Open Access. Powered by Scholars. Published by Universities.®

Entomology Commons™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 7381 - 7410 of 11445

Full-Text Articles in Entomology

Mortalités Et Dépopulations Des Colonies D’Abeilles Domestiques : Le Cas Américain, Yves Le Conte, Marion D. Ellis Jan 2008

Mortalités Et Dépopulations Des Colonies D’Abeilles Domestiques : Le Cas Américain, Yves Le Conte, Marion D. Ellis

Department of Entomology: Faculty Publications

Après la France et l’Europe, l’Amérique du Nord subit des problèmes de mortalités massives d’abeilles. Un déficit d’abeilles pour la pollinisation et les résultats d’enquêtes auprès des apiculteurs attestent clairement que ce phénomène est très préoccupant pour l’apiculture américaine. Le déclin de ce pollinisateur peut constituer un problème environnemental grave pour les écosystèmes.

Go to article

A Technique To Morphologically Differentiate Larvae Of Diabrotica Virgifera Virgifera And D. Barberi (Coleoptera: Chrysomelidae), Sabine C. Becker, Lance J. Meinke Jan 2008

A Technique To Morphologically Differentiate Larvae Of Diabrotica Virgifera Virgifera And D. Barberi (Coleoptera: Chrysomelidae), Sabine C. Becker, Lance J. Meinke

Department of Entomology: Faculty Publications

The western corn rootworm (WCR), Diabrotica virgifera virgifera LeConte and northern corn rootworm (NCR) Diabrotica barberi Smith are key pests of corn in the north-central United States (Chiang, 1973; Levine and Oloumi-Sadeghi, 1991). Both species are commonly found as larvae in the same cornfields in areas where geographic distributions overlap. Attempts to distinguish larvae of each species using external characters have proven to be difficult. Mendoza and Peters (1964) reported that differences in anal plate (pygidial shield) morphology could be used to separate larvae of each species. The WCR generally has a notched, dark brown anal plate whereas the anal …

Go to article

Use Of Spectral Vegetation Indices Derived From Airborne Hyperspectral Imagery For Detection Of European Corn Borer Infestation In Iowa Corn Plots, Matthew W. Carroll, John A. Glaser, Richard L. Hellmich, Thomas E. Hunt, Thomas W. Sappington, Dennis Calvin, Ken Copenhaver, Jon Fridgen Jan 2008

Use Of Spectral Vegetation Indices Derived From Airborne Hyperspectral Imagery For Detection Of European Corn Borer Infestation In Iowa Corn Plots, Matthew W. Carroll, John A. Glaser, Richard L. Hellmich, Thomas E. Hunt, Thomas W. Sappington, Dennis Calvin, Ken Copenhaver, Jon Fridgen

Department of Entomology: Faculty Publications

Eleven spectral vegetation indices that emphasize foliar plant pigments were calculated using airborne hyperspectral imagery and evaluated in 2004 and 2005 for their ability to detect experimental plots of corn manually inoculated with Ostrinia nubilalis (Hübner) neonate larvae. Manual inoculations were timed to simulate infestation of corn, Zea mays L., by first and second fiights of adult O. nubilalis. The ability of spectral vegetation indices to detect O. nubilalis-inoculated plots improved as the growing season progressed, with multiple spectral vegetation indices able to identify infested plots in late August and early September. Our findings also indicate that for …

Go to article

Agroecossistemas Orizícolas Irrigados: Insetos-Praga, Imimigos Naturais E Manejo Integrado, Leila Lucia Fritz, Elvis Arden Heinrichs, Marciele Pandolfo, Silvia Martins De Salles, Jaime Vargas De Oliveira, Lidia Mariana Fiuza Jan 2008

Agroecossistemas Orizícolas Irrigados: Insetos-Praga, Imimigos Naturais E Manejo Integrado, Leila Lucia Fritz, Elvis Arden Heinrichs, Marciele Pandolfo, Silvia Martins De Salles, Jaime Vargas De Oliveira, Lidia Mariana Fiuza

