Disease development will be most rapid in low areas of the field that are poorly drained or where compacted soils are present, but can occur in well-drained fields during periods of excessive moisture.
Following identification of southern rust, Phytophthora root and stem rot, and frogeye leaf spot in areas throughout the state, producers are encouraged to scout and be prepared to apply the appropriate fungicide treatments.
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.
As conditions heated up the last two weeks, the fungus causing phytophthora root and stem rot became active in irrigated fields and those fields that received significant rain over the past couple weeks. Growers are encouraged to scout for this disease and, if found, manage through seed selection and treatment for the next crop.