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Articles 121 - 150 of 188
Full-Text Articles in Entomology
Characterization Of The Subcortical Interactions Between Larvae Of The Southern Pine Sawyer Monochamus Titillator (F.) And The Larvae Of The Southern Pine Beetle Guild Using Molecular Gut Analyses, Erich N. Schoeller
LSU Master's Theses
The southern pine beetle guild (Coleoptera: Curculionidae: Scolytinae) is arguably the most destructive group of forest pests in the Southeastern United States. Laboratory assays suggest that larvae of wood borer associates from the genus Monochamus (Coleoptera: Cerambycidae) may be facultative intraguild predators of southern pine beetle guild. In this study the dynamics of the subcortical interactions between M. titillator (F.) and members of the southern pine beetle guild were examined using PCR-based molecular gut content analyses. Species-specific PCR primer sets were developed to work under multiplex PCR conditions to detect DNA of members of southern pine beetle guild in the …
A Study Of Horn Fly, Haematobia Irritans (L.) (Diptera: Muscidae), Target-Site Sensitivity, Susceptibility, And Resistance Management At Selected Sites In Louisiana, Cole David Younger
A Study Of Horn Fly, Haematobia Irritans (L.) (Diptera: Muscidae), Target-Site Sensitivity, Susceptibility, And Resistance Management At Selected Sites In Louisiana, Cole David Younger
LSU Doctoral Dissertations
The purpose of the first study was to evaluate the effectiveness of the use of a mid-season avermectin pour-on to cattle for managing OP resistance in horn fly populations at the Rosepine Louisiana Agricultural Research Station. During an eight year study, ivermectin treatments were made three times (when the treatment threshold of less than five weeks of control was reached), and in the following years, the number of weeks of control increased to 9 to 10 weeks each time. The purpose of the second study was to test a two-year OP/one-year pyrethroid rotation strategy as a strategy for maintaining susceptibility …
Introduction And Establishment Of Cyrtobagous Salviniae Calder And Sands (Coleoptera: Curculionidae) For The Control Of Salvinia Minima Baker (Salviniaceae), And Interspecies Interactions Possibly Limiting Successful Control In Louisiana, Katherine A. Parys
LSU Doctoral Dissertations
Common salvinia, Salvinia minima Baker, is a floating aquatic invasive macrophyte that obstructs waterways and causes problems in wetlands across Louisiana and Texas. The salvinia weevil, Cyrtobagous salviniae Calder and Sands, has been released in over 14 countries around the world for the biological control of Salvinia spp. We successfully monitored the introduction and establishment of C. salviniae on S. minima in southern Louisiana between 2006 and 2010. Cyrtobagous salviniae significantly lowered the biomass of S. minima and increased the number of terminal buds damaged but had no significant impact on pH, dissolved oxygen, conductivity, surface temperature, percent of surface …
Contribution Of Bacillus Thuringiensis Cotton Cultivars And Insecticides To A Fall Armyworm, Spodoptera Frugiperda (J. E. Smith), (Lepidoptera : Noctuidae) Management Strategy, Jarrod T. Hardke
LSU Doctoral Dissertations
Fall armyworm, Spodoptera frugiperda (J. E. Smith), response to cottons, Gossypium hirsutum L., expressing Bacillus thuringiensis (Bt) insecticidal proteins, Cry1Ac (Bollgard®), Cry1Ac + Cry2Ab (Bollgard II®), and Cry1Ac + Cry1F (WideStrike™), was evaluated in field and laboratory experiments. In field trials, larvae that were infested on selected fruiting forms (squares, white flowers, and bolls) of WideStrike™ plants had lower survivorship and caused less injury than larvae on non-Bt plants, regardless of fruiting structures. Bollgard® and Bollgard II® plants produced no consistent negative effects on fall armyworm survivorship and injury. In no-choice laboratory assays, Bollgard II® and WideStrike™ cotton tissue reduced …
Role Of Substrate Moisture, Relative Humidity And Temperature On Survival And Foraging Behavior Of Formosan Subterranean Termites, Bal Krishna Gautam
