Publications

TitleAbstractYear
Filter
PMID
Filter
effect of extended diapause on evolution of resistance to transgenic bacillus thuringiensis corn by northern corn rootworm (coleoptera: chrysomelidae).we develop a population genetics model for the northern corn rootworm, diabrotica barberi smith & lawrence, to examine the effect of extended diapause on the evolution of resistance to transgenic bacillus thuringiensis (bt) corn, zea mays l. we model conditions found in the center of the extended diapause problem along the minnesota-south dakota-iowa borders. the proportion of resistance alleles in eggs oviposited after 15 simulated years is used to measure the evolution of resistance. sensitivi ...200516539154
effectiveness of glues used for harmonic radar tag attachment and impact on survival and behavior of three insect pests.the ability of three cyanoacrylate glues to ensure a durable bond between the colorado potato beetle, leptinotarsa decemlineata (say), the plum curculio, conotrachelus nenuphar (herbst), or the corn rootworms (western corn rootworm, diabrotica virgifera virgifera leconte and northern corn rootworm, diabrotica longicornis smith and lawrence) and the harmonic radar tag without impact on behavior and survival was assessed as part of a study on the use of harmonic radar technology to track these ins ...200919791611
polymorphic microsatellite loci from northern and mexican corn rootworms (insecta: coleoptera: chrysomelidae) and cross-amplification with other diabrotica spp.the northern corn rootworm (diabrotica barberi) and mexican corn rootworm (diabrotica virgifera zeae) are significant agricultural pests. for the northern corn rootworm, and to a lesser extent, the mexican corn rootworm, high resolution molecular markers are needed. here we present 14 polymorphic microsatellite loci isolated from libraries constructed using pooled northern and mexican corn rootworm genomic dna. polymorphism in other diabrotica, including the banded cucumber beetle, southern corn ...200821585878
a multi-scale, landscape approach to predicting insect populations in agroecosystems.landscape composition affects ecosystems services, including agricultural pest management. however, relationships between land use and agricultural insects are not well understood, and many complexities remain to be explored. here we examine whether nonagricultural landscapes can directly suppress agricultural pests, how multiple spatial scales of land use concurrently affect insect populations, and the relationships between regional land use and insect populations. we tracked densities of three ...201121830718
effects of field history on corn root injury and adult abundance of northern and western corn rootworm (coleoptera: chrysomelidae).western corn rootworm, diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae), and northern corn rootworm, diabrotica barberi smith & lawrence, are major pests of corn (zea mays l.). corn producing bacillus thuringiensis (bt) toxins are widely used to manage diabrotica spp.; however, bt resistance by d. v. virgifera has led to high levels of feeding injury in the field. we tested whether field history affected root injury and abundance of adult diabrotica spp. in 2013 and 2014, four ...201627498115
effects of pyramided bt corn and blended refuges on western corn rootworm and northern corn rootworm (coleoptera: chrysomelidae).the western corn rootworm, diabrotica virgifera virgifera leconte, and the northern corn rootworm, diabrotica barberi smith & lawrence (coleoptera: chrysomelidae), are major pests of corn (zea mays l). several transgenic corn events producing insecticidal toxins derived from the bacterium bacillus thuringiensis (bt) kill corn rootworm larvae and reduce injury to corn roots. however, planting of bt corn imposes selection on rootworm populations to evolve bt resistance. the refuge strategy and pyr ...201526470183
susceptibility of northern corn rootworm diabrotica barberi (coleoptera: chrysomelidae) to mcry3a and ecry3.1ab bacillus thuringiensis proteins.the susceptibility of the northern corn rootworm diabrotica barberi (smith & lawrence) to mcry3a and ecry3.1ab proteins derived from bacillus thuringiensis (bt) was determined using a diet bioassay. northern corn rootworm neonates were exposed to different concentrations of mcry3a and ecry3.1ab, incorporated into artificial diet. larval mortality was evaluated after 7 d. the mcry3a and ecry3.1ab proteins were found to be toxic to the northern corn rootworm larvae. the lc50 and lc99 values for mc ...201626140383