Department of Entomology: Faculty Publications

Nos ecossistemas de produção de arroz irrigado, os insetos-praga são considerados uma das limitações na produção mundial. Diante desse fato, diversas formas de controle vêm sendo pesquisadas para minimizar o problema. O uso contínuo de produtos fitossanitários ocasiona a resistência das pragas, além do aumento da população de pragas secundárais. Como alternativa, o uso do controle biológico, através de inimigos naturais, como predadores, parasitóides e patógenos, se revela capaz de regular as pragas em seu ambiente natural, reduzindo a densidade das populações e conseqüentemente os danos às plantas hospedeiras. Sendo assim, nesse trabalho de revisão são apresentados dados sobre a …

Go to article

Quantification Of Pollinating Insects Of The Superfamily Apoidea In Three Ecological Niches Of Three Communities In The Municipality Of Coroico-Nor Yungas, Department Of La Paz, Óscar Jaime Claros Sossa Jan 2008

Quantification Of Pollinating Insects Of The Superfamily Apoidea In Three Ecological Niches Of Three Communities In The Municipality Of Coroico-Nor Yungas, Department Of La Paz, Óscar Jaime Claros Sossa

Theses and Dissertations

The superfamily Apoidea (commonly referred to as bees), are insects whose diet consists of the nectar and pollen from flowering plants. Therefore, they are essential pollinators of many species, both wild and cultivated.
Bees are similar to other Hymenoptera in appearance, size, and color variety. The superfamily Apoidea contains 17,000 known species and could possibly contain up to 30,000. Bees perform many tasks that benefit humanity such as pollinating the flowers of both wild and cultivated plants. Without this work, fruits and seeds necessary for the survival of different species, for our own food supply, and for industry would not …

Go to article

Two New Termite (Isoptera: Rhinotermitidae) Feeding Indexes For Woods Of Varying Palatability, C. J. Peterson, P. D. Gerard Jan 2008

Two New Termite (Isoptera: Rhinotermitidae) Feeding Indexes For Woods Of Varying Palatability, C. J. Peterson, P. D. Gerard

Midsouth Entomologist

In order for bait matrices, treated wood and resistant wood species to be properly evaluated in the laboratory for termite resistance or palatability, reliable tests that can distinguish between food choices must be developed; otherwise, inferior products may enter the marketplace. In the current study, a bioassay method is proposed that allows the calculation of two new feeding indexes, a Wood Resistance Index (WRI) and a Termite Preference Index (TPI). These indexes incorporate the feeding behavior of termites in both choice and no-choice situations. In tests using Reticulitermes flavipes (Kollar), the WRI consistently provided statistically significant comparisons between three wood …

Go to article

Rediscovery Of Pogonomyrmex Badius (Latreille) (Hymenoptera: Formicidae) In Mainland Mississippi, With An Analysis Of Associated Seeds And Vegetation, J. A. Macgown, J. G. Hill, L. C. Majure, J. L. Setzer Jan 2008

Rediscovery Of Pogonomyrmex Badius (Latreille) (Hymenoptera: Formicidae) In Mainland Mississippi, With An Analysis Of Associated Seeds And Vegetation, J. A. Macgown, J. G. Hill, L. C. Majure, J. L. Setzer

Midsouth Entomologist

Pogonomyrmex badius (Latreille)was considered to be a relatively common species in central and southern Mississippi before the introduction of the imported fire ants, Solenopsis invicta and S. richteri, and before subsequent area wide control measures, but it has not been reported from the mainland since the mid 1930's. Recent collections in a relic sandhill community in Smith County have resulted in the rediscovery of this species in central Mississippi. Colony characteristics and microhabitat of P. badius are described. Observations of P. badius and other ant species found walking on the P. badius craters are provided. Seeds found in middens and …

Go to article

Comparison And Validation Of Methods To Quantify Cry1ab Toxin From Bacillus Thuringiensis For Standardization Of Insect Bioassays, Andre L. B. Crespo, Terrence A. Spencer, Emily Nekl, Marianne Pusztai-Carey, William J. Moar, Blair D. Siegfried Jan 2008

Comparison And Validation Of Methods To Quantify Cry1ab Toxin From Bacillus Thuringiensis For Standardization Of Insect Bioassays, Andre L. B. Crespo, Terrence A. Spencer, Emily Nekl, Marianne Pusztai-Carey, William J. Moar, Blair D. Siegfried

