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PHAGOSTIMULANTS FOR SPODOPTERA EXEMPTA: IDENTIFICATION OF ADENOSINE FROM ZEA MAYS

Young maize plants, a preferred food for Spodoptera exempta, were investigated for the presence of phagostimulant chemicals. Bio‐assay showed that biting incitants were present in the hexane‐soluble extract whereas true feeding stimulants were retained in the aqueous part. The water‐soluble feeding stimulants were identified by 13C‐nmr and mass‐spectral data as sucrose and adenosine. Both compounds were also active for the more polyphagous larvae of S. litura.