Integrated Crop Management News
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By Stephen K. Barnhart, Department of Agronomy
There continue to be questions about cover crops and prevented planting options. With the ‘no grazing or harvest until after Nov. 1‘ qualifier, here are my initial thoughts.
‘Spring cereals’ – oats, spring triticale, barley, spring wheat
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.
By Roger Elmore and Mahdi Al-Kaisi, Department of Agronomy
Iowa’s wet spring and cool temperatures not only slowed planting progress but also slowed Growing Degree Day accumulations. These factors contributed to yellow corn plants across the state as well as within-row variability in plant to plant growth and development. Seedling diseases reduced stands.
By Erin Hodgson and Adam Sisson, Department of Entomology
A few areas of Iowa are approaching 50 percent corn rootworm egg hatch now (Figure 1), including the Muscatine area. Many other regions will be reaching 700 degree days within 7-14 days, depending on future temperatures. Cooler spring temperatures in 2013 have slowed down development, especially compared to rootworm hatch last year.
By John Sawyer, Department of Agronomy
By Greg Tylka, Department of Pathology and Microbiology
The soybean cyst nematode (SCN) is one of the most damaging pests of soybean in Iowa and the Midwest. SCN can cause foliar symptoms of soybean sudden death syndrome (SDS) to occur earlier in the season and to become more severe, leading to increased yield losses from the disease.
SCN females on roots marks end of first generation