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Articles 91 - 106 of 106
Full-Text Articles in Entomology
Evaluation Of Selected Refuges In A Bollgard Cotton Production System: Heliothine Movement And Effects On Boll Injury, Rhett Hunter Gable
Evaluation Of Selected Refuges In A Bollgard Cotton Production System: Heliothine Movement And Effects On Boll Injury, Rhett Hunter Gable
LSU Master's Theses
During 2001-2003, distribution of heliothine- (bollworm, Helicoverpa zea [Boddie], and tobacco budworm, Heliothis virescens [F.]) injured bolls in a transgenic Bacillus thuringiensis Berliner (Bt) Bollgard® and non-Bt refuge cotton system was evaluated in several experiments. Heliothine-damaged bolls were significantly higher and seedcotton yields were lower in the non-Bt refuge than in the Bollgard® areas of fields. The highest probability in occurrence of damaged bolls was at sites near the center of the non-Bt refuge. Number of damaged bolls and probability values describing occurrence decreased from the center of the refuge to sites near the interface (adjacent rows) of the non-Bt …
Evaluation Of Vetiver Oil And Alate Biology As Preventative Measures Against The Formosan Subterranean Termite, Coptotermes Formosanus Shiraki (Isoptera: Rhinotermitidae), Karen Elizabeth Nix
Evaluation Of Vetiver Oil And Alate Biology As Preventative Measures Against The Formosan Subterranean Termite, Coptotermes Formosanus Shiraki (Isoptera: Rhinotermitidae), Karen Elizabeth Nix
LSU Master's Theses
The Formosan subterranean termite, Coptotermes formosanus Shiraki, is responsible for over $1 billion in property damage, repairs, and control in the United States. Presently, control of this exotic pest depends mainly on chemical methods. There is an increasing interest in using natural products in pest control because of their low mammalian toxicity and environmental safety. Chemical components of the roots of vetiver grass, Vetiveria zizanioides (L.) Nash, have shown to be effective repellents and toxicants to Formosan subterranean termites. Objectives of this research were to evaluate: 1) vetiver grass root growth and its oil distribution; 2) vetiver oil, nootkatone, and …
Evaluation Of Beauveria Bassiana And Host Plant Resistance For The Management Of Rice Stink Bug In Rice Agro-Ecosystem, Dilipkumar Thakorbhai Patel
Evaluation Of Beauveria Bassiana And Host Plant Resistance For The Management Of Rice Stink Bug In Rice Agro-Ecosystem, Dilipkumar Thakorbhai Patel
LSU Master's Theses
Isolates of Beauveria bassiana (Balsamo) Vuillemin were tested for biological control of rice stink bug, Oebalus pugnax (Fab.), in the laboratory, in small-plot field experiments compared with conventional insecticides, and in a large-plot experiment to determine the spread and persistence of the fungus. The soil-derived isolate LRC28 was more virulent to O. pugnax adults than the rice stink bug-derived isolate RSB in a laboratory experiment. The fungal isolates did not differ from one another in reducing insect numbers or in infecting rice stink bugs in the small-plot experiments. A single application of B. bassiana reduced rice stink bug nymphs on …
Seasonal Abundance And Detection Of West Nile Virus In Ceratopogonids (Diptera: Ceratopogonidae) In East Baton Rouge Parish, Louisiana, Isidra Joselina Sabio
Seasonal Abundance And Detection Of West Nile Virus In Ceratopogonids (Diptera: Ceratopogonidae) In East Baton Rouge Parish, Louisiana, Isidra Joselina Sabio
LSU Master's Theses
The seasonal abundance and species composition of ceratopogonids (Diptera: Ceratopogonidae) in East Baton Rouge parish was described from light trap collections at 15 sites. A total of 4,968 collections were processed, and 48,667 ceratopogonids were collected from 20 November, 2002 through 25 November, 2004. Three genera of ceratopogonids (Forcipomyia Meigen, Atrichopogon Kieffer, and Culicoides Latrielle) and a total of 18 species of the genus Culicoides were identified. Ceratopogonids had distinctive spring and fall population peaks. Ceratopogonids were collected in every month during the study, with the exception of February 2004. These results suggest that certain species of Culicoides may …
Liquid Feeding In The Red Imported Fire Ant, Solenopsis Invicta Buren (Hymenoptera: Formicidae), Kathryn Shea O'Brien
Liquid Feeding In The Red Imported Fire Ant, Solenopsis Invicta Buren (Hymenoptera: Formicidae), Kathryn Shea O'Brien
