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Full-Text Articles in Life Sciences

Ecological, Physiological, And Molecular Characterization Of Annual Bluegrass (Poa Annua L.) Herbicide Resistance And Its Control On Golf Courses, Robert Cross Dec 2014

Ecological, Physiological, And Molecular Characterization Of Annual Bluegrass (Poa Annua L.) Herbicide Resistance And Its Control On Golf Courses, Robert Cross

All Dissertations

Annual bluegrass (Poa annua L.) is one of the most pervasive, adaptable, and variable plant species in the world and is the most problematic winter annual weed in managed turfgrass. Its prolific seedhead production regardless of mowing height, clumping growth habit, and lack of tolerance to stress reduces turfgrass aesthetic quality and playability on golf courses. Its ability to germinate almost year-round influences cultural practices and herbicide use. Herbicides are an integral part of a weed control program for all weeds that invade a desirable turfgrass stand. However, inappropriate use of herbicides results in herbicide resistance issues. In recent years ...


Spatial Distribution And Genetic Variability Of Reniform And Lance Nematodes In Cotton Agroecosystems, Claudia Holguin Dec 2014

Spatial Distribution And Genetic Variability Of Reniform And Lance Nematodes In Cotton Agroecosystems, Claudia Holguin

All Dissertations

Rotylenchulus reniformis (reniform nematode) and Hoplolaimus columbus (Columbia lance nematode) are two of the main plant-pathogenic nematode species affecting cotton production in the United States. For the selection and implementation of effective management practices it is important to understand distribution patterns and population genetic structure of these two nematodes in cotton agroecosystems. In a three-year field study, the spatial distribution of reniform nematode was characterized in two commercial fields in South Carolina to determine the effects of relations with soil texture and crop rotation on reniform nematode distribution (Chapter 1). Results of this project suggest that population densities of reniform ...


An Almost Ideal Demand System Analysis Of Orange And Grapefruit Beverage Consumption In The United States, Catrice Taylor Dec 2014

An Almost Ideal Demand System Analysis Of Orange And Grapefruit Beverage Consumption In The United States, Catrice Taylor

All Theses

This thesis estimates a demand system for natural fruit juices and flavored citrus drinks. Consumption and price data from the Florida Department of Citrus is used to estimate a Linear Approximate Almost Ideal Demand System for natural fruit and fruit juice drink elasticities. The monthly data covers the period from October 2004 to June 2014. Elasticities show orange juice does not have a substitute among the other beverages. 100% orange juice and grapefruit juice are compliments, although other studies have found them to be substitutes.


Application Of Modern Statistical Tools To Solving Contemporary Economic Problems: Evaluation Of The Regional Agricultural Campaign Impact And The Usda Forecasting Efforts, Ran Xie Aug 2014

Application Of Modern Statistical Tools To Solving Contemporary Economic Problems: Evaluation Of The Regional Agricultural Campaign Impact And The Usda Forecasting Efforts, Ran Xie

All Dissertations

The research is comprised with three studies to implement statistical tools for examining two economic issues: the impact of a regional agricultural campaign on participating restaurants and efforts of U.S. Department of Agriculture (USDA) forecasting reports in agricultural commodity markets. The first study examined how various components of the Certified South Carolina campaign are valued by participating restaurants. A choice experiment was conducted to estimate the average willingness to pay (WTP) for each campaign component using a mixed logit model. Three existing campaign components--Labeling, Multimedia Advertising, and the 'Fresh on the Menu' program were found to have a significant ...


