Field Crop Pathology

Oomycete pathogens including multiple Pythium spp. and Phytophthora sojae can significantly affect stand establishment and root health of soybeans. We are leading efforts to identify the predominant oomycete pathogens of soybean seedling across the primary soybean producing states. To date we have identified more than 55 species of Pythium that are associated with soybean seedling disease, our next objectives are to determine which of these species are actually pathogens and then use information from the survey and the pathogenicity screen to develop molecular diagnostics for improved management. By knowing the primary pathogens that cause soybean seedling and root rot disease we can more effectively screen seed treatments, soybean germplasm and examine management techniques for improved management of these diseases.

To read more about this project you can also visit the project website, or view our recent publications: 

Rojas, A., Jacobs, J. L., Napieralski, S., Karaj, B., Bradley, C. A., Chase, T., Esker, P., Giesler, L., Jardine, D., Malvick, D., Markell, S., Nelson, B. D., Robertson, A., Rupe, J. C., Smith, D., Sweets, L., Tenuta, A., Wise, K., and Chilvers, M. I. 2016. Oomycete species associated with soybean seedlings in North America – Part I: Identification and pathogenicity characterization. Phytopathology.

Rojas, J. A., Jacobs, J. L., Napieralski, S., Karaj, B., Bradley, C. A., Chase, T., Esker, P. D., Giesler, L. J., Jardine, D. J., Malvick, D. K., Markell, S. G., Nelson, B. D., Robertson, A. E., Rupe, J. C., Smith, D. L., Sweets, L. E., Tenuta, A. U., Wise, K. A., and Chilvers, M. I.2017. Oomycete Species Associated with Soybean Seedlings in North America—Part II: Diversity and Ecology in Relation to Environmental and Edaphic Factors. Phytopathology.