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Plant Sciences

Missouri State University

Theses/Dissertations

Hemocytes

Publication Year

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Effects Of Lemongrass Essential Oil On Galleria Mellonella Hemocytes, Kyndra Chastain Jan 2022

Effects Of Lemongrass Essential Oil On Galleria Mellonella Hemocytes, Kyndra Chastain

MSU Graduate Theses

In modern agriculture, the use of pesticides is unavoidable. However, improper use has resulted in pest resistance and negative impacts on the environment and human health. Changes are needed in the agricultural industry to account for the damage already caused. Researchers have turned to essential oils as key ingredients for potential biopesticides, with some mixtures already on the market. Most studies involving essential oils and a pest’s response concentrate on mortality or interruptions in development during and between life stages. My study, however, focused on immune responses; specifically, lemongrass essential oil’s impact on Galleria mellonella. Such responses include a …


Effects Of "Lemongrass Factor" On Galleria Mellonella Hemocytes, Jennifer C. Rice Dec 2021

Effects Of "Lemongrass Factor" On Galleria Mellonella Hemocytes, Jennifer C. Rice

MSU Graduate Theses

The use of conventional chemical insecticides to control agricultural pest has become problematic as they may have a negative impact towards human health and the environment, resulting in a need to research alternative methods to insect pest control. Plant derived substances like essential oils have been used for generations as toxicants, repellants, and anti-feedants to control agricultural pest. More research is needed to understand how insect immune systems react to essential oils and if cellular immune responses of phagocytosis, encapsulation, and nodulation can be inhibited by such. Subjecting Galleria mellonella to various concentrations of “lemongrass factor” lets the researcher/scientist know …


Impairing The Insect Immune System With Plant-Derived Substances, Katherine Haszcz May 2016

Impairing The Insect Immune System With Plant-Derived Substances, Katherine Haszcz

MSU Graduate Theses

Worldwide resistance to current insecticides continues to grow at an alarming rate, with the danger of pesticide overuse reducing acceptable doses. Alternative strategies for insect pest management are therefore imperative. By compromising the insect immune system with plant-derived substances and studying the detailed processes involved in hemocyte-mediated responses, one can develop improved methods for insect control. Hemocyte numbers change in response to stress. This allows essential defense mechanisms such as phagocytosis and encapsulation to take place. In this thesis, plant-derived substances were used to challenge larval-stage Galleria mellonella (Family: Lepidoptera) due to their nontoxic nature and high value in pest …