Department of Entomology: Faculty Publications

Standardization of toxin preparations derived from Bacillus thuringiensis (Berliner) used in laboratory bioassays is critical for accurately assessing possible changes in the susceptibility of field populations of target pests. Different methods were evaluated to quantify Cry1Ab, the toxin expressed by 80% of the commercially available transgenic maize that targets the European corn borer, Ostrinia nubilalis (Hubner). We compared three methods of quantification on three different toxin preparations from independent sources: enzyme-linked immunosorbent assay (ELISA), sodium dodecyl sulfate-polyacrylamide gel electrophoresis and densitometry (SDS-PAGE/densitometry), and the Bradford assay for total protein. The results were compared to those obtained by immunoblot analysis and …

Go to article

Effects Of The Synergist S,S,S-Tributyl Phosphorotrithioate On Indoxacarb Toxicity And Metabolism In The European Corn Borer, Ostrinia Nubilalis (Hübner), Analiza P. Alves, William J. Allgeier, Blair D. Siegfried Jan 2008

Effects Of The Synergist S,S,S-Tributyl Phosphorotrithioate On Indoxacarb Toxicity And Metabolism In The European Corn Borer, Ostrinia Nubilalis (Hübner), Analiza P. Alves, William J. Allgeier, Blair D. Siegfried

Department of Entomology: Faculty Publications

The toxicity of the oxadiazine insecticide indoxacarb to the European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae), was evaluated in the presence and absence of S,S,S-tributyl phosphorotrithioate (DEF), an inhibitor of hydrolytic metabolism. Bioassays involving topical application of different concentrations of indoxacarb to third instars of a susceptible O. nubilalis laboratory strain were performed, and in vitro metabolism experiments involving [14C] indoxacarb were examined to determine the role of hydrolytic metabolism in indoxacarb activation. Indoxacarb toxicity decreased in the presence of DEF indicating antagonism of toxicity. Results of in vivo and in vitro inhibition experiments indicated a …

Go to article

Predation Of The Chinch Bug, Blissus Occiduus Barber (Hemiptera: Blissidae) By Geocoris Uliginosus (Say) (Hemiptera: Lygaeidae), J. D. Carstens, Frederick P. Baxendale, Tiffany Heng-Moss, Robert J. Wright Jan 2008

Predation Of The Chinch Bug, Blissus Occiduus Barber (Hemiptera: Blissidae) By Geocoris Uliginosus (Say) (Hemiptera: Lygaeidae), J. D. Carstens, Frederick P. Baxendale, Tiffany Heng-Moss, Robert J. Wright

Department of Entomology: Faculty Publications

Big-eyed bugs have been well documented as predators on a diverse group of arthropod prey in turfgrasses; however, little is known about the big-eyed bug species associated with buffalograss, or their feeding habits relative to the western chinch bug, Blissus occiduus Barber. This research documented that Geocoris uliginosus (Say) was the predominant big-eyed bug species associated with buffalograss, obtained information on its feeding behavior, and characterized predation rates. Laboratory studies documented G. uliginosus, as a predator of B. occiduus. While all life stages of B. occiduus were attacked by G. uliginosus, predation was greater on 1st through …

Go to article

A Synopsis Of Nebraska Grasshopper Distributions, Mathew L. Brust, William Wyatt Hoback, Robert J. Wright Jan 2008

A Synopsis Of Nebraska Grasshopper Distributions, Mathew L. Brust, William Wyatt Hoback, Robert J. Wright

Department of Entomology: Faculty Publications

Between 2005 and 2007, 656 new county records and eight new state records were obtained for Nebraska’s short-horned grasshoppers (Acrididae and Romaleidae). This represents an increase of 30% in the known grasshopper county records in Nebraska. Based on the large number of new distribution records, it appears that the previous distributions of Nebraska’s grasshoppers greatly underestimated the actual distributions. The new grasshopper state records were: Boopedon gracile, Chloealtis abdominalis, Encoptolophus subgracilis, Melanoplus bispinosus, Melanoplus borealis, Melanoplus punctulatus, Paratylotropidia brunneri, and Psinidia fenestralis were obtained. These new records will aid in both grasshopper monitoring for pest outbreaks and in conservation of …

