | 2012 | 23056284 |
| molecular identification of the secondary endosymbiont hamiltonella defensa in the rose-grain aphid metopolophium dirhodum. | this is the first report of the association between the rose-grain aphid metopolophium dirhodum, a potentially important cereal pest and the facultative symbiont hamiltonella defensa. the infection with this gamma-proteobacterium was determined by pcr in laboratory-reared and field-collected specimens of an argentinian population of the aphid. partial bacterial 16s, igs and 23s rrna genes were sequenced and compared to other available hamiltonella sequences by phylogenetic analysis. the present ... | 2012 | 23267621 |
| proteomic profiling of cereal aphid saliva reveals both ubiquitous and adaptive secreted proteins. | the secreted salivary proteins from two cereal aphid species, sitobion avenae and metopolophium dirhodum, were collected from artificial diets and analysed by tandem mass spectrometry. protein identification was performed by searching ms data against the official protein set from the current pea aphid (acyrthosiphon pisum) genome assembly and revealed 12 and 7 proteins in the saliva of s. avenae and m. dirhodum, respectively. when combined with a comparable dataset from a. pisum, only three indi ... | 2013 | 23460852 |
| plant species composition alters the sign and strength of an emergent multi-predator effect by modifying predator foraging behaviour. | the prediction of pest-control functioning by multi-predator communities is hindered by the non-additive nature of species functioning. such non-additivity, commonly termed an emergent multi-predator effect, is known to be affected by elements of the ecological context, such as the structure and composition of vegetation, in addition to the traits of the predators themselves. here we report mesocosm experiments designed to test the influence of plant density and species composition (wheat monocu ... | 2013 | 23936400 |
| detoxification of cereal plant allelochemicals by aphids: activity and molecular weights of glutathiones-transferase in three species of cereal aphids. | the activity and molecular weights of glutathiones-transferase were studied in three species of cereal aphid:metopolophium dirhodum, sitobion avenae, andrhopalosiphum padi. the highest level of glutathiones-transferase activity was recorded in extracts fromm. dirhodum and the lowest froms. avenae, and extracts of larvae were more active than those from adults. the activity of this enzyme was higher in extracts ofs. avenae andr. padi previously fed on a moderately resistant wheat variety than on ... | 1994 | 24242062 |
| population dynamics of aphids on cereals: digging in the time-series data to reveal population regulation caused by temperature. | aphid populations show periodic fluctuations and many causes are attributed to their dynamic. we investigated the regulation by temperature of the aphid populations composed of metopolophium dirhodum, sitobion avenae, and rhopalosiphum padi on winter wheat using a 24 years long time series data. we computed the sum of daily temperatures above 5 °c, the threshold temperature for aphid development, and the sum of daily temperatures within the [0(threshold for wheat development),5] °c interval. app ... | 0 | 25184219 |
| cereal aphid colony turnover and persistence in winter wheat. | an understanding of spatial and temporal processes in agricultural ecosystems provides a basis for rational decision-making with regards to the management and husbandry of crops, supporting the implementation of integrated farming strategies. in this study we investigated the spatial and temporal distribution of aphid pests (sitobion avenae and metopolophium dirhodum) within winter wheat fields. using an intensive sampling programme we investigated distributions at both the small (single shoot) ... | 2014 | 25268240 |
| activities of glutathione s-transferase and glutathione peroxidases related to diet quality in an aphid predator, the seven-spot ladybird, coccinella septempunctata l. (coleoptera: coccinellidae(. | larvae of coccinella septempunctata were reared on three aphid diets, consisting of pure rhopalosiphum padi, pure metopolophium dirhodum, and an equal mix of these aphid species. in the pupal stage, the activities of three detoxifying enzyme systems - glutathione s-transferase (gst) with 1-chloro-2,4-dinitrobenzene as substrate, glutathione peroxidase with hydrogen peroxide as substrate (gsh-px[h2o2]), and glutathione peroxidase with tert-butyl hydroperoxide as substrate (gsh-px[tbh]) - were ass ... | 2014 | 25419924 |
| could behaviour and not physiological thermal tolerance determine winter survival of aphids in cereal fields? | traits of physiological thermotolerance are commonly measured in the laboratory as predictors of the field success of ectotherms at unfavourable temperatures (e.g. during harsh winters, heatwaves, or under conditions of predicted global warming). due to being more complicated to measure, behavioural thermoregulation is less commonly studied, although both physiology and behaviour interact to explain the survival of ectotherms. the aphids metopolophium dirhodum, rhopalosiphum padi and sitobion av ... | 2014 | 25490555 |
| risk assessment of genetically engineered maize resistant to diabrotica spp.: influence on above-ground arthropods in the czech republic. | transgenic maize mon88017, expressing the cry3bb1 toxin from bacillus thuringiensis (bt maize), confers resistance to corn rootworms (diabrotica spp.) and provides tolerance to the herbicide glyphosate. however, prior to commercialization, substantial assessment of potential effects on non-target organisms within agroecosystems is required. the mon88017 event was therefore evaluated under field conditions in southern bohemia in 2009-2011, to detect possible impacts on the above-ground arthropod ... | 2015 | 26083254 |