effect of bt maize and soil insecticides on yield, injury, and rootworm survival: implications for resistance management.a 2-yr field experiment was conducted to determine the effects on diabrotica spp. (coleoptera: chrysomelidae) of an insecticidal seed treatment (poncho 1250, (ai)/clothianidin) and a granular insecticide (aztec 2.1g, (ai)/tebupirimphos and cyfluthrin) alone and in combination with maize producing the insectidical toxin cry3bb1 derived from the bacterium bacillus thuringiensis (bt). yields for bt maize plots were significantly greater than for non-bt maize; however, insecticides did not significa ...201324224233
interactions among bt maize, entomopathogens, and rootworm species (coleoptera: chrysomelidae) in the field: effects on survival, yield, and root injury.a 2 yr field study was conducted to determine how a blend of entomopathogens interacted with bt maize to affect mortality of diabrotica spp. (coleoptera: chrysomelidae), root injury to maize (zea maize l.) and yield. the blend of entomopathogens included two entomopathogenic nematodes, steinernema carpocapsae weiser and heterorhabditis bacteriophora poinar, and one entomopathogenic fungus, metarhizium brunneum (metschnikoff) sorokin. bt maize (event das59122-7, which produces bt toxin cry34/35ab ...201323786047
effects of rag1 on the preference and performance of soybean defoliators.the rag1 gene confers antibiotic resistance to soybean aphid, aphis glycines matsumura (hemiptera: aphididae), and in 2010, varieties expressing rag1 were released for commercial use in the united states. we do not know how rag1 varieties will influence the broader community of defoliating insects that inhabit soybean fields. in 2010 and 2011, the preference and performance of pest insects that defoliate soybeans [glycines max (l.) merr] were tested using rag1 and aphid-susceptible varieties. th ...201324498760
evolution of diabroticite rootworm beetle (chrysomelidae) receptors for cucurbita blossom volatiles.the diabroticite rootworm beetles coevolved with plants of the family cucurbitaceae as demonstrated by their feeding dependence on the tetracyclic triterpenoid cucurbitacins. these beetles also exhibit strong attraction to phenylpropanoid volatile components of cucurbita blossoms. a mixture of 1,2,4-trimethoxybenzene, indole, and (e)-cinnamaldehyde, all blossom components, is highly attractive to the several species of diabroticite cucumber beetles and corn rootworms and is considered a simplifi ...199111607158
effect of seed blends and soil-insecticide on western and northern corn rootworm emergence from mcry3a+ecry3.1ab bt maize.seed blends containing various ratios of transgenic bt maize (zea mays l.) expressing the mcry3a+ecry3.1ab proteins and non-bt maize (near-isoline maize) were deployed alone and in combination with a soil applied pyrethroid insecticide (force cs) to evaluate the emergence of the western corn rootworm, diabrotica virgifera virgifera leconte, in a total of nine field environments across the midwestern united states in 2010 and 2011. northern corn rootworm, diabrotica barberi smith & lawrence emerg ...201526470254
the complete mitochondrial genome of galeruca daurica (joannis) (coleoptera: chrysomelidae).abstracts galeruca daurica (joannis) (coleoptera: chrysomelidae) is one of important pests in the inner mongolia grasslands. the complete mitochondrial genome was sequenced. the genome is 16 615 bp long, with an at content of 78.1%, containing 37 typical animal mitochondrial genes and an at-rich region. all 13 pcgs share the start codon atn, and the usual termination codons (taa and tag) are found from 13 protein-coding genes, except for coi, coii, and nd4 (t). all the 22 typical animal trna gen ...201626122336
assembly and annotation of full mitochondrial genomes for the corn rootworm species, diabrotica virgifera virgifera and diabrotica barberi (insecta: coleoptera: chrysomelidae), using next generation sequence data.complete mitochondrial genomes for two corn rootworm species, diabrotica virgifera virgifera (16,747 bp) and diabrotica barberi (16,632; insecta: coleoptera: chrysomelidae), were assembled from illumina hiseq2000 read data. annotation indicated that the order and orientation of 13 protein coding genes (pcgs), and 22 trna and 2 rrna sequences were in typical of insect mitochondrial genomes. non-standard nad4 and cox3 stop codons were composed of single t nucleotides and likely completed by adenyl ...201424657060