Role Of Substrate Moisture, Relative Humidity And Temperature On Survival And Foraging Behavior Of Formosan Subterranean Termites, Bal Krishna Gautam
LSU Doctoral Dissertations
The Formosan subterranean termite is an important structural pest in the southern United States, especially Louisiana. Baiting systems and spot treatment with non-repellent delayed action termiticides are among the most eco-friendly control approaches. However, to achieve a desired success from these approaches requires a sophisticated knowledge of foraging behavior and food transfer system of these social insects. Moisture and temperature play a vital role in influencing the foraging behavior of these desiccation prone insects. A series of laboratory experiments were conducted to understand the subtleties of foraging behavior of Coptotermes formosanus Shiraki in relation to moisture, relative humidity and temperature. …
Molecular Mechanisms Of Bacillus Thuringiensis Resistance In The Sugarcane Borer, Yunlong Yang
Molecular Mechanisms Of Bacillus Thuringiensis Resistance In The Sugarcane Borer, Yunlong Yang
LSU Doctoral Dissertations
The sugarcane borer, Diatraea saccharalis, is a major target pest of transgenic corn expressing Bacillus thuringiensis (Bt) proteins in many areas of the U.S. mid-southern region. A Cry1Ab-resistant (Cry1Ab-RR) strain of D. saccharalis has been developed from a single two-parent family-line. To examine the molecular mechanisms of the Cry1Ab resistance in this insect strain, cDNAs of five types of potential candidate genes related to Bt resistance were sequenced using reverse transcriptase polymerase chain reaction (RT-PCR) and 5’ rapid amplification of cDNA end (5’ RACE). The Bt resistance candidate genes examined included three trypsins (DsTRYs), three chymotrypsins (DsCHYs), three aminopeptidases N …
Quantifying Tarnished Plant Bug, Lygus Lineolaris (Palisot De Beauvois), Resistance To Acephate In Louisiana, Josh T. Copes
Quantifying Tarnished Plant Bug, Lygus Lineolaris (Palisot De Beauvois), Resistance To Acephate In Louisiana, Josh T. Copes
LSU Master's Theses
The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is one of the most yield- limiting insect pests attacking cotton in the Mid-Southern region of the U.S. This pest is almost exclusively managed with chemical control strategies. The organophosphate insecticide, acephate, has been one of the most important insecticides recommended to control tarnished plant bugs. In recent years, reports of unsatisfactory acephate performance have become common and actual field rates have been increased to improve control. The objective of this study was to survey acephate susceptibility in Louisiana populations of tarnished plant bug using laboratory bioassays and evaluate acephate efficacy …
Association Of Esterases In Resistance To Naled And Resmethrin In The Southern House Mosquito, Culex Quinquefasciatus, Jennifer R. Gordon
Association Of Esterases In Resistance To Naled And Resmethrin In The Southern House Mosquito, Culex Quinquefasciatus, Jennifer R. Gordon
LSU Master's Theses
The vector-competency and its affinity for humans make C. quinquefasciatus an important target of mosquito abatement programs. Whenever such control programs are implemented, protocols to monitor frequencies and mechanisms of resistance to the insecticides used are necessary to optimize the efficacy of the management strategy and to slow development of resistance to the insecticides used. In the current study, susceptibilities to the two adulticides used by EBRMARC (naled and resmethrin) were monitored using field-collected mosquitoes and a topical and contact bioassay, respectively. My hypothesis was that esterase-mediated enhanced metabolism conferred resistance to both insecticides in populations of C. quinquefasciatus from …
Toxicity Interaction Of Fipronil And Imidacloprid Against Coptotermes Formasanus, Pan Luo
Toxicity Interaction Of Fipronil And Imidacloprid Against Coptotermes Formasanus, Pan Luo
LSU Master's Theses
