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Impact Of Trap Design, Windbreaks, And Weather On Captures Of European Corn Borer (Lepidoptera: Crambidae) In Pheromone-Baited Traps, Brendon James Reardon, Douglas V. Sumerford, Thomas W. Sappington Dec 2006

Impact Of Trap Design, Windbreaks, And Weather On Captures Of European Corn Borer (Lepidoptera: Crambidae) In Pheromone-Baited Traps, Brendon James Reardon, Douglas V. Sumerford, Thomas W. Sappington

Entomology Publications

Pheromone-baited traps are often used in ecological studies of the European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae). However, differences in trap captures may be confounded by trap design, trap location relative to a windbreak, and changes in local weather. The objectives of this experiment were, first, to examine differences in O. nubilalis adult (moth) captures among the Intercept wing trap, the Intercept bucket/funnel UNI trap, and the Hartstack wire-mesh, 75-cm-diameter cone trap (large metal cone trap) as well as among three cone trap designs. Second, we examined the influence of the location of the large metal cone trap ...


Dispersal Of Newly Eclosed European Corn Borer Adults (Lepidoptera: Crambidae) From Corn Into Small-Grain Aggregation Plots, Brendon James Reardon, Douglas V. Sumerford, Thomas W. Sappington Oct 2006

Dispersal Of Newly Eclosed European Corn Borer Adults (Lepidoptera: Crambidae) From Corn Into Small-Grain Aggregation Plots, Brendon James Reardon, Douglas V. Sumerford, Thomas W. Sappington

Entomology Publications

Genetically modified, insecticidal Bacillus thuringiensis (Bt) corn, Zea mays L., hybrids are used throughout the Corn Belt for European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae), control. To slow development of Bt corn resistance, the Environmental Protection Agency requires growers to plant a refuge. Determining the appropriate distance between a refuge and Bt corn, and development of mitigation–remediation strategies such as mass releases of susceptible moths, requires an understanding of adult dispersal and mating behavior. However, much remains unknown about these behaviors. Because mating often occurs in grass near cornfields where adult O. nubilalis aggregate, we planted small-grain plots ...


Influence Of Elm Foliar Chemistry For The Host Suitability Of The Japanese Beetle, Popillia Japonica, And The Gypsy Moth, Lymantria Dispar, Gretchen Paluch, Fredric Miller, Junwei Zhu, Joel R. Coats Oct 2006

Influence Of Elm Foliar Chemistry For The Host Suitability Of The Japanese Beetle, Popillia Japonica, And The Gypsy Moth, Lymantria Dispar, Gretchen Paluch, Fredric Miller, Junwei Zhu, Joel R. Coats

Entomology Publications

The Asian elm trees that are closely associated with the David complex, Ulmus davidana (Planch), U. propinqua (Koidz), U. japonica (Rehd.), and U. wilsoniana (Schneid), show substantial levels of disease resistance and tolerance. Studies have shown that these species suffer moderate levels of injury from the adult Japanese beetle, Popillia japonica (Newman) (Coleoptera: Scarabaeidae). The research presented here reports the influence of elm leaf chemistry on the feeding activity of two generalist herbivores, the Japanese beetle and gypsy moth, Lymantria dispar (L.) (Lepidoptera: Lymantriidae). Elm leaf chemistry was surveyed for 19 species, 5 cultivars, and 2 varieties that are known ...


Using Genetic Markers And Population Assignment Techniques To Infer Origin Of Boll Weevils (Coleoptera: Curculionidae) Unexpectedly Captured Near An Eradication Zone In Mexico, Kyung Seok Kim, Pedro Cano-Rios, Thomas W. Sappington Aug 2006

Using Genetic Markers And Population Assignment Techniques To Infer Origin Of Boll Weevils (Coleoptera: Curculionidae) Unexpectedly Captured Near An Eradication Zone In Mexico, Kyung Seok Kim, Pedro Cano-Rios, Thomas W. Sappington

Entomology Publications

Several boll weevils, Anthonomus grandis Boheman, were captured in pheromone traps in 2004 near Tlahualilo, Durango, Mexico, an area where none had been reported for ≈10 yr. It is possible that they were from an endemic population normally too low in numbers to be detected but that increased in response to more favorable rainfall conditions in 2004. Alternatively, they may represent an influx of migrants or the immediate descendents of migrants. To identify the most likely origin of the boll weevils captured in this area, we characterized microsatellite variation of the Tlahualilo weevils and compared it with the variation from ...


Coordinated Diabrotica Genetics Research: Accelerating Progress On An Urgent Insect Pest Problem, Thomas W. Sappington, Blair D. Siegfried, Thomas Guillemaud Jul 2006

Coordinated Diabrotica Genetics Research: Accelerating Progress On An Urgent Insect Pest Problem, Thomas W. Sappington, Blair D. Siegfried, Thomas Guillemaud

Entomology Publications

No abstract provided.