Go to article

Bee-To-Bee Contact Drives Oxalic Acid Distribution In Honey Bee Colonies, Nicholas P. Aliano, Marion D. Ellis Jan 2008

Bee-To-Bee Contact Drives Oxalic Acid Distribution In Honey Bee Colonies, Nicholas P. Aliano, Marion D. Ellis

Department of Entomology: Faculty Publications

Nine divided hives were constructed to study the distribution of oxalic acid (OA). Experimental colonies were split into two equal, queenright sections with one of three divider types. The first divider allowed trophallaxis to occur between adult bees on each side, but did not allow bee-to-bee contact. The second divider did not allow trophallaxis or bee-to-bee contact. The third divider allowed both bee-to-bee contact and trophallaxis between the two sides. All three dividers allowed gas exchange of volatile materials. The objective was to investigate factors that contribute to the distribution of OA in a hive by monitoring Varroa destructor mortality. …

Go to article

Mortalités Et Dépopulations Des Colonies D’Abeilles Aux États-Unis, Marion D. Ellis, Yves Leconte Jan 2008

Mortalités Et Dépopulations Des Colonies D’Abeilles Aux États-Unis, Marion D. Ellis, Yves Leconte

Department of Entomology: Faculty Publications

Après la France et l’Europe, les États-Unis d’Amérique subissent de plein fouet les problèmes de mortalités massives d’abeilles. Un déficit d’abeilles disponibles pour la pollinisation et les résultats d’enquêtes auprès des apiculteurs attestent clairement ce phénomène très préoccupant pour l’apiculture américaine. Y a-t-il des analogies avec ce que nous avons vécu sur nos populations d’abeilles ou bien est-ce un phénomène différent ? L’état américain débloque des fonds importants pour expliquer et lutter contre ce syndrome qui détruit leur cheptel.

Go to article

Simulations With Elaborated Worked Example Modeling: Beneficial Effects On Schema Acquisition, Debra K. Meier, Karl J. Reinhard, David O. Carter, David W. Brooks Jan 2008

Simulations With Elaborated Worked Example Modeling: Beneficial Effects On Schema Acquisition, Debra K. Meier, Karl J. Reinhard, David O. Carter, David W. Brooks

Department of Entomology: Faculty Publications

Worked examples have been effective in enhancing learning outcomes, especially with novice learners. Most of this research has been conducted in laboratory settings. This study examined the impact of embedding elaborated worked example modeling in a computer simulation practice activity on learning achievement among 39 undergraduate students within a classroom environment. The students from one introductory forensic science course were randomly assigned to one of two groups that worked through computer-based simulations containing worked example modeling conditions presented in varied order. The computer software administered the modeled simulations, prior knowledge test, pretest, posttests, and a second domain test. Findings from …

Go to article

Using Banded Sunflower Moth (Lepidoptera: Tortricidae) Egg Density To Estimate Damage And Economic Distance In Oilseed Sunflower, Kirk D. Mundal, Gary J. Brewer Jan 2008

Using Banded Sunflower Moth (Lepidoptera: Tortricidae) Egg Density To Estimate Damage And Economic Distance In Oilseed Sunflower, Kirk D. Mundal, Gary J. Brewer

Department of Entomology: Faculty Publications

The banded sunflower moth, Cochylis hospes Walsingham (Lepidoptera: Tortricidae), is an important economic pest of sunflower in the Upper Great Plains of North America. Economic losses due to reductions in seed number, weight, and quality can be significant. Previously, the potential for economic losses were estimated by sampling for adult moths. However, sampling for moths can be difficult and inaccurate. An alternative is to sample for banded sunflower moth eggs, which can be accurately counted in the field by using a binocular 3.5 headband magnifier. The egg counts are used to calculate the economic injury level (EIL): EIL …

Go to article

Levels Of Tolerance, Antibiosis, And Antixenosis Among Resistant Buffalograsses And Zoysiagrasses, Thomas E. Eickhoff, Tiffany Heng-Moss, Frederick P. Baxendale, John E. Foster Jan 2008

