SCIENTIFIC BREEDING 
PIONEER CORN 
BREEDERS 
This staff of Scientific Corn , 
Breeders is constantly working Mune Dees 
in their laboratory—the rich soil 
of the corn belt—to develop and 
produce hybrid seed corn of su- 
perior quality and outstanding 
performance. : 

Raymond PF. Baker 

Perry M. Collins Samuel F. Goodsell 

Karl Jarvis 

A. R. Marston Ray Snyder Melvin Temple James Weatherspoon 
INBREEDING—First Step 
By inbreeding well selected ears, varied plant 
types are developed. Some off-spring are -out- 
standingly strong and vigorous, while others are 
weak and useless. Each year Pioneer Breeders 
discard hundreds of thousands of weak plants, 
saving only desirable types for further develop- 
ment. 


ONLY THE STRONG OFFSPRING ARE SAVED 
After many years of careful inbreeding, the 
weak and undesirable characteristics are weeded 
out. Only the strongest plants survive the 
vigorous inbreeding period of from five to eight 
generations. 
The result is a pure inbred—small, frail in ap- 
pearance, but uniform and true to definite char- 
acteristics, such as—disease resistance—plant 
height—stiffness of stalk—heaviness of root sys- 
tem—size of ear—color of leaf and ear height. 
An inbred strain remains pure and breeds true 
oe to its characteristics as long as foreign pollen 
UNIFORMITY OF PIONEER INBRED STRAINS does not contaminate it. 



