Mechanical detasselers are self-propelled, high-clearance machines that remove tassels from female parents by either cutting or pulling
http://books.google.ro/books?hl=en&id=YiU3veyMOvkC&q=mechani...
http://ttsharkey-detasselingmachines.blogspot.com/

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Note added at 23 mins (2010-05-26 11:13:21 GMT)
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Unlike all other major grain crops, the corn plant has separate male and female flowering parts. The tassel and ear shoot are the male and female flowering structures, respectively, of the plant.

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Note added at 3 hrs (2010-05-26 13:54:15 GMT)
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Am găsit un site al producătorului italian al acestor maşini agricole
Self-propelled machine for the emasculation Castrix type S2 equipped with cutting bar with disks 6 rows.
http://digilander.libero.it/zonicarlo/english/products.htm

Emasculation o fi mai pitoresc, dar operaţiunea e cunoscută ca detasseling in engleză: http://en.wikipedia.org/wiki/Detasseling