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Iowa State University

Plant Sciences

Graduate Theses and Dissertations

Seed treatment

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Efficacy Of Soybean Seed Treatments In Iowa And The Effect Of Cold Stress On Damping-Off Caused By Pythium Sylvaticum, Mauricio Serrano Jan 2017

Efficacy Of Soybean Seed Treatments In Iowa And The Effect Of Cold Stress On Damping-Off Caused By Pythium Sylvaticum, Mauricio Serrano

Graduate Theses and Dissertations

Soybean (Glycine max (L.) Merr.) production is negatively affected by the occurrence of seedling diseases. In Iowa, the occurrence of seedling diseases is commonly associated with cool and wet weather soon after planting, and several Pythium spp. have been found as the predominant pathogens causing seedling disease. Increasing cost of the seed, risk of seedling diseases reducing stand in cold, wet soils, and the yield benefit sometimes provided by early planting have motivated an increase in the use of fungicide seed treatment. However, a positive effect of seed treatments on soybean plant stand and yield has not been clearly demonstrated ...


Integrating Soybean Aphid And Soybean Cyst Nematode Management, Michael Thomas Mccarville Jan 2014

Integrating Soybean Aphid And Soybean Cyst Nematode Management, Michael Thomas Mccarville

Graduate Theses and Dissertations

Soybean aphid, Aphis glycines, and soybean cyst nematode (SCN), Heterodera glycines, can interact through the soybean plant resulting in increased SCN reproduction on both SCN-resistant and SCN-susceptible varieties. The management of SCN is heavily reliant on the planting of PI 88788-derived SCN-resistant varieties to limit yield loss to SCN in the current year and future years. Virulence to PI 88788 is increasing in SCN field populations due to its extensive use. Therefore, it is increasingly important to manage any factor that increases SCN reproduction on SCN-resistant varieties. Here I examined management tactics including host-plant resistance and insecticidal seed treatments to ...


Effects Of Maturity Group, Seed Composition And Storage Conditions On The Quality And Storability Of Soybean (Glycine Max L. Merrill) Seed, Gladys Y. Mbofung Jan 2012

Effects Of Maturity Group, Seed Composition And Storage Conditions On The Quality And Storability Of Soybean (Glycine Max L. Merrill) Seed, Gladys Y. Mbofung

Graduate Theses and Dissertations

Soybean seed is usually not carried-over to the next planting season because it deteriorates rapidly in storage, resulting in poor growth when planted. This rapid deterioration is a serious problem in seed production. The short shelf life of soybean seed is the result of its high lipid content and high levels of polyunsaturated linolenic and linoleic acids. The soybean production practice of planting early to maximize yield has led to routine use of seed treatments to protect the seeds and seedlings during the early stages of development. The amount of treated seed is increasing every year as research identifies more ...


Interactions Between Lesion Nematodes And Corn Pathogens, Marcos Paulo Da Silva Jan 2010

Interactions Between Lesion Nematodes And Corn Pathogens, Marcos Paulo Da Silva

Graduate Theses and Dissertations

Root-lesion nematodes (Pratylenchus spp.) are migratory endoparasites of a variety of hosts worldwide. They are among the most common parasitic nematodes that feed on maize roots at all plant growth stages. Maize seedlings also are commonly attacked by pathogenic fungi and Oomycetes. The combination of nematode and fungus often results in a synergistic interaction wherein the crop loss is greater than expected from either pathogen alone or an additive effect of the two together. These interactions have been described from several crops, but lesion nematode-seedling pathogen interactions on maize (Zea mays L.) have not been intensively studied. Developments in seed ...


Use Of Seed Treatments And Inoculants In No-Tillage Soybean Production Practices, Joseph John Osenga Jan 2009

Use Of Seed Treatments And Inoculants In No-Tillage Soybean Production Practices, Joseph John Osenga

Graduate Theses and Dissertations

Soybean producers using no-tillage practices in the Upper Midwest encounter cooler, wetter soil conditions early in the growing season that slow crop growth and favor damping-off pathogens. The goal of this thesis work was to evaluate the use of soybean seed treatments and inoculants in no-tillage compared to conventional tillage practices in Iowa. The research reported in this thesis is divided into three specific objectives. The first objective was to evaluate the use of soybean seed treatments and inoculants in no-tillage and conventional tillage across Iowa. It was concluded that there was no evidence that the use of seed treatments ...