Fall Armyworm Resistance in Corn and Its Supression of Larval Survival and Growth1
- W. Paul Williams,
- Frank M. Davis and
- Billy R. Wiseman2
The fall armyworm [Spodoptera frugiperda (J. E. Smith)] is a serious pest of late planted corn (Zea mays L.) in the South; however, corn genotypes which show reduced leaf feeding damage have been developed. To study the effects of corn genotypes with and without resistance to leaf feeding by the fall armyworm on larvae development, field tests were conducted at Mississippi State, Miss. and Tifton, Ga. in 1980 and 1981. Experiments at Tifton were grown on a Tifton loamy sand (fine-loamy, siliceous, Thermic, Plinthic Paleudult), and the experiments at Mississippi State were grown on a Leeper silty clay loam (fine, montmorillonitic, nonacid, thermic, Vertic Haplaquepts). Standard corn production practices were followed although soil insecticides were not applied. Fall armyworm larvae were placed in the whorls of susceptible and resistant corn genotypes at the 5 and 10-leaf stages of growth. Fewer larvae were recovered from the resistant than the susceptible genotypes 8 days after infestation. Larvae produced on the resistant corn genotypes were also smaller than those produced on susceptible genotypes. Both number of surviving larvae and larval weights were highly correlated with leaf feeding ratings. Selections for reduced larval survival and growth, as well as reduced leaf feeding damage, should enhance efforts to develop corn genotypes with higher levels of resistance to fall armyworm.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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