abundance and distribution of western and northern corn rootworm (diabrotica spp.) and prevalence of rotation resistance in eastern iowa.the western corn rootworm diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae) and the northern corn rootworm diabrotica barberi smith & lawrence (coleoptera: chrysomelidae) are major pests of corn (zea mays l.). historically, crop rotation has been an effective management strategy, but both species have adapted to crop rotation in the midwest. for both species in eastern iowa, we measured abundance and prevalence of rotation resistance using sticky traps and emergence cages in fie ...201323448029
effectiveness of corn rootworm (coleoptera: chrysomelidae) areawide pest management in south dakota.diabrotica barberi smith & lawrence and diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae) are serious pests of maize, zea mays l. to reduce the amount of toxicants released into the environment, the agricultural research service implemented a 5-yr (1997-2001) areawide pest management program in five geographic locations, including one in south dakota. the objective was to use integrated pest management tactics to suppress adult diabrotica populations over a broad geographic area ...200717972631
a monitoring trap for diabrotica virgifera virgifera and d. barberi adults lured with a poisoned cucurbitacin bait.a trap is described that uses as a simple natural ingredient a cucurbitacin mixture to capture and carbaryl insecticide to kill northern and western corn rootworm beetles (diabrotica barberi smith and lawrence, and diabrotica virgifera virgifera leconte (d.v.v.), respectively). the trap is consistent in numbers of beetles captured per trap per day, and it should be useful in integrated pest management programs to monitor the population density of rootworm beetles in corn fields. captures between ...200315149093
transect sampling to enhance efficiency of corn rootworm (coleoptera: chrysomelidae) monitoring in corn.crop monitoring for adult corn rootworms, diabrotica virgifera virgifera leconte and diabrotica barberi smith and lawrence, remains the best means to assess fields at risk from this pest if replanted to corn, zea mays (l.). improvements in sampling methodology, including the development of a sequential sampling plan, have reduced the minimum sampling time required to make a management decision to 20 min or less per field per visit. however, many growers and crop consultants still find this time ...200314650514
multiplex polymerase chain reaction method for differentiating western and northern corn rootworm larvae (coleoptera: chrysomelidae).western corn rootworm, diabrotica virgifera virgifera leconte, and northern corn rootworm, d. barberi smith and lawrence, are sympatric species and serious pests of corn cultivation in north america. comparison of nucleotide sequence of mitochondrial cytochrome oxidase i and ii was used to design polymerase chain reaction (pcr) primers that discriminate immature stages of the two species based on differences in amplicon size. multiplex pcr can be used to give a positive test for each species in ...200312852603
comparison of adult corn rootworm (coleoptera: chrysomelidae) sampling methods.studies were conducted in kansas corn and soybean fields during 1997 to compare various sampling methods, traps, and trap components for capturing three species of adult corn rootworms: western (diabrotica virgifera virgifera leconte), southern (d. undecimpunctata howardi barber), and northern (d. barberi smith & lawrence). lure constituents affected the species of beetle attracted to the trap. traps with a lure containing 4-methoxycinnamaldehyde attracted more western corn rootworms, those with ...200211942770