The Formosan subterranean termite, Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae), is considered one of the most destructive structural pests in the world, especially in warm and humid areas. Insecticide application is an effective strategy in termite control. In recent years, non-repellent insecticides have become popular for their high efficacy due to delayed toxicity and horizontal transfer. Fipronil (registered name Termidor®) and imidacloprid (registered name Premise®) have been applied to the perimeter of millions of houses in the United States. Fipronil and imidacloprid have different modes of action which may produce a synergistic effect when combined. There have been no studies on …
Survivorship, Tunneling And Feeding Behaviors Of Formosan Subterranean Termite (Isoptera: Rhinotermitidae) In Response To Trans-Caryophyllene, Qiaoling Qi
LSU Master's Theses
The Formosan subterranean termite, Coptotermes formosanus Shiraki, an invasive species from southern China, is one of the most destructive wood pests in the United States. Presently, termites are managed through chemical control. However, some synthetic chemicals cause serious environmental problems due to their persistence and toxicity. There is growing interest in using natural compounds with low toxicity to mammals to control termites. Trans-caryophyllene is a component of essential oil found in many flowering plants. It is especially abundant in clove oil. It has also been found to be released from the roots of maize damaged by insects. I investigated caryophyllene …
Categorization And Indentification Of Mechanisms Of Sugarcane Resistance To The Sugarcane Aphid (Hemiptera: Aphididae), Waseem Akbar
Categorization And Indentification Of Mechanisms Of Sugarcane Resistance To The Sugarcane Aphid (Hemiptera: Aphididae), Waseem Akbar
LSU Doctoral Dissertations
Sugarcane in Louisiana is colonized and sometimes heavily infested by two aphid species, the sugarcane aphid, Melanaphis sacchari (Zehntner), and the yellow sugarcane aphid,Sipha flava(Forbes). Melanaphis sacchari, the main vector of sugarcane yellow leaf virus, is distributed throughout Louisiana’s sugarcane-growing regions. Five cultivars representing 90% of the commercial acreage in Louisiana (LCP 85-384, HoCP 91-555, Ho 95-988, HoCP 96-540,L 97-128) were evaluated for resistance to aphids in the greenhouse. Antibiosis was the primary category of resistance to both aphid species. Based on the intrinsic rate of natural increase, L 97-128 and HoCP 91-555 were comparatively susceptible and resistant cultivars, respectively. …
Effects Of Acephate On The Distribution Of Tarnished Plant Bugs Within The Cotton Plant Profile, Kyle Andrew Fontenot
Effects Of Acephate On The Distribution Of Tarnished Plant Bugs Within The Cotton Plant Profile, Kyle Andrew Fontenot
LSU Master's Theses
The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is a primary pest of cotton in the mid-southern United States. Chemical control strategies are the primary integrated pest management tool used to manage this pest in cotton. A better understanding of tarnished plant bug behavior and distribution on cotton plants is needed to improve the scouting and monitoring protocols used to estimate population and crop injury levels needed to initiate treatments. This pest frequently re-infests fields after insecticide treatments. Sampling protocols should consider the sub-lethal effects of insecticides on migrating populations or on survivors that remain on insecticide-treated plants. Studies …
Resistance To Bacillus Thuringiensis In Sugarcane Borer, Diatraea Saccharalis (F.), Xiaoyi Wu
Resistance To Bacillus Thuringiensis In Sugarcane Borer, Diatraea Saccharalis (F.), Xiaoyi Wu
LSU Doctoral Dissertations
The sugarcane borer, Diatraea saccharalis (F.), is a dominant corn stack boring pest and a major target of Bacillus thuringiensis (Bt)-corn in many areas of the mid-southern region of the United States. A Cry1Ab-resistant strain of D. saccharalis, capable of survival on commercial Bt corn plants, was established using an F2 screening procedure. Larval survival of Cry1Ab-resistant, -susceptible, and -heterozygous genotypes was evaluated on five non-Bt and seven Bt field corn hybrids at two plant stages. During the vegetative stages, all seven Bt corn hybrids were highly efficacious against the three genotypes, while 8-18% of the heterozygous genotype survived on …
