Plants under stress due to environmental factors, such as extreme temperature and moisture are more susceptible to disease, and many were under stress due to the unique environmental conditions in 2019.
Fungicide resistance was confirmed in soybean samples from 10 Nebraska counties infected with the frogeye leaf spot pathogen. Tar spot, a fungal disease of corn, has been confirmed in numerous western Iowa counties and is likely to reach Nebraska in 2020.
In 2019, wet weather during the growing season favored the development of wheat diseases including Fusarium head blight, leaf rust, stripe rust, bacterial streak, and take-all. This update highlights these diseases, the environmental factors that favor their development, and their management.
Continuous corn is the most common irrigated crop sequence in southwest Nebraska. Although rotating to other crops, such as soybeans, can mitigate some production issues of continuous corn and often boost the next year’s corn yield, larger adoption of soybean has not readily occurred in this area.
The western bean cutworm is a pest of corn and dry bean. Typically, control is achieved by pyrethroids or transgenic traits. However, control with pyrethroids may prove difficult and transgenic traits are not available for dry bean. Biological control may prove to be a useful tool for growers of both crops.