single and blended maize volatiles as attractants for diabroticite corn rootworm beetles.synthetic maize volatiles and analogs dispensed singly and blended were tested for attractiveness to western (wcr, diabrotica virgifera virgifera) and northern corn rootworm beetles (ncr, d. barberi) in maize fields. newly identified attractants included syn-benzaldoxime, especially for ncr, and beta-caryophyllene for wcr females. (+/-)-linalool was more effective than was (-)-linalool. myrcene, (+)-beta-pinene, and (-)-beta-pinene were unattractive. adding methyl salicylate to (+/-)-linalool, ( ...200111504034
allozyme gene diversities in some leaf beetles (coleoptera: chrysomelidae).gene diversity at allozyme loci was investigated in the bean leaf beetle, ceratoma trifurcata forster; the elm leaf beetle, xanthogaleruca luteola (muller); the cottonwood leaf beetle, chrysomela scripta fabricus; the western corn rootworm, diabrotica virgifera virgifera leconte; the southern corn rootworm, also called the spotted cucumber beetle, d. undecimpunctata howardi baker; the northern corn rootworm, d. barberi smith and lawrence; and the colorado potato beetle, leptinotarsa decemlineata ...199910624512
identification of a female-produced sex pheromone of the western corn rootworm.a sex pheromone has been isolated and identified from virgin females of the western corn rootworm (wcr),diabrotica virgifera virgifera leconte. the synthesized compound, racemic 8-methyl-2-decanol propanoate, was equal in attraction to the natural pheromone when tested in the field as a trap bait against three taxa ofdiabrotica known to respond to pheromone extracts from female wcr. five taxa (d. virgifera virgifera; d. virgifera zeae krysan and smith, mexican corn rootworm;d. longicornis barber ...198224414965
a selective insecticidal protein from pseudomonas mosselii for corn rootworm control.the coleopteran insect western corn rootworm (wcr, diabrotica virgifera virgifera) is an economically important pest in north america and europe. transgenic corn plants producing bacillus thuringiensis (bt) insecticidal proteins have been useful against this devastating pest, but evolution of resistance has reduced their efficacy. here we report the discovery of a novel insecticidal protein, pip-47aa, from an isolate of pseudomonas mosselii. pip-47aa sequence shows no shared motifs, domains or s ...201728796437
field trial performance of herculex xtra (cry34ab1/cry35ab1) and smartstax (cry34ab1/cry35ab1 + cry3bb1) hybrids and soil insecticides against western and northern corn rootworms (coleoptera: chrysomelidae).western corn rootworm, diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae), and northern corn rootworm, diabrotica barberi smith and lawrence (coleoptera: chrysomelidae), are important insect pests in corn, zea mays l. for more than a decade, growers have been using transgenic plants expressing proteins from the bacterium bacillus thuringiensis (bt) to protect corn roots from feeding. in 2011, western corn rootworm populations were reported to have developed resistance to bt hybri ...201728430986
prairie grasses as hosts of the northern corn rootworm (coleoptera: chrysomelidae).we evaluated 27 prairie grass species thought to be among those dominant 200 yr ago in the northern midwest as larval hosts of the northern corn rootworm, diabrotica barberi smith and lawrence. maize (zea mays l.), spring wheat (triticum aestivum l.), and grain sorghum (sorghum bicolor l.) were included as controls for a total of 30 species. twenty pots of each species were planted in a randomized complete block design. each pot was infested 5 wk later with 20 neonate northern corn rootworm larv ...200818348817
transgenic bt corn, soil insecticide, and insecticidal seed treatment effects on corn rootworm (coleoptera: chrysomelidae) beetle emergence, larval feeding injury, and corn yield in north dakota.northern, diabrotica barberi smith & lawrence (coleoptera: chrysomelidae), and western, diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae), corn rootworms are economic pests of corn, zea mays l. in north america. we measured the impacts of corn hybrids incorporated with cry3bb1, cry34/35ab1, and pyramided (cry3bb1 + cry34/35ab1) bacillus thuringiensis berliner (bt) proteins, tefluthrin soil insecticide, and clothianidin insecticidal seed treatment on beetle emergence, larval feed ...201729186516
