spot occurs, these crops can ultimately grow and still be resistant to the disease. Although the disease is not eliminated and resistant varieties show disease symptoms, at the end of the growing season, the disease is not as effective in reducing crop yield. SC 407 have been proven to be common corn variety that are resistant to grey leaf spot. If grey leaf spot infection is high, this variety may require fungicide application to achieve full potential. Susceptible varieties should not be planted in previously infected areas (see above). Lennon et al., 2016 uses a near-isogenic line (NIL) to find . Qgls8 is a quantitative trait locus (QTL) for GLS resistance originally from the teosinte Zea parviglumis, introgressed into B73. The Qgls8 QTL is around 130kilobase in chromosome 8. Crop rotation The amount of initial inoculum will be reduced when a crop other than corn is planted for ≥2 years in that given area; meanwhile proper tillage methods are carried out. Clean plowing and 1-year crop rotation in the absence of corn allows for greater reductions of the disease as well. Note that conventional tilling can reduce disease but can lead to greater soil erosion. Residue management Burying the debris under the last year's crop will help in reducing the presence of Cercospora zeae-maydis, as the fungal-infected debris can only survive above the soil surface. Again this technique will aid in reducing the primary inoculum, but it will not completely eradicate the disease. Fungicides Fungicides, if sprayed early in season before initial damage, can be effective in reducing disease. Currently there are 5 known fungicides that treat Corn grey leaf spot: Planting date The impact of GLS is more severe if plants are affected early in their development. Early planting can help reduce yield losses by ensuring the crop is at a later stage of grain fill when conditions are typically favorable for GLS development. Headline EC (active ingredient: pyraclostrobin) Quilt (active ingredient: azoxystrobin + propiconazole) Proline 480 SC (active ingredient: prothioconazole) Tilt 250 E, Bumper 418 EC (active ingredient: propiconazole) Headline EC Headline is to be applied at . For optimal disease control, begin applications prior to disease development (see §Disease cycle). This fungicide can only be applied a maximum of 2 applications/year. Ground and aerial application are both acceptable. Quilt Quilt is to be applied at . Application of Quilt is to be made upon first appearance of