LSU Master's Theses
In order to accurately test liquid bait effectiveness in the lab, we determined that a starvation time of 96h is more appropriate than 72h of starvation time for laboratory fire ants (Solenopsis invicta Buren) to better simulate foraging ants in the field. Densities and viscosities of two commercial baits and 20% sugar water at 25C were measured then compared to amount of material consumed per ant at these physical properties. Mean densities of 20% sugar water, Dr. Moss, and Terro were 1.051, 1.287, and 1.354 g/mL, respectively, and viscosity of each bait treatment varied in the same order but more …
Bollworm (Lepidoptera: Noctuidae) Production From Alternate Host Crops And Their Contribution To A Non-Bollgard Cotton Refuge, Edward Ashley Peters
Bollworm (Lepidoptera: Noctuidae) Production From Alternate Host Crops And Their Contribution To A Non-Bollgard Cotton Refuge, Edward Ashley Peters
LSU Master's Theses
The bollworm’s, Helicoverpa zea (Boddie), inherent tolerance to the Bacillus thuringiensis toxin expressed in Bollgard® cotton and its ability to exploit numerous hosts has caused the Environmental Protection Agency to re-evalute the refuge component of the resistance management strategy. The goal of this project was to evaluate selected alternate host crops as supplemental non-cotton refuges for bollworm. The relative density, temporal occurrence, and life stage synchrony for bollworm larvae and adults was studied in Bollgard® cotton, Bollgard® cotton non-Bollgard® cotton, field corn, grain sorghum, and soybean. Native populations of bollworm larvae were monitored June to September during 2002 and 2003 …
Insect Pest Management Approaches Among Currently Recommended Sugarcane Varieties In Louisiana, Frederick R. Posey
Insect Pest Management Approaches Among Currently Recommended Sugarcane Varieties In Louisiana, Frederick R. Posey
LSU Master's Theses
The sugarcane borer, Diatraea saccharalis (F.), (Lepidoptera: Crambidae), is responsible for more than 90% of the total insect damage to sugarcane in Louisiana. The decision to apply insecticides is complex and influenced by numerous variables. Included among these variables are insect infestation levels, varieties, weather conditions, production input levels, and environmental concerns. Predicting damage that may result from infestations occurring at a particular time of the crop production season is also important. The objective of this research was to evaluate the impact of these variables on sugarcane borer populations and subsequent yield loss. Results from a two-year survey indicated a …
The Performance Of The Baldcypress Leafroller (Archips Goyerana Kruse, Lepidoptera: Torticidae) In Response To Fertilization, Thinning, And Genetic Variation In Host Baldcypress (Taxodium Distichum L. Richard), Crawford Wood Johnson
LSU Master's Theses
Mississippi River diversions into coastal Louisiana wetlands aim to provide nutrient inputs and slow the impacts resulting from saltwater intrusion. Baldcypress (Taxodium distichum L. Richard) exhibits significant intraspecific tolerance to salinity and is being developed for restoration projects. Two studies were conducted using five half-sibling families of baldcypress planted at two locations in southeast Louisiana to investigate the effects of nutrient additions, thinning, and phenology on the growth of the baldcypress leafroller (Archips goyerana Kruse, BCLR). In the Jeanfreau study, families were subjected to a control, low, and high level of fertilization simulating two-four years’ effects, respectively, from a Mississippi …
Species Diversity And Biogeography Of Ants (Hymenoptera: Formicidae) In Louisiana With Notes On Their Ecology, Shawn T. Dash
Species Diversity And Biogeography Of Ants (Hymenoptera: Formicidae) In Louisiana With Notes On Their Ecology, Shawn T. Dash
LSU Master's Theses
Over three decades have passed since the completion of Moser and Blum's (1960) treatment of the ants of Louisiana. This research represents a significant contribution to and update of their work. I report the first-ever comprehensive assessment of the Louisiana Formicid fauna. More than 100 species from 38 genera and eight subfamilies are covered. This faunistic survey gives valuable data of biodiversity and macro/microhabitat selection of ant species. Included are keys to all subfamilies, genera, and species with illustrations photographs, and a regional map for each species.