frequency and distribution of extended diapause in nebraska populations of diabrotica barberi (coleoptera: chrysomelidae).the frequency of extended diapause in populations of the northern corn rootworm, diabrotica barberi smith & lawrence (coleoptera: chrysomelidae), was measured in eastern nebraska. adult collections were made during late summer in 2008 and 2009 from eight sites each year (seven sites were consistent over years). eggs were obtained from 12 to 20 females per site and were held on moist soil under appropriate temperature profiles to facilitate egg survival, diapause development, and diapause termina ...201324020274
landscape features and spatial distribution of adult northern corn rootworm (coleoptera: chrysomelidae) in the south dakota areawide management site.the northern corn rootworm, diabrotica barberi smith & lawrence (coleoptera: chrysomelidae), creates economic and environmental concerns in the corn belt. to supplement the population control tactics of the areawide pest management program in brookings, sd, geographic information systems were used from 1997 to 2001 to examine the spatial relationships between d. barberi population dynamics and habitat structure, soil texture, and elevation. using the inverse distance weighted interpolation techn ...200415666749
emergence of adult northern and western corn rootworms (coleoptera: chrysomelidae) following reduced soil insecticide applications.a 3-yr investigation was conducted in commercial corn, zea mays (l.), fields in eastern south dakota to determine how reduced application rates of planting-time soil insecticides would influence temporal emergence patterns and survival of northern and western corn rootworms, diabrotica barberi smith and lawrence, and d. virgifera virgifera leconte, respectively. beetle emergence was monitored at 2-d intervals throughout the entire adult emergence period of three growing seasons from corn plots t ...200312852609
control of larval northern corn rootworm. (diabrotica barberi) with two steinernematid nematode species.the entomogenous nematodes steinerema feltiae and s. bibionis did not penetrate the roots of corn, zea mays, to infect larval northern corn rootworm (ncr), diabrotica barberi, feeding within. laboratory bioassays against first instar ncr indicated that s. feltiae, mexican strain (ld = 49 nematodes/insect) is more virulent than s. bibionis (ld = 100). numbers of ncr larvae in a grain corn crop were reduced by both nematode species applied at corn seeding time at the rate of 10,000 infective-stage ...199019287699
evaluation of smartstax and smartstax pro maize against western corn rootworm and northern corn rootworm: efficacy and resistance management.cases of western corn rootworm (wcr) field-evolved resistance to cry3bb1 and other corn rootworm (crw) control traits have been reported. pyramid products expressing multiple crw traits can delay resistance compared to single trait products. we used field studies to assess the pyramid crw corn products, smartstax (expressing cry3bb1 and cry34ab1/cry35ab1) and smartstax pro (expressing cry3bb1, cry34ab1/cry35ab1 and dvsnf7), at locations with high wcr densities and possible cry3bb1 resistance, an ...201728195683
field capture of northern and western corn rootworm beetles relative to attractant structure and volatility.we used field assays to study attraction of feral northern and western corn rootworm beetles (diabrotica barberi and d. virgifera virgifera) to a series of mostly nitrogenous and benzenoid synthetic compounds allied with host plant and floral aromas. vaporization rates were obtained for most field-tested compounds and selected additional lures under both ideal and field-representative, but constant, conditions. although many test compounds showed at least trace activity for one or both species, ...200415586676
larval sampling and instar determination in field populations of northern and western corn rootworm (coleoptera: chrysomelidae).abundance and head capsule width were measured for northern (diabrotica barberi smith & lawrence) and western corn rootworm (d. virgifera virgifera leconte) larvae recovered primarily from maize root systems but also from large soil cores each centered around a root system. larvae for measurement derived from field populations under infestation and rotation regimes that allowed most specimens to be assigned to species. a frequency distribution of head capsule widths indicated three separate peak ...200314503586