Natural Insect Repellents: Activity Against Mosquitoes And Cockroaches, Gretchen Schultz, Chris Peterson, Joel R. Coats May 2006

Natural Insect Repellents: Activity Against Mosquitoes And Cockroaches, Gretchen Schultz, Chris Peterson, Joel R. Coats

Entomology Publications

Recent research has focused on the repellent properties of extracts from the catnip plant (Nepeta cataria) and the Osage orange (Madura pomifera) fruit. This chapter includes results on German cockroach (Blattella germanica), and house fly (Musca domestica) contact irritancy to catnip essential oil, and its major components, Z,E-nepetalactone and E,Z-nepetalactone, compared with the commercial standard, N,Ndiethyl-m-toluamide (DEET). Both species showed high percentage repellency values when exposed to filter paper treated with catnip essential oil or the individual nepetalactone isomers. Of the two nepetalactone isomers evaluated, German cockroaches were most responsive to the E ...


Molecular Genetic Variation Of Boll Weevil Populations In North America Estimated With Microsatellites: Implications For Patterns Of Dispersal, Kyung Seok Kim, Thomas W. Sappington May 2006

Molecular Genetic Variation Of Boll Weevil Populations In North America Estimated With Microsatellites: Implications For Patterns Of Dispersal, Kyung Seok Kim, Thomas W. Sappington

Entomology Publications

The boll weevil (Anthonomus grandis Boheman) is an insect pest of cotton that underwent a well-documented range expansion across the southeastern U.S. from Mexico beginning about 110 years ago. Eleven microsatellite loci were surveyed to infer the magnitude and pattern of genetic differentiation among boll weevil populations from 18 locations across eight U.S. states and northeast Mexico. Estimates of genetic diversity (allelic diversity and heterozygosity) were greater in Southern than Northern populations, and were greater in the west than the east among Northern populations. Boll weevil populations were genetically structured as a whole across the geographic range sampled ...


Dispersal Of Boll Weevils (Coleoptera: Curculionidae) From Cotton Modules Before Ginning, Thomas W. Sappington, Mark D. Arnold, Alan D. Brashears, Megha N. Parajulee, Stanley C. Carroll, Allen E. Knutson, John W. Norman Jr. Feb 2006

Dispersal Of Boll Weevils (Coleoptera: Curculionidae) From Cotton Modules Before Ginning, Thomas W. Sappington, Mark D. Arnold, Alan D. Brashears, Megha N. Parajulee, Stanley C. Carroll, Allen E. Knutson, John W. Norman Jr.

Entomology Publications

We characterized the level of risk of boll weevil, Anthonomus grandis grandis Boheman, reintroduction to an eradication zone posed by dispersal from cotton modules during and after transport to the gin. Mark–release-recapture experiments in August and September in Texas indicated that most weevils disperse rapidly from the module surface, temperature permitting, unless confined under a module tarp, where most died. Nevertheless, 1–5% of released weevils were recovered alive after 24 h on the side and top surfaces of modules, representing potential dispersants. Mortality of boll weevils caged on the top surface of a module was 95–100% after ...


Sequence Variation In Trypsin- And Chymotrypsin-Like Cdnas From The Midgut Of Ostrinia Nubilalis : Methods For Allelic Differentiation Of Candidate Bacillus Thuringiensis Resistance Genes, Brad S. Coates, Richard L. Hellmich, Leslie C. Lewis Jan 2006

Sequence Variation In Trypsin- And Chymotrypsin-Like Cdnas From The Midgut Of Ostrinia Nubilalis : Methods For Allelic Differentiation Of Candidate Bacillus Thuringiensis Resistance Genes, Brad S. Coates, Richard L. Hellmich, Leslie C. Lewis

Entomology Publications

Midgut expressed alkaline serine proteases of Lepidoptera function in conversion of Bacillus thuringiensis (Bt) protoxin to active toxin, and reduced level of transcript T23 is associated with Ostrinia nubilalis resistance to Dipel® Bt formulations. Three groups of trypsin- (OnT25, OnT23, and OnT3) and two chymotrypsin-like (OnC1 and OnC2) cDNAs were isolated from O. nubilalis midgut tissue. Intraspecific groupings are based on cDNA similarity and peptide phylogeny. Derived serine proteases showed a catalytic triad (His, Asp, and Ser; except transcript OnT23a), three substrate specificity-determining residues, and three paired disulphide bonds. RT-PCR indicated all transcripts are expressed in the midgut. Mendelian-inherited genomic ...