Field Evaluation Of Mosquito Control And Repellent Devices In Southern Louisiana, Brett Warren Collier
Field Evaluation Of Mosquito Control And Repellent Devices In Southern Louisiana, Brett Warren Collier
LSU Master's Theses
The effect of 2 mosquito traps and 2 repellent systems upon the catch of an American Biophysics Corporation (ABC) light trap were evaluated over a 14-month period at 3 locations in Louisiana. Devices evaluated included: 1) ABC Mosquito Magnet® with dry ice and octenol, 2) the BioSensory 500 cc Dragonfly® Biting Insect Trap with CO2, octenol, and Mosquito Cognito® which uses Conceal™ inhibitor, 3) the SC Johnson OFF!® Mosquito Lantern, and 4) the ThermaCell® cordless mosquito repellent system for residential use. The number of mosquitoes caught in the ABC light traps at the SC Johnson OFF!® Mosquito Lantern …
Effect Of Cotton Aphids, Aphis Gossypii (Glover), On Cotton Plant Development And Yield Components, Robert Hankins Jones
Effect Of Cotton Aphids, Aphis Gossypii (Glover), On Cotton Plant Development And Yield Components, Robert Hankins Jones
LSU Master's Theses
The effect of cotton aphids, Aphis gossypii (Glover), on cotton plant development and yield was studied during 2000 and 2001. Tests were conducted at the Macon Ridge Station (Winnsboro, Louisiana) in 2000 and 2001, and at the Northeast Research Station (St. Joseph, Louisiana) in 2001. Tests were performed in irrigated and non-irrigated regimes using individual plant comparisons, micro-plots, and whole plots. In both years and at both locations, cotton aphid densities induced chlorosis, and a downward cupping of leaves during the infestation period. The insecticides, pymetrozine and thiamethoxam, were applied to control natural infestations of cotton aphids. Although pymetrozine and …
Bees Associated With Louisiana Longleaf Pine Savannas, Chanda Sara Bartholomew
Bees Associated With Louisiana Longleaf Pine Savannas, Chanda Sara Bartholomew
LSU Master's Theses
Longleaf pine savannas are perhaps the most threatened ecosystems in North America. Despite a well documented and highly diverse flora, little has been published on insects in general and, in particular, on bees that provide the valuable service of plant pollination. Thus, the aims of this study were to: 1) survey bees found in two savanna types in southeastern Louisiana; and 2) contrast the diversity and species composition of these two savanna types. An ancillary goal was to contrast two collecting protocols for bees in the savanna habitat. Overall, a total of 3,407 bees were collected representing 125 species. Of …
Volatiles Associated With Formosan Subterranean Termites And Related Methods Development, Paul Mclaughlin
Volatiles Associated With Formosan Subterranean Termites And Related Methods Development, Paul Mclaughlin
LSU Master's Theses
An investigation was conducted to identify volatiles associated with active Formosan termites. Using a combined technique of short path thermal desorption-gas chromatography/mass spectrometry (SPTD-GC/MS), qualitative comparisons were made between compounds detected in treatments containing active Formosan termites versus those detected in controls without Formosan termites. Except for dimethyl disulfide, none of the compounds were consistently detected in the treatments but not the controls for the four termite groups tested. However, in each of the three groups that dimethyl disulfide was detected, dead termites that were decomposing along with active termites were present. Therefore, none of the compounds could be classified …
Abiotic And Biotic Factors Affecting The Distribution Of Solenopsis Invicta Buren, Brachymyrmex Sp., And Linepithema Humile (Mayr) In East Baton Rouge Parish, Louisiana, Jessica Lynn Rosson
Abiotic And Biotic Factors Affecting The Distribution Of Solenopsis Invicta Buren, Brachymyrmex Sp., And Linepithema Humile (Mayr) In East Baton Rouge Parish, Louisiana, Jessica Lynn Rosson
LSU Master's Theses
Ant populations and their distribution are affected by many circumstances. Abiotic factors such as weather, water availability, and soil characteristics may determine if a habitat is suitable for ants. Other factors such as level of disturbance, available food resources, reproductive biology, and natural enemies also contribute to defining ant distribution. Three ant species in East Baton Rouge parish, Louisiana were studied to determine what factors affected their distribution by measuring abiotic and biotic factors at sampling sites throughout the parish. These factors included weather, water availability, vegetation types, level of disturbance, and soil characteristics. Factors which predict abundance of Solenopsis …
Effects Of Mid-Season Avermectin Treatments Of Cattle On Pyrethroid Resistance In Three Populations Of Horn Flies, Haematobia Irritans Irritans (L.) (Diptera: Muscidae), Glenn R. Oremus
LSU Master's Theses
The effects of mid-season avermectin treatments on pyrethroid-resistant horn fly populations were examined between 1999-2002 at three separate Louisiana State University Agricultural Center research stations; Red River Research Station (Bossier City, LA), Macon Ridge Research Station (Winnsboro, LA) and St. Joseph (St. Joseph, LA). The cattle were treated with pyrethroid ear tags in all years at all farms, and each farm received a mid-season avermectin treatment in one year. With consecutive yearly use of pyrethroids the number of weeks of control decreased for all farms. The number of weeks of control rebounded at Red River from 2 to 13 weeks …
Litter And Ground Dwelling Spiders Of Mixed Mesophytic Forest In Southeast Louisiana, Joyce Fassbender
Litter And Ground Dwelling Spiders Of Mixed Mesophytic Forest In Southeast Louisiana, Joyce Fassbender
LSU Master's Theses
During Pleistocene glaciation much of the southeastern United States was covered with mixed mesophytic hardwood forest. These forests are composed predominantly of magnolia, holly, and beech with a mixture of other tree species, such as oak and hickory, and a distinct understory. Remnants of mixed mesophytic hardwood forests occur in the southern United States and are important refugia for disjunct and habitat-restricted species. In Louisiana, the mixed mesophytic forest habitat is found mostly in West Feliciana Parish, particularly in the area around St. Francisville. I chose two sites to conduct a study of spider diversity in litter habitats of disturbed …