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Published in Crop Sci 20:812-814 (1980)
© 1980 Crop Science Society of America
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Maize Yield Losses Caused by Southern Corn Rust1

Roduel Rodriguez-Ardon, Gene E. Scott and Stanley B. King2

Southern corn rust, caused by Pucclnia polysora Underw. causes severe yield losses on maize (Zea mays L.); especially on late planted maize in the South. Near-isogemc crosses were used to determine the extent of yield losses caused by this disease. Susceptible hybrids, in three biweekly plantings (beginning about 25 May) in 1976 and 1978, showed average yield reductions of 4, 23, and 45%. Reduced kernel weight accounted for some but not all of the loss in yield.

Key Words: Zea mays L. • Puccinia polysora • Isogenic crosses

1 Contribution from the Crop Science and Engineering Research Laboratory, Delta States Area, AR-SEA-USDA and the Mississippi Agric. and Forestry Exp. Sin., Mississippi State, MS 39762. Published as Paper No. 5046.

2 Former graduate student (presently assistant head for crops, National Program of Agric. Research, Comayagua, Honduras); research agronomist, AR-SEA-USDA, and professor of agronomy, Mississippi State Univ., and research plant pathologist, AR-SEAUSDA, and adjunct associate professor of plant pathology, Mississippi State Univ., respectively.

Received for publication March 31, 1980.




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