The European Corn Borer, Pyrausta Nubilalis (Hubn), and Its Principal Host Plant. V. A Chemical Study of Host Plant Resistance.

Abstract
The isolation and distribution of substances present in the corn plant, Zea mays which are inhibitory to P. nubilalis were studied. One such inhibitor, 6-methoxy-2(3)-benzoxazolinone (I), was isolated utilizing ion-exchange chromatog-raphy and a bioassay involving Penicillium chrysogenum. Another inhibitor (n) (water-soluble, ether-insoluble) was detected. The distribution of I in the developing maize plant showed a relationship to its resistance to P. nubilalis. Role of I and II in such resistance and also their possible role in fungal resistance are discussed.

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