The Integration Of Mosquito Avian Host Preference With West Nile Virus Activity In Wild Bird And Mosquito Populations In Baton Rouge, Louisiana, Jessica Erin Brauch
The Integration Of Mosquito Avian Host Preference With West Nile Virus Activity In Wild Bird And Mosquito Populations In Baton Rouge, Louisiana, Jessica Erin Brauch
LSU Master's Theses
West Nile virus (WNV) infection rates in wild birds and mosquitoes, and the blood-feeding patterns of mosquitoes were examined at two study sites in Baton Rouge, Louisiana to identify the potential avian reservoir hosts and mosquito vectors of West Nile virus (WNV). Blood samples from a total of 2,442 wild birds in the orders Passeriformes, Piciformes and Columbiformes were collected from May 2006 to April 2008 and tested for the presence of WNV RNA using RT-PCR and antibodies to WNV using an epitope-blocking ELISA. WNV was detected in 3.77% of wild bird blood samples and antibodies to WNV were detected …
Succession Of Coleoptera On Freshly Killed Loblolly Pine (Pinus Taeda L.) And Southern Red Oak (Quercus Falcata Michaux) In Louisiana, Stephanie Gil
Succession Of Coleoptera On Freshly Killed Loblolly Pine (Pinus Taeda L.) And Southern Red Oak (Quercus Falcata Michaux) In Louisiana, Stephanie Gil
LSU Master's Theses
Wood is important in forest ecology because its large biomass serves as a nutritional substrate and habitat for many organisms, including Coleoptera, and beetles contribute greatly to nutrient recycling in forests. Overlapping complexes of beetles invade dead wood according to the species of tree, ambient conditions, and most importantly, stage of decomposition. Beetle succession was studied in loblolly pines (Pinus taeda L.) and southern red oaks (Quercus falcata Michx.) by documenting beetle arrival and residency in cut, reassembled, and standing bolts. Twelve trees of each species at Feliciana Preserve in West Feliciana parish, LA were felled during October 2004 and …
Characterizing The Epidemiology Of Bluetongue Virus Serotype One In South Louisiana, Michael Edward Becker
Characterizing The Epidemiology Of Bluetongue Virus Serotype One In South Louisiana, Michael Edward Becker
LSU Master's Theses
In November 2004, bluetongue virus (BTV) serotype 1 was detected for the first time in the U.S. from a hunter-killed deer in the marsh area of the Atchafalaya Delta in St. Mary Parish, LA. Subsequent serum surveys of three cattle farms further inland from the area where the deer was shot found bluetongue virus serotype 1 positive cattle on two of the three farms. The purpose of this study was to determine potential BTV vectors in the area where BTV-1 positive animals were detected and compare different trapping techniques for capturing specimens of the genus Culicoides. The study was conducted …
Factors Potentially Influencing The Abundance Of Mosquitoes In Louisiana Rice Fields, Ana Maria Sanchez De Cuadra
Factors Potentially Influencing The Abundance Of Mosquitoes In Louisiana Rice Fields, Ana Maria Sanchez De Cuadra
LSU Master's Theses
The rice stink bug (Oebalus pugnax) is the major pest of late-season rice in Louisiana. Prior studies indicate that large populations of mosquitoes are often present in rice fields during the time that rice fields are infested with rice stink bugs. Lambda-cyhalothrin (Karate®) is widely used to control rice stink bugs. The purpose of this study was to determine if application of the insecticide Karate® at a rate of 0.033 kg/ha, for rice stink bug control had an effect on the population of mosquitoes in rice fields. This effect was assessed by monitoring natural populations of mosquitoes before and after …
Survival, Growth, And Behavior Of Helicoverpa Zea (Boddie) And Heliothis Virescens (F.) (Lepidoptera: Noctuidae) On Genetically Engineered Cotton Expressing The Vip3a Insecticidal Protein, Padma Latha Bommireddy
Survival, Growth, And Behavior Of Helicoverpa Zea (Boddie) And Heliothis Virescens (F.) (Lepidoptera: Noctuidae) On Genetically Engineered Cotton Expressing The Vip3a Insecticidal Protein, Padma Latha Bommireddy
LSU Doctoral Dissertations