Evaluation Of 2,4-D And Dicamba Based Herbicide Programs For Weed Control In Tolerant Soybean, Dwayne Joseph Aug 2014

Evaluation Of 2,4-D And Dicamba Based Herbicide Programs For Weed Control In Tolerant Soybean, Dwayne Joseph

All Theses

Weeds are the most limiting factor on soybean yields in South Carolina. With their early emergence and rapid growth, weeds compete with crops for resources. The recent evolution of herbicide resistant weeds has made it increasingly difficult for growers to actively control weeds in fields. Glyphosate and ALS-resistant Palmer amaranth (Amaranthus palmeri S. Watson) biotypes have spread rapidly throughout South Carolina, especially in areas where resistance management isn't practiced. In the near future, soybean varieties will be introduced with tolerance to 2,4-D (Dow AgroSciences) and dicamba (Monsanto Company). Field and greenhouse experiments were conducted at Edisto Research and ...


Chemical Control Of Rootstock Regrowth In Grafted Watermelon And Its Effects On Plant Growth And Development, Shawna Daley May 2014

Chemical Control Of Rootstock Regrowth In Grafted Watermelon And Its Effects On Plant Growth And Development, Shawna Daley

All Theses

High, year-round demand, increased production intensity without crop rotation, and the loss of Methyl Bromide as a soil fumigant, results in unfavorable soil conditions with increased soil pathogen populations for growing watermelon [Citrullus lanatus (Thunb) Matsum and Nakai]. Grafting watermelon onto resistant rootstocks provides successful control of soil-borne pathogens, and could increase yield and fruit quality; however, the high production costs, especially from labor, involved in grafted transplant production, has prevented the adoption of grafted watermelon use in the United States. Much of the labor is required for meristematic regrowth control, which can cause abortion of the scion and competition ...


Phenological Relationships Of Nesting Barn Swallows In A Swallow-Fly-Cattle System And Their Potential Role In Suppression Of Pest Flies In A Warming Climate, Claire Stuyck May 2014

Phenological Relationships Of Nesting Barn Swallows In A Swallow-Fly-Cattle System And Their Potential Role In Suppression Of Pest Flies In A Warming Climate, Claire Stuyck

All Theses

Conservation efforts for birds that provide ecosystem services in agricultural systems require management approaches that cross disciplines. This information is communicated through a variety of outlets but rarely in ways that interface effectively with normal management approaches. The disconnect between agriculture and wildlife conservation reduces the likelihood that ecosystem service benefits will be realized. One understudied ecosystem service provided by birds such as barn swallows (Hirundo rustica) is their role in suppression of flies that are pests to livestock. Climate change, however, may differentially affect flies that respond largely to temperature, and swallows that migrate and respond to photoperiod and ...


An Examination Of The Feasiblity Of A Food Hub For The Pee Dee Region, Emily Purcell May 2014

An Examination Of The Feasiblity Of A Food Hub For The Pee Dee Region, Emily Purcell

All Theses

Horry County, the home of Myrtle Beach, South Carolina, attracts a large level of spending by visitors who are helping to fuel growing demand for locally produced food. Regional growers are interested in meeting this demand but are limited by retail requirements with respect to lot size, timing, and quality (including food safety aspects such as Good Agricultural Practices (GAP) certification). A number of communities have turned to food hubs as a means of aggregating production by local growers and providing appropriate marketing functions, such as storage and meeting standards. Hence, food hubs can fill a gap between producers and ...


Water For Electricity In The Upper Savannah Basin: Impacts On Freshwater Mussels, Alan Johnson, Snehal Mhatre Apr 2014

Water For Electricity In The Upper Savannah Basin: Impacts On Freshwater Mussels, Alan Johnson, Snehal Mhatre

Graduate Research and Discovery Symposium (GRADS)

The water resources of the Upper Savannah River Basin are subjected to extensive water withdrawals for production of electricity for the region. The use of Savannah River Basin water resources for electricity production and the associated impact on reservoir levels, streamflows, and thermal regimes is in conflict with the requirements of in-stream biota particularly freshwater mussels. The Savannah River Basin contains atleast 26 unionid species, most of which are listed as endangered, threatened, or of special concern at the state level. Populations of these species have experienced significant declines and extirpations in the recent decades. Of these unionid species, brook ...