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Effect of Race T of Helminthosporium maydis on Corn Grain Yield 1
Author(s) -
Jellum M. D.,
Ethredge W. J.
Publication year - 1971
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1971.00021962006300040040x
Subject(s) - sowing , blight , hybrid , agronomy , yield (engineering) , biology , zea mays , grain yield , horticulture , metallurgy , materials science
Abstract The effect of southern corn leaf blight ( Helminthosporium maydis ) on corn ( Zea mays L.) yield as related to dates of planting was determined in 1970 at two locations in Georgia. Estimates of yield loss were based on the relative yields of six susceptible hybrids and one resistant hybrid grown under disease‐free conditions in 1969 and under a severe epiphytotic of southern corn leaf blight in 1970. Yield of susceptible hybrids from the earliest planting date (April 8 and 9) was not reduced by leaf blight in 1970. Yield was reduced by 23% when hybrids were planted on May 8 in the Piedmont region, compared with 46% when planted on May 1 in the Upper Coastal Plain region. A late planting date at each location resulted in an estimated yield loss of 71%.