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The following case is interesting in showing high grade sensitiveness to the shuck, silk and dust from corn in the absence of sensitiveness to the pollen, the grain or corn smut:
A youth, aged 20, had had summer hay fever and asthma for several years. The hay fever symptoms were mild, however, as compared with the asthmatic symptoms. The history disclosed the fact that the symptoms came on while he was occupied in the care of cattle and were found on observation to occur about an hour after the handling or shucking of corn or after exposure to corn dust.
The patient was tested with several hundred materials and gave negative reactions to all of them including corn and other cereal proteins; also negative reactions to corn pollen and other pollens and to several of the fungi and spores including corn smut. He gave intensely positive tests, however, to extracts
Duke WW. SENSITIVENESS TO CORN SHUCK. JAMA. 1932;99(6):468-469. doi:10.1001/jama.1932.27410580002008b