Fall Armyworm Symposium: Activity of Maize Leaf Cuticular Lipids in Resistance to Leaf-Feeding by the Fall Armyworm

Guang Yang, David J. Isenhour, Karl E. Espelie


Genotypes of maize, Zea mays L., known to vary in their resistance to fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith), were utilized in a study designed to examine the role that cuticular lipids play in host plant resistance. The surface lipids were extracted from green and yellow whorl foliage of maize genotypes `MpSWCB-4', `Cacahuacintle X's', `Pioneer 3192' and `Pioneer X304C'. FAW larvae were reared on meridic diet to which either the extracted foliage or unextracted foliage had been added. FAW growth was monitored and shown to be enhanced when larvae were reared on diet containing foliage from which the cuticular lipids had been removed. Additionally, FAW growth was inhibited when larvae were fed meridic diet containing cuticular lipid extracts from foliage of the four maize genotypes.

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