Levels Of Tolerance, Antibiosis, And Antixenosis Among Resistant Buffalograsses And Zoysiagrasses, Thomas E. Eickhoff, Tiffany Heng-Moss, Frederick P. Baxendale, John E. Foster

Department of Entomology: Faculty Publications

The western chinch bug, Blissus occiduus Barber, has been documented as one of the most serious pests of buffalograss, Buchloë dactyloides (Nuttall) Engelmann, and zoysiagrass, Zoysia japonica Steudel, grown for turf in midwestern states. Resistance to the western chinch bug has been identified in both buffalograsses and zoysiagrasses. Choice and no-choice studies were conducted to determine the categories (antibiosis, antixenosis, and tolerance) of three resistant buffalograsses (PX3-5-1’, 196’, and 184’) and three resistant zoysiagrasses (El Toro, Emerald, and Zorro). Antibiosis studies found no significant differences in survival, nymphal development, or fecundity among the resistant and susceptible buffalograsses or zoysiagrasses, …

Go to article

Influence Of Temperature On Rate Of Uptake And Subsequent Horizontal Transfer Of [14C]Fipronil By Eastern Subterranean Termites (Isoptera: Rhinotermitidae), Neil A. Spomer, Shripat T. Kamble, Richard A. Warriner, Robert W. Davis Jan 2008

Influence Of Temperature On Rate Of Uptake And Subsequent Horizontal Transfer Of [14C]Fipronil By Eastern Subterranean Termites (Isoptera: Rhinotermitidae), Neil A. Spomer, Shripat T. Kamble, Richard A. Warriner, Robert W. Davis

Department of Entomology: Faculty Publications

The effect of temperature on [14C]fipronil uptake and transfer from donor (D) to recipient (R) Reticulitermes flavipes (Kollar) (Isoptera: Rhinotermitidae) workers was evaluated. Test chambers used in the fipronil uptake study were constructed from petri dishes containing autoclaved soil treated with 1 ppm [14C]fipronil (1.14 μCi of total radioactivity per petri dish), distilled water, and R. flavipes workers. Test chambers were held in environmental growth chambers preset at 12, 17, 22, 27, and 32°C. For the fipronil transfer study, donor termites stained with Nile blue-A were exposed to soil treated with 1 ppm [14C]fipronil …

Go to article

Oviposition Behavior Partitions Aquatic Landscapes Along Predation And Nutrient Gradients, C. A. Binckley, W. J. Resetarits Jr. Jan 2008

Oviposition Behavior Partitions Aquatic Landscapes Along Predation And Nutrient Gradients, C. A. Binckley, W. J. Resetarits Jr.

Biological Sciences Faculty Publications

That individuals attempt to minimize the ratio of mortality risk/growth rate (μ/g) when foraging within individual habitat patches is well established. Do species partition among spatially discrete communities embedded in complex landscapes in a similar manner? We investigated how 3 ovipositing species (2 Hyla treefrogs and a hydrophilid beetle, Tropisternus lateralis) responded to simultaneous gradients of nutrients and predation risk. Species partitioned our experimental metacommunity primarily by reducing oviposition with fish. Tropisternus positively responded to increased nutrients, but the effect decreased with increasing risk, as predicted by μ/g theory. Use of fish habitats by Tropisternus was unrelated to breeding …

Go to article

Using Rna Interference To Determine The Role Of Varisin In The Innate Immune System Of The Hard Tick Dermacentor Variabilis (Acari: Ixodidae)., Wayne L. Hynes, Martha M. Stokes, Shannon M. Hensley, S. Michelle Todd, Daniel E. Sonenshine Jan 2008

Using Rna Interference To Determine The Role Of Varisin In The Innate Immune System Of The Hard Tick Dermacentor Variabilis (Acari: Ixodidae)., Wayne L. Hynes, Martha M. Stokes, Shannon M. Hensley, S. Michelle Todd, Daniel E. Sonenshine

Biological Sciences Faculty Publications

Defensins are an important component of the innate immune system of ticks. These small peptides are produced by various genera of ticks, and expressed in various tissues. In this study we used RNA interference to silence the expression of the defensin varisin produced by the hemocytes of the American dog tick, Dermacentor variabilis. Ticks were injected with double stranded varisin RNA prior to being placed on a rabbit. After feeding, the ticks were removed, bled, and the hemolymph plasma and hemocytes separated. Hemocytes were screened for the presence (or absence) of both varisin transcript and peptide. Varisin peptide was …