stochastic dynamic population model for northern corn rootworm (coleoptera: chrysomelidae).a stochastic dynamic population model for the complete life cycle of northern corn rootworm, diabrotica barberi smith & lawrence, is described. adult population dynamics from emergence to oviposition are based on a published single-season model for which temperature-dependent development and age-dependent advancement determine adult population dynamics and oviposition. randomly generated daily temperatures make this model component stochastic. stochastic hatch is 50+/-8%. a stochastic nonlinear ...200111425012
corn volatiles as attractants for northern and western corn rootworm beetles (coleoptera: chrysomelidae:diabrotica spp.).synthetic corn volatiles and selected analogs were tested in commercial corn fields for attractiveness to feral northern (ncr,diabrotica barberi) and western corn rootworm beetles (wcr,d. virgifera virgifera). two new attractants, geranylacetone and α-terpineol, were identified among corn terpenes and compared at four stages in crop development with the phenylpropanoid standards cinnamyl alcohol and 4-methoxy-cinnamaldehyde, with each component at 30 mg/trap. dose-response relationships (0.1-100 ...199624226082
stochastic simulation for characterizing ecological spatial patterns and appraising risk.the theory and a case study are presented for a class of techniques known as stochastic simulation. stochastic simulations can characterize the certainty of estimates of spatially and/or temporally correlated ecological variables. rather than merely providing a unique estimate, a conditional probability distribution is built for the unsampled location. this distribution provides the researcher with any summary statistic or confidence limit desired. moreover, the techniques are flexible enough to ...199327759279
responses of northern and western corn rootworms to semiochemical attractants in corn fields.small plots (18 × 18 m) were treated with grids of cotton wicks that contained semiochemicals for adultdiabrotica barberi smith and lawrence, the northern corn rootworm (ncr). in plots treated with eugenol (350 g/hectare), ncr were attracted to point sources of the compound, but there were no significant changes in numbers of either ncr ord. virgifera virgifera leconte, the western corn rootworm (wcr), found on plants in the plots. in plots treated with 12.5 mg/hectare of 8r-methyl-2r-decyl prop ...198824276203
semiochemical attractants ofdiabrotica undecimpunctata howardi barber, southern corn rootworm, anddiabrotica virgifera virgifera leconte, the western corn rootworm (coleoptera: chrysomelidae).during the summers of 1984 and 1985, a variety of structurally related benzenoid compounds was evaluated in sweet corn plots as attractants for adult southern corn rootworms (scr), western com rootworms (wcr), and northern corn rootworms (ncr). field response to the volatiles was measured by beetle counts on baited cylindrical sticky traps placed inside the corn plots at a height of l m above ground level. scr adults were attracted late in the season (last week of august through september, 1984 ...198724302061
response of northern corn rootworm,diabrotica barberi smith and lawrence, to stereoisomers of 8-methyl-2-decyl propanoate.the four stereoisomers of 8-methyl-2-decyl propanoate were tested in south dakota for attractiveness to the northern corn rootworm,diabrotica barberi smith and lawrence (ncr). only the 2r,8r configuration was attractive to the ncr. inhibition of the ncr response to 2r,8r occurred when either the 2s,8r or 2s,8s isomers were components of the pheromone source. the 2r,8s configuration elicited no behavioral activity in the ncr.198524311093
power and heat measurement by direct calorimetry of individual insect response to allelo- and toxic compounds.a microcalorimeter was constructed for the individual insect in order to measure the insect's power output as a function of time (the thermogram). the instrument has a figure of merit of 7 microw/microv. it includes a peltier pumped thermoelectric control loop which protects from intruding ambient thermals, and holds baseline drift to less than 2 microv/day. the design is a conventional twin, or differential heat conduction calorimeter, with two insect-holding vessels of glass. the vessels are c ...19827069131
Displaying items 1 - 41 of 41