Larval behavior, survivorship, and injury potential of Helicoverpa zea (Boddie), and tobacco budworm, Heliothis virescens (F.), was evaluated on cotton plants genetically engineered to express Bacillus thuringiensis (Bt) insecticidal proteins, Vip3A and Vip3A +Cry 1Ab (VipCot™). Larvae (2-d-old) of both species were infested on plant terminals of vegetative or flowering stage cotton plants. Regardless of species, more larvae migrated from the plant terminals of Vip3A and VipCot plants compared to larvae infested on a conventional non-Bt cotton line (Coker 312). Larval (2-d-old) survivorship on VipCot™ plant structures was generally lower than that on similar structures of the Vip3A cotton line. …
Novel Methods For The Control Of Phlebotomine Sand Flies (Diptera: Psychodidae), Thomas Michael Mascari
Novel Methods For The Control Of Phlebotomine Sand Flies (Diptera: Psychodidae), Thomas Michael Mascari
LSU Doctoral Dissertations
In arid and semi-arid parts of the Old World, Phlebotomus paptasi is a significant biting pest of man and is the primary vector of Leishmania major, the causative agent of zoonotic cutaneous leishmaniasis (ZCL). Phlebotomus papatasi exhibits a close association with the burrowing rodents that serve as the reservoirs of L. major. Rodent burrows are considered to be the primary habitat of immature P. papatasi in ZCL foci, and sand fly larvae have been observed feeding on rodent feces. In laboratory studies, five insecticides (diflubenzuron, novaluron, methoprene, pyriproxyfen, or ivermectin) were incorporated into the diet of Syrian hamsters and evaluated …
Detection Of West Nile Virus Activity In Male And Female Mosquitoes, And Evaluation Of Host-Utilization Patterns Of Mosquitoes, In East Baton Rouge Parish, Louisiana, Andrew James Mackay
Detection Of West Nile Virus Activity In Male And Female Mosquitoes, And Evaluation Of Host-Utilization Patterns Of Mosquitoes, In East Baton Rouge Parish, Louisiana, Andrew James Mackay
LSU Doctoral Dissertations
ABSTRACT Host utilization patterns of female mosquitoes, and WNV infection rates in male and female mosquitoes, were examined in East Baton Rouge Parish to identify potential vectors of West Nile virus (WNV). A total of 244,374 female mosquitoes were collected between November 2002 and October 2004 and tested by viral isolation. Additionally, 131,896 female mosquitoes were tested by VecTest in 2003, and 167,175 female mosquitoes were tested by RT-PCR in 2004. West Nile virus was isolated from 17 of 36 mosquito species assayed by virus isolation, WNV antigens were detected in 9 of 27 species tested by VecTest, and WNV …
Chemical Ecology, Fungal Interactions And Forest Stand Correlations Of The Exotic Asian Ambrosia Beetle, Xylosandrus Crassiusculus (Motschulsky) (Curculionidae), Eric Paul Ott
LSU Master's Theses
Increasing evidence of non-indigenous ambrosia beetles aggressively attacking hosts in their new environment in the United States has led to concern over the potential for damage to urban trees, nurseries, orchards, and forests. A novel technique of flooding host trees was devised to stimulate ambrosia beetle attacks, with ambrosia beetle attraction peaking four days following flooding. In-situ sampling identified significant differences in the composition, quantity and point of release (leaf or bole) of volatiles emitted by the flooded and non-flooded trees. Coupled gas chromatography electroantennographic detection revealed olfactory sensitivity by the ambrosia beetle Xylosandrus crassiusculus (Motschulsky) to 29 of these …
Impact And Interaction Of Samea Multiplicalis (Lepidoptera: Pyralidae) And Cyrtobagous Salviniae (Coleoptera: Curculionidae) On Salvinia Minima In South Louisiana And The Foraging Behavior Of Solenopsis Invicta (Hymenoptera: Formicidae) On Salvinia Minima, Sunil Tewari
LSU Master's Theses
A field study was conducted in 2005 and 2006 to evaluate the impact and interaction of the herbivores Cyrtobagous salviniae Calder and Sands and Samea multiplicalis Guenee on common salvinia, Salvinia minima Baker in south Louisiana. It was a completely randomized experimental design in which treatments consisted of C. salviniae and S. multiplicalis feeding on common salvinia both independently and together along with a control. Our study revealed that treatments consisting of C. salviniae and S .multiplicalis feeding both independently and together had a significant impact on the biomass of common salvinia. Sampling done in October of both 2005 and …
