By Alison Robertson, Department of Plant Pathology and Microbiology
This will be our third year surveying soybean fields with seedling blight in an effort to identify what pathogen species contribute to stand loss in Iowa. This survey is part of multi-state projects funded by USDA NIFA and check-off funds from the United Soybean Board and the North Central Soybean Research Project. One goal of the research is to develop diagnostic kits that could be used to identify the causal organisms responsible for seedling blight in a field.
To date, more than 83 oomycete species (Pythium, Phytophthora, Phytopythium and Aphanomyces) have been recovered from soybean seedlings sampled from throughout the North Central Region. Fungal species associated (for example, Fusarium and Rhizoctonia) with diseased soybean seedlings are being identified. Pathogenicity and fungicide sensitivity assays for each species are in progress.
Do you know of a soybean field with seedling disease? If yes, please contact Alison Robertson, firstname.lastname@example.org or 515-294-6708, so that we can arrange to visit the field and sample seedlings.