Resistance of a Maize Population, Fawcc(C5), to Fall Armyworm Larvae (Lepidoptera: Noctuidae)
AbstractField tests at Mississippi State, MS, and Tifton, GA, were conducted to evaluate the effect of resistance of a maize, Zea mays (L.), germplasm population, ‘GT-FAWCC(C5)’, to feeding by larvae of the fall armyworm, Spodoptera frugiperda (J. E. Smith). Plants of selected maize entries were infested at the 8 and 12 leaf stage with two applications of 15 larvae per plant. Resistance traits measured were leaf damage at 7 and 14 days after infestation and number and weight of surviving larvae per plant at 7 and 10 days after infestation. Leaf damage ratings at both 7 and 14 days after infestation and the number and weight of surviving larvae per plant on GT-FAWCC(5) at 7 and 10 days after infestation on GT-FAWCC(C5) equalled the number and weight of surviving larvae on ‘MpSWCB-4’, the resistant check. Both the resistant check and GT-FAWCC(C5) were significantly more resistant to whorl damage than the susceptible check, ‘Ab24E × SC229’, for all resistance traits. It is evident that antibiosis (low weight) and nonpreference (fewer larvae per plant and fewer larvae preferring leaf samples) mechanisms of resistance are present in the GT-FAWCC(C5) population as well as for MpSWCB-4.
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