Search Results

1. Chan, Wenyaw Optimal policies directed at reducing pest damages for a pestpredator model /

Doctor of Philosophy, The Ohio State University, 1984, Graduate School

Committee: Not Provided (Other) Subjects: Statistics

2. Moser, John A preliminary study on the gall makers of hackberry with a description of a new parasite, Torymus vesiculus N. Sp. (Hymenoptera: Torymidae) /

Master of Science, The Ohio State University, 1954, Graduate School

Committee: Not Provided (Other) Subjects:

3. Kohli, Megan The level of integrated pest management adoption among Ohio master gardeners /

Master of Science, The Ohio State University, 2006, Graduate School

Committee: Not Provided (Other) Subjects:

4. Collins, Roger Ecology and appraisal of pine vole damage in Ohio apple orchards /

Master of Science, The Ohio State University, 1974, Graduate School

Committee: Not Provided (Other) Subjects:

5. Chase, Harvey Some insects injurious to the grasses and cereals of Ohio /

Master of Arts, The Ohio State University, 1915, Graduate School

Committee: Not Provided (Other) Subjects:

6. Sarr, Omar Transformations in Rural Farming Communities: Ox-Plows, Mixed Farming Centers and Agricultural Production in The Gambia, c. 1960s-1970s

Master of Arts (MA), Ohio University, 2024, History (Arts and Sciences)

After the Second World War, Green Revolution techniques were introduced in West Africa to improve agricultural production and reduce poverty. Unlike in Asia and Latin American countries, the techniques in West Africa proved unsuccessful largely because of environmental and political hindrances. In recent years, few West African historians have shown interest in the region's agricultural history, especially during the early post-colonial period. The existing scholarship ignores the several agricultural programs introduced by, for instance, the Gambian government, whose aim was to enhance crop production and boost agricultural exports. Several agricultural schemes were introduced in the Gambia, but these projects appear to have exacerbated rural challenges, including gender inequality and landscape changes. Devastating droughts were also a common occurrence that worsened the situation. Disease outbreaks also devastated the livestock industry. To date, no study has examined why the ox-plows and Mixed Farming Centers of the 1960s and 1970s introduced in rural farming communities failed to yield the desired results. My project intends to investigate the impact of some of these projects, and the reasons for their failure. It also examines how environmental and climatic factors during this period contributed to the disruption of Gambian farming communities.

Committee: Assan Sarr (Advisor); Paul Milazzo (Committee Member); Katherine Jellison (Committee Member) Subjects: African History; Agriculture; Animal Diseases; Gender; Technology

7. Shaw, William Pest Control Problems in Farm Storage Areas

Master of Arts (MA), Bowling Green State University, 1966, Biological Sciences

Committee: William B. Jackson (Advisor) Subjects: Biology

8. Kelih, James An Evaluation of Sanitation and Safety Practices in Grain Elevators

Master of Arts (MA), Bowling Green State University, 1963, Biological Sciences

Committee: William B. Jackson (Advisor) Subjects: Biology

9. Woloschuk, John Testing Spillover of Nocturnal Predators in Agroecosystems: The Influence of Ditch Type and Prey Availability

Master of Science (MS), Bowling Green State University, 2019, Biological Sciences

Predators of crop insects are influenced by a number of variables which affect their foraging in agroecosystems. Though many of these predators, and their movement between crop and non-crop habitats, has been documented, the impact of variation in non-crop habitats is less understood. Here, we sought to understand how ditch geomorphology and prey availability at ditches and cornfields influences the potential spillover of web spiders, ground spiders, and bats. We examined 10 farms across Northwest Ohio, each possessing either a narrow conventional ditch, wider two-stage ditch, or very wide self-forming stream ditch. At each site, we surveyed and collected prey and predators along a transect extending from the ditch up to 200m into the adjacent cornfield, and conducted stable isotope analysis on samples. Stable isotope analysis (δ13C & δ15N) revealed that both web and ground spiders along ditches consume more prey that ate C3 vegetation (e.g. possibly emergent insects or ditch herbivores), while spiders in the fields consume mostly prey that ate C4 vegetation (possibly pests of corn). Guano isotopes indicate bats have highly variable prey consumption (median value around 38.3% of diet made up of C4,with large credible intervals). Web spiders were more abundant along ditches but increased in fields over the course of the season (p=0.001). Bat activity was higher at ditches than in adjacent cornfields in July-August, with both high and low aquatic insect emergence. However, August-September bats showed higher activity deep within the fields during periods of high aquatic prey availability at ditches (p=0.032). Isotopes suggest that spiders do not spillover between ditches and fields, but they were abundant in fields and ate prey with a C4 (corn-based) diet. Recording data and isotopes together suggest bats do consume prey from both ditches and cornfields. Ditch geomorphology was not found to have an effect on the response of abundance or activity of predators and prey (open full item for complete abstract)

Committee: Kevin McCluney PhD (Advisor); Jessica D'Ambrosio PhD (Committee Member); Karen Root PhD (Committee Member) Subjects: Agriculture; Biology; Ecology

10. O'Brien, Erin Conserving Ash (Fraxinus) Populations and Genetic Variation in Forests Invaded by Emerald Ash Borer Using Large-scale Insecticide Applications

Doctor of Philosophy, The Ohio State University, 2017, Entomology

Emerald ash borer (EAB) has killed millions of trees since its accidental introduction to southeastern Michigan more than 20 years ago. Near the invasion epicenter, nearly all mature ashes have died, reproduction has ceased, and the seed bank depleted, leaving an “orphaned” cohort of established seedlings and saplings. Because of high seedling mortality, it is possible that seedlings that established recently may have lower genetic variation than those that established before the EAB invasion. Insecticides can successfully protect ash trees from EAB and clusters of treated ash trees may slow ash mortality by reducing EAB densities. Therefore, insecticides, in high enough densities, may protect ash trees in order to maintain reproduction, regeneration, and genetic variation. I tested these questions at Five Rivers Metroparks in southwestern Ohio and the Upper Huron River Watershed in southeastern Michigan. From 2014 – 2016, green and white ash mortality differed between parks, with survival higher at Sugarcreek, Englewood, and Germantown Metroparks (low EAB impact) than at Cox Arboretum, Taylorsville, and Twin Creek (high EAB impact). I found that survival of untreated green-white ashes increased with percentage of ash phloem area treated, but only in parks with low EAB impact. Additionally, survival of untreated trees was higher when the nearest treated ash was within 100 m, percentage of ash phloem treated was high, and EAB impact was low. However, this pattern was not observed in parks with high EAB impact. These results suggest that treating ash trees with insecticide may slow the progression of ash mortality if the program is initiated when ash mortality is still low. There were more flowering green and white ash trees (treated and untreated) in plots with higher percentage ash phloem treated. In parks with high EAB impact, seedling density was low and was not affected by insecticide treatment. In parks with low EAB impact, seedling densities increased w (open full item for complete abstract)

Committee: Daniel Herms (Advisor); Mary Gardiner (Committee Member); P. Charles Goebel (Committee Member); Andrew Michel (Committee Member) Subjects: Ecology; Entomology

11. Alm, Steven Monitoring and control of Conotrachelus nenuphar (Herbst) and Glischrochilus quadrisignatus (Say) : (Coleoptera--curculionidae, nitidulidae) /

Doctor of Philosophy, The Ohio State University, 1985, Graduate School

Committee: Not Provided (Other) Subjects: Biology