Epidemiology of Southern Corn Leaf Blight in Continuous Corn Culture

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Abstract
The influence of cultural practices on the epidemiology of southern corn (Z. mays) leaf blight (SCLB) in continuous corn culture was investigated. Field tests showed that tillage practices, row spacing and fertilizer application methods influenced the development of SCLB in early growth stges of corn but not after tasseling. Tillage systems did not influence the resistance or susceptibility of cultivars to Drechslera maydis race O. In greenhouse studies, no one method of evaluation was adequate to show differences in disease reaction among cultivars. The number of lesions per plant, lesion size, number of conidia per lesion, and number of conidia per square millimeter of lesion were the most useful parameters in determining resistance of cultivars to the SCLB pathogen. Losses may be severe if cultivars susceptible or moderately susceptible to SCLB are grown in continuous corn culture with minimum tillage under overhead irrigation.

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