Evaluating Precision Agricultural Technologies In A Louisiana Cotton Insect Pest Management System, Joshua Heath Temple
Evaluating Precision Agricultural Technologies In A Louisiana Cotton Insect Pest Management System, Joshua Heath Temple
LSU Master's Theses
A variable rate pesticide application system was developed and tested during 2001 for an agricultural aircraft in Louisiana. Using technology available to the agricultural aviation industry, a variable rate prescription of insecticide was successfully applied to a cotton field in 2002. These studies compared the efficacy and value of spatially variable insecticide (SVI) applications based on yield maps to the producer standard, whole-field broadcast treatments. Insecticide prescriptions were created from historical yield and production data. Treatments included whole-field broadcast sprays, yield-based SVI sprays, and profit-based SVI sprays. Twenty-two SVI applications were made to test fields from 2002-2005 using two aircraft …
Effect Of Red Imported Fire Ant (Solenopsis Invicta Buren) On The Nesting Success Of Northern Bobwhite (Colinus Virginianus L.), Michael Andrew Seymour
Effect Of Red Imported Fire Ant (Solenopsis Invicta Buren) On The Nesting Success Of Northern Bobwhite (Colinus Virginianus L.), Michael Andrew Seymour
LSU Master's Theses
The Northern Bobwhite (Colinus virginianus L.) has experienced average yearly decline of 3% in the United States from 1966-2005. Factors implicated in decline include habitat destruction, alteration of farm practices, and red imported fire ant (RIFA) (Solenopsis invicta Buren). Effect of RIFA on bobwhites has been a hot topic leading to formation of polarized camps – those who believe RIFA have little effect and those who believe the effect will further threaten the species’ survival. The main objective of this study was to determine if RIFA affect nesting of bobwhites and at what stage in nesting birds are most vulnerable. …
Culture-Independent Identification Of Gut Bacteria In Fourth-Instar Red Imported Fire Ant, Solenopsis Invicta Buren, Larvae, Albert Hon-Yu Lee
Culture-Independent Identification Of Gut Bacteria In Fourth-Instar Red Imported Fire Ant, Solenopsis Invicta Buren, Larvae, Albert Hon-Yu Lee
LSU Doctoral Dissertations
Red imported fire ants (RIFA), Solenopsis invicta Buren, are medical, urban, and agricultural pests from South America. Fourth-instar larvae are used by the colony to digest solid food and then regurgitate it for consumption by workers and queens. Larvae are an ideal source of investigations of obligate endosymbiotic bacteria possibly involved in nutrient distributions. I attempted to first identify what bacteria species are in the guts of larvae followed by antibiotic and microscopy work to further study their roles in the ants. The composition of the bacterial community in fire ant larvae was described with culture-independent methods utilizing 16S rDNA …
Detection Of The Bloodmeal Origin Of Mosquitoes Collected At Alligator Farms, And West Nile Virus Activity In Mosquitoes Collected From Alligator Farms, Sentinel Chicken Surveillance Sites, And Larval Habitats, Isik Unlu
LSU Doctoral Dissertations
A three year study was conducted to determine if testing mosquitoes collected in modified sentinel chicken boxes for West Nile Virus (WNV) or testing sentinel chickens for WNV antibody would detect WNV activity prior to reports of human cases in East Baton Rouge (EBR) Parish, Louisiana. In one year we also compared the effectiveness of CDC light traps, gravid traps, and sentinel chicken box traps for collecting WNV positive mosquitoes. In all three years, we detected WNV activity in mosquito collections from sentinel chicken box traps prior to the onset of human cases, while there were no seroconversions in the …
