Loss in Yield of Dent Corn Infested with the August Generation of the European Corn Borer1

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Abstract
Different plots of hybrid corn were infested by hand with varying numbers of egg masses to coincide with the natural infestation of the Aug. generation of the multiple-generation strain of Pyrausta nubilalis. Single and double cross hybrids were tested in 1944 and 1945. As an avg. of the 2 yrs., hybrids with potential yields of 66.8 bushels per acre lost 1.21 bushels or 1.81% of their yield per borer per plant and this loss increased by linear regression to 2.61 bushels or 2.95% as the potential yield increased to 88.5 bushels. In 1945, commercial hybrid Ind. 610B planted on May 30 and June 11 had its potential yield of 118.6 and 107 bu. per acre reduced 1.39 and 2.21%, respectively, per borer per plant. In 1946, the same hybrid planted on May 21, May 31, and June 10 had its potential yield of 123.4, 118.1 and 108 bu. per acre reduced 1.56, 2.18 and 2.1, respectively, per borer per plant. In 1945, groups of late white single cross hybrids with potential yields of 68.5 and 83.5 bu. per acre had those yields reduced 4.03 and 3.47% respectively. In the 1944 expt., 3 hybrids involving line Ind. P8 crossed on Ia. L304A, Kan. K230, and Ind. Wf9 had their yields reduced an avg. of 108 bu. per acre by each additional borer per plant compared with 1.57 bu., the predicted avg. In 1945, 3 hybrids involving line P8 crossed on Ill. Hy. Ind. 38-11, and Ind. B2 had their yield reduced about 1.27 bu. per acre per borer per plant compared with 1.62 bu. for hybrids involving line Wf9 crossed on the same lines. Also, 4 hybrids with P8 crossed on 38-11, B2, WF9 and WF9A had their acre yield reduced about 1.11 bu. per borer per plant compared with 2.25 and 3.09 bu. for hybrids having Hy. and la. L317, respectively, crossed on the same lines.

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