Go to article

Volatile Compounds From The Integument Of White Leghorn Chickens (Gallus Gallus Domesticus L.): Candidate Attractants Of Ornithophilic Mosquito Species, Ulrich R. Bernier, Sandra A. Allan, Brian Quinn, Daniel Kline, Donald Barnard, Gary Clark Jan 2008

Volatile Compounds From The Integument Of White Leghorn Chickens (Gallus Gallus Domesticus L.): Candidate Attractants Of Ornithophilic Mosquito Species, Ulrich R. Bernier, Sandra A. Allan, Brian Quinn, Daniel Kline, Donald Barnard, Gary Clark

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Candidate kairomones of ornithophilic mosquito species are reported from GC/MS analysis of compounds from the skin on the back, the feet, and feathers from the back of White Leghorn chickens (Gallus gallus domesticus). Hexane and ether extracts of chicken feathers differ significantly in attractiveness of Culex spp. mosquitoes. The active (hexane) extracts contained an abundance of alcohols, ketones, and diones. The inactive (ether) extracts contained aldehydes, which also were in the hexane extracts. Analysis of hexane extracts from chicken feet, skin, and feathers demonstrated the qualitative similarity in the compounds collected with subtle differences observed in the quantitative …

Go to article

Concentration-Dependent Parsimonious Releaser Roles Of Gregarious Male Pheromone Of The Desert Locust, Schistocerca Gregaria, Edwin Rono, Peter G.N. Njagi, Magzoub O. Bashir, Ahmed Hassanali Jan 2008

Concentration-Dependent Parsimonious Releaser Roles Of Gregarious Male Pheromone Of The Desert Locust, Schistocerca Gregaria, Edwin Rono, Peter G.N. Njagi, Magzoub O. Bashir, Ahmed Hassanali

All Peer-Reviewed Publications

The responses of (i) groups of crowd-reared mature males of desert locust, Schistocerca gregaria to a choice of two columns of air, one permeated with different concentrations of phenylacetonitrile (PAN), the major component of gregarious-phase male-produced pheromone, and the other untreated, and (ii) individual crowd-reared mature males of the insect to varying concentration gradients of PAN, were studied in two different types of arena. In the choice assay, locusts preferred to be within PAN-permeated air column at low relative doses of the pheromone, but away from PAN at high relative doses. In the second assay, individual locusts were arrested close …

Go to article

Fleas, Erin W. Hodgson, Jay B. Karren, Alan H. Roe Jan 2008

Fleas, Erin W. Hodgson, Jay B. Karren, Alan H. Roe

All Current Publications

Fleas transmit disease and parasitic worms, and cause allergic dermatitis to humans and animals. There are about 2,000 different flea species in the world and at least 325 species in North America, all belonging to the order Siphonaptera. Fleas are not likely to be confused with other insects because adults are flattened dorsal-ventrally, or side-to-side.

Go to article

Human Lice, Erin W. Hodgson Jan 2008

Human Lice, Erin W. Hodgson

All Current Publications

Lice infestations on humans, called pediculosis, is very common worldwide. Lice can transmit disease and are parasitic insects on humans, pets and livestock. Lice belong to the order Phthiraptera and are generally divided into two groups based on mouthparts and feeding preferences. Chewing lice (Mallophaga) have well developed mandibles and eat skin, feathers, and fur from birds and mammals.

Go to article

Russian Wheat Aphid, Erin W. Hodgson, Jay B. Karren Jan 2008

Russian Wheat Aphid, Erin W. Hodgson, Jay B. Karren

All Current Publications

Russian wheat aphid, Diuraphis noxia (Hemiptera: Aphididae), was first found in the U.S. in 1986, and is currently found in 16 western states (Fig. 1). In Utah, Russian wheat aphid was first detected in wheat and barley in San Juan County in 1987; now it is confirmed in every Utah county but Daggett, Piute, and Rich. Russian wheat aphids can build up to high numbers and cause significant plant damage.