| impact of change in winter strategy of one parasitoid species on the diversity and function of a guild of parasitoids. | the rise of temperatures may enable species to increase their activities during winter periods and to occupy new areas. in winter, resource density is low for most species and an increased number of active consumers during this season may produce heightened competitive pressure. in western france, the aphid parasitoid species aphidius avenae haliday has been known to adopt a winter diapausing strategy adjacent to newly sown cereal crops, until recent reports of active winter populations in cerea ... | 2016 | 26558625 |
| diversity, frequency and geographic distribution of facultative bacterial endosymbionts in introduced aphid pests. | facultative bacterial endosymbionts in insects have been under intense study during the last years. endosymbionts can modify the insect's phenotype, conferring adaptive advantages under environmental stress. this seems particularly relevant for a group of worldwide agricultural aphid pests, because endosymbionts modify key fitness related traits, including host plant use, protection against natural enemies and heat tolerance. aimed to understand the role of facultative endosymbionts on the succe ... | 2016 | 26773849 |
| treatment by glyphosate-based herbicide alters life history parameters of the rose-grain aphid metopolophium dirhodum. | glyphosate is the number one herbicide in the world. we investigated the sub-lethal effects of this herbicide on the aphid metopolophium dirhodum (walker), using an age-stage, two-sex life table approach. three concentrations of the herbicide (low - 33.5, medium - 66.9 and high - 133.8 mmol dm(-3) of active ingredient) and distilled water as the control were used. the lc50 of the ipa salt of glyphosate on m. dirhodum was equivalent to 174.9 mmol dm(-3) of the active ingredient (ci95: 153.0, 199. ... | 2016 | 27302015 |
| contribution of noncolonizing aphids to potato virus y prevalence in potato in idaho. | potato virus y (pvy) is a major concern for potato production in the united states given its impact on both crop quality and yield. although green peach aphid, myzus persicae (sulzer), is the most efficient pvy vector, it may be less abundant in potato-growing areas of idaho relative to non-potato-colonizing aphid vectors of pvy that may disperse from nearby cereal fields and other crops. a field study was conducted during 2012-2013 to examine if noncolonizing aphids disperse to nearby potato fi ... | 2016 | 27694432 |
| potential host manipulation by the aphid parasitoid aphidius avenae to enhance cold tolerance. | during parasitoid development, the immature parasitoid is confined to the host species. as a result, any potential to modify the physiology or behaviour of the host could play an important role in parasitoid fitness. the potential for host manipulation by the aphid parasitoid aphidius avenae to increase cold thermotolerance was investigated using the aphid host species metopolophium dirhodum and sitobion avenae. aphids were parasitized at l3/l4 instar stage (5 d old) and allowed to develop into ... | 2016 | 28006018 |
| contribution of noncolonizing aphids to potato virus y prevalence in potato in idaho. | potato virus y (pvy) is a major concern for potato production in the united states given its impact on both crop quality and yield. although green peach aphid, myzus persicae (sulzer), is the most efficient pvy vector, it may be less abundant in potato-growing areas of idaho relative to non-potato-colonizing aphid vectors of pvy that may disperse from nearby cereal fields and other crops. a field study was conducted during 2012-2013 to examine if noncolonizing aphids disperse to nearby potato fi ... | 2016 | 28028092 |
| treating prey with glyphosate does not alter the demographic parameters and predation of the harmonia axyridis (coleoptera: coccinellidae). | glyphosate is an herbicide that is used worldwide with potential environmental risks to nontarget organisms. we applied an age-stage, two-sex life table approach to assess the sublethal effects of short-term oral exposure to a glyphosate-based herbicide on the life table parameters and biocontrol potential of harmonia axyridis (pallas) (coleoptera: coccinellidae). aphids (metopolophium dirhodum (walker) (sternorrhyncha: aphididae)) treated with herbicide (an isopropylamine-salt of glyphosate) at ... | 2017 | 28131988 |
| population growth and structure in a variable environment : i. aphids and temperature variation. | when a population experiences temporal changes in the vital rates due to environmental or biotic variation, change is not only expected in the rate of population growth but also in the structure of the population. in this study we present a method for transforming observed patterns (notably how vital rates change with temperature) into functions that can be used in population growth models and analysis of population structure. the method is exemplified by applying it to cohort studies in differe ... | 1993 | 28313441 |
| the effect of landscape complexity and microclimate on the thermal tolerance of a pest insect. | landscape changes are known to exacerbate the impacts of climate change. as such, understanding the combined effect of climate and landscape on agroecosystems is vital if we are to maintain the function of agroecosystems. this study aimed to elucidate the effects of agricultural landscape complexity on the microclimate and thermal tolerance of an aphid pest to better understand how landscape and climate may interact to affect the thermal tolerance of pest species within the context of global cli ... | 2017 | 28322022 |
| why is there no impact of the host species on the cold tolerance of a generalist parasitoid? | for generalist parasitoids such as those belonging to the genus aphidius, the choice of host species can have profound implications for the emerging parasitoid. host species is known to affect a variety of life history traits. however, the impact of the host on thermal tolerance has never been studied. physiological thermal tolerance, enabling survival at unfavourable temperatures, is not a fixed trait and may be influenced by a number of external factors including characteristics of the stress, ... | 2017 | 29038015 |