Resistance of corn strains to the corn ear worm
1941
Blanchard, R.A. | Bigger, J.H. | Snelling, R.O.
The corn ear worm (Heliothis armigera Hbn.) injures field corn in the southern portion of the Corn Belt every year and throughout the Corn Belt in occasional years. The development and use of resistant hybrids seems to offer the most promising method of materially reducing ear worm damage to dent corn. The data presented in this paper deal with inbred lines and single-cross combinations grown in plots at three locations during the period of 1937 to 1939. The data indicate that resistance to the corn ear worm is inherited. Some inbred lines tend to be consistently resistant whereas others are definitely susceptible. Single crosses are, in general, less severely damaged than inbred lines. Some inbred lines transmitted a high degree of resistance even when combined in single crosses with susceptible lines. Variability in results occurred with crosses involving a resistant and a susceptible line. The combination of two susceptible lines usually resulted in a susceptible single cross, but one case is cited where a resistant single cross resulted from such a combination. Some inbred lines were stable in their resistance or susceptibility at the different localities included in this study.
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