Go to article

Snow Mold On Turfgrass, Kent Evans, Erin Frank, Taun Beddes, Jaydee Gunnell Jan 2008

Snow Mold On Turfgrass, Kent Evans, Erin Frank, Taun Beddes, Jaydee Gunnell

All Current Publications

Shothole borers (Fig. 1) are bark beetles that may attack stressed or injured trees. They have a wide host range, including all fruit trees grown in Utah, quince, loquat, serviceberry, wild cherry, chokecherry, mountain ash, hawthorn and elm. In Utah, apple, cherry, pear, and hawthorn are preferred hosts.

Go to article

Wheat Stripe Rust, Mike Pace, Clark Israelsen, Kent Evans, James Barnhill Jan 2008

Wheat Stripe Rust, Mike Pace, Clark Israelsen, Kent Evans, James Barnhill

All Current Publications

Stripe rust, or yellow rust, is primarily a foliar fungal disease of wheat, although it can infect spike and stem tissues. If the pathogen infects the spike (head) it causes extensive quality and grain yield loss. The disease is caused by the fungus Puccinia striiformis f. sp. tritici. The fungus can only survive and reproduce on wheat. It survives from one season to the next on volunteer plants.

Go to article

Alfalfa Stem Nematode, Kent Evans, Clark Israelsen, Mike Pace Jan 2008

Alfalfa Stem Nematode, Kent Evans, Clark Israelsen, Mike Pace

All Current Publications

Alfalfa Stem Nematode (ASN) is a nearly microscopic round worm that enters the alfalfa plant and lives in the stems and leaves, usually above ground. Under ideal conditions (wet weather in late winter or early spring, at 59-70°F), ASN can complete its life cycle from egg to reproducing adult in 19-23 days.

Go to article

Black Grass Bugs, Erin W. Hodgson Jan 2008

Black Grass Bugs, Erin W. Hodgson

All Current Publications

Black grass bugs are common insects in native and introduced range grasses. These insects belong to a large and diverse family of true bugs (Hemiptera: Miridae). Many species of black grass bugs occur in the United States, including 23 Irbisia spp. and 8 Labops spp. The most common species in Utah include I. pacifica and L. hesperius. Both types of black grass bugs can have adults with fully formed wings, but shortwinged forms are also naturally occurring.

Go to article

Neochetina Species And Arthropod Communities In Water-Hyacinth Rafts In South Carolina, Benjamin Powell Dec 2007

Neochetina Species And Arthropod Communities In Water-Hyacinth Rafts In South Carolina, Benjamin Powell

All Theses

Arthropod communities inhabiting feral water-hyacinth rafts were surveyed monthly in South Carolina's Coastal Plain from March 2005 through February 2006. Special attention was given to the chevroned waterhyacinth weevil [Neochetina bruchi (Hustache)], the mottled waterhyacinth weevil [N. eichhorniae (Warner)] (both Coleoptera: Curculionidae), and the waterhyacinth moth [Niphograpta albiguttalis (Warren)] (Lepidoptera: Crambidae), which were imported into North America to control water-hyacinth. Communities of arthropods are compared among sites, flow regimes (lentic, lotic, and tidal), and months of the year. The arthropod communities in waterhyacinth rafts in South Carolina are more diverse than previously reported. Rafts in each of …

Go to article

Phylogeny And Classification Of Hydropsychidae Subfamilies And Genera Of The World (Insecta: Trichoptera), Christy Geraci Dec 2007

Phylogeny And Classification Of Hydropsychidae Subfamilies And Genera Of The World (Insecta: Trichoptera), Christy Geraci

All Dissertations

The family Hydropsychidae is nearly ubiquitous in streams and rivers, with over 1600 described species worldwide. Hydropsychidae is ecologically important and its larvae play key roles as indicators of water quality. Conflicting morphological characters have obscured the evolutionary history of the subfamilies, and the wide diversity of phallic morphology among Hydropsyche sensu lato species has created unstable classification systems that have been disputed among authors. My research used five nuclear ribosomal and mitochondrial COI fragments to infer a molecular phylogeny for Hydropsychidae subfamilies and genera, focusing particularly on the Hydropsychinae and the Hydropsyche sensu lato lineage. The monophyly of four …

Go to article

First Prev Next Last