THE FINAL “FOUR-WAY” HYBRID CROSS-the fourth step 
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^HEN llie SEED SUPI’LY used in plcintin^; 
'• the two “single crosses” becomes large enough, 
the final “four-way” hybrid seed is produced in 
large PIONEER crossing fields from which the 
commercial corn is picked. 
These fields require hundreds of capable men 
each summer for detasseling work. The fields are 
detasseled from twelve to fifteen times. 
PIONEER corn breeders alternate four rows of 
one “single cross” ( AxB) w ith one row of another 
“single cross” fCxU) all through a field. Each 
group of four rows (female) is detasseled, and the 
pollen from tassels of tlie one row (male) cross- 
pollinates the silks of the detasseled rows. The 
result is a “four-way” hybrid cross. 
PIONEER Hybrid Seed Corn is picked only from 
the detasseled rows. The corn harvested from the 
male rows pollinated itself and cannot be used as 
hybrid seed corn. 
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HUNDREDS AND HUNDREDS OF CAPABLE DETASSELERS WORK IN PIONEER SEED FIELDS EVERY SUMMER 
