Close-up of Target Spot Lesion Photo Credit: Heather Kelly – UT
Target spot is caused by the fungus Corynespora Cassiicola that overwinters in diseased debris and can survive in fallow soil for more than 2 years. Symptoms appear in the lower canopy as brown round to irregular lesions sometimes with a yellow halo. Lesions vary from specks to mature spots 10-15 mm or more in diameter. Some lesions are distinctly zonate, hence the common name.