Management
GLS-resistant hybrids from Pioneer
Hybrids with resistance can reduce yield loss due to GLS
Over the past 25 years, Pioneer researchers have continually improved parent lines and hybrids for resistance to GLS
Hybrids and parent lines are rated and screened in "disease nurseries" as well as locations with high levels of natural GLS occurrence
Scores are provided to customers on all Pioneer® brand hybrids to help them select appropriate hybrids for their fields
Hybrids are available with scores as high as "7" for GLS resistance (on Pioneer's 1 to 9 scale where 9 is most resistant)
No hybrid is completely immune to the disease - even the most resistant hybrids can suffer yield loss under high GLS pressure
Crop rotation
May reduce disease pressure, but rotation is only a partial solution
Compared to other residue-borne pathogens, gray leaf spot has longer survival time in debris
Tillage to encourage breakdown of crop residue
Fungicide application. Common fungicides include Headline, Quadris, Quilt, Propimax EC, and Stratego
Read and follow all fungicide label instructions.