2014
Getting to know the players on seedling disease field
Contributor/Checkoff:
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Lead Principal Investigator:
Alison Robertson, Iowa State University
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

Seedling diseases are caused by oomycetes, namely Pythium spp. and Phytophthora sojae, and fungi (Fusarium ssp. and Rhizoctonia solani). With the exception of P. sojae, there is limited information on the biology and epidemiology of many of the pathogens associated with seedling diseases. The goal of this project is to improve our understanding of the biology and epidemiology of Pythium ssp. causing seedling disease.

Unique Keywords:
#outreach and education, #soybean diseases, #soybean seedling diseases
Information And Results
Project Deliverables

Final Project Results

We have completed pathogenicity and fungicide assays of Pythium lutarium, P. oopapillum, P. torulosum, and P. sylvaticum with strains collected from soybean and corn in Iowa. Twelve isolates that are representative of four species of Pythium, P. lutarium, P. oopapillum, P. torulosum, and P. sylvaticum, were screened for sensitivity to fungicides in a Petri dish assay. Fungicides evaluated include metalaxyl (Allegience), ethaboxam (new fungicide from Valent), azoxystrobin (Dynasty), pyraclostrobin (Headline), trifloxystrobin (Trilex), captan, and thiram. We have shown that temperature affects pathogenicity and fungicide sensitivity. This is the first time temperature has been reported to affect fungicide sensitivity and implies that soil temperatures at planting could influence the efficacy of a seed treatment depending on the pathogen profile of the field.

Four presentations detailing results of this research were given to approximately 2000 stakeholders in Iowa at various ISU Extension and Outreach programs. Furthermore, a trifold publication entitled ‘Scouting for Pythium root rot of soybean’ that describes this seedling disease was distributed to 12 North Central states and Ontario, Canada.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.