Population Ecology Of Pseudacteon Tricuspis Borgmeier (Diptera: Phoridae), An Introduced Parasitoid Of The Red Imported Fire Ant Solenopsis Invicta Buren (Hymenoptera: Formicidae) In Louisiana, Donald Charles Henne
Population Ecology Of Pseudacteon Tricuspis Borgmeier (Diptera: Phoridae), An Introduced Parasitoid Of The Red Imported Fire Ant Solenopsis Invicta Buren (Hymenoptera: Formicidae) In Louisiana, Donald Charles Henne
LSU Doctoral Dissertations
Aspects of the population ecology of a parasitoid (Pseudacteon tricuspis) of the red imported fire ant (Solenopsis invicta) in Louisiana were studied. The spatio-temporal abundance patterns, dispersal, population spread, aggregation, direct mutual interference and functional response characteristics of this parasitoid were studied to address deficiencies in our knowledge about phorid flies, particularly Pseudacteon parasitoids. This endoparasitoid was discovered to manipulate host ant behavior in ways that benefit its own survival. Laboratory experiments to gain insights into behavioral and functional responses revealed that fly aggregations were density-dependent and interference was not significant when 1-3 females were simultaneously confined with hosts, although …
Biology And Chemical Ecology Of The Sugarcane Beetle And Integrated Pest Management Of Sweet Potato Soil Insects In Louisiana, Tara Parker Smith
Biology And Chemical Ecology Of The Sugarcane Beetle And Integrated Pest Management Of Sweet Potato Soil Insects In Louisiana, Tara Parker Smith
LSU Doctoral Dissertations
Host plant preference and chemical ecology of the sugarcane beetle, Euetheola humilis were evaluated in greenhouse and laboratory studies. Sweet potato, Ipomoea batatas, was significantly preferred over all other plant species evaluated in a host plant preference test. Corn, Zea mays, and sugarcane, Saccharum spp., were the next most chosen plant species in the study. In olfactometer experiments, sugarcane beetles responded significantly more to beetle injured and mechanically injured roots vs. uninjured roots. Male and female beetles were also significantly more attracted to female conspecifics. Differences were not detected between sweet potato cultivars in olfactometer trials. Cultivar preference studies suggested …
Interactions Between Formosan Subterranean Termites, Brown Rot Fungus (Gloeophyllum Trabeum) And Some Of The Fungi Present On The Termite Integument And Gut, Poornima Jayasimha
Interactions Between Formosan Subterranean Termites, Brown Rot Fungus (Gloeophyllum Trabeum) And Some Of The Fungi Present On The Termite Integument And Gut, Poornima Jayasimha
LSU Master's Theses
Although the brown rot fungus, Gloeophyllum trabeum (Pers.:Fr.) Murrill, has been shown to be attractive and beneficial to subterranean termites, including Coptotermes formosanus Shiraki, to date no research has been conducted to determine if the association is mutualistic. We first set out to determine if the fungus could be spread by termites. This would represent an obvious benefit to the fungus. We found that C. formosanus does not spread G. trabeum. Unexpectedly, Formosan subterranean termites were found to suppress the growth of G. trabeum. To further investigate this finding, Formosan subterranean termite workers were released into Petri dishes with wood …
Effect Of Light Intensity And Weld Thickness On The Performance Of Uv-Cured Frp Composite Joints, Jerry Alan Peck
Effect Of Light Intensity And Weld Thickness On The Performance Of Uv-Cured Frp Composite Joints, Jerry Alan Peck
LSU Master's Theses
Thirty-six FRP composite welds were wetted with UV curing vinyl ester resin and used to join fiberglass tubes. The effects of UV light intensity and weld thickness on performance (as measured by bursting pressure and stiffness) were evaluated to determine optimal conditions for joint construction. The joined composite pipes were cured vertically with UV lamps at three different light intensities, 80 mW/cm2, 35 mW/cm2 and 15 mW/cm2 to isolate the effect of UV light intensity. Eight-layer, five-layer and three-layer joints were prepared and cured at constant light intensity to evaluate the effect of reducing the thickness of the composite joint. …