HAND POLLINATING PLOTS 
Pioneer maintains hand pollinating plots in Iowa at Johnston and Algona. 
Pioneer breeding plots are maintained at Princeton and Harvard, Illinois 
. . Poseyville and Tipton, Indiana .. . and Yellow Springs, Ohio. 
Approximately 400 inbreds 
... pure lines... with 5 
or more generations of in- 
breeding ... were worked 
with last season. 
280 of these inbreds were 
developed by and are used 
exclusively by Pioneer... 
120 were released for use 
by various agricultural experiment stations and other 
corn breeders. 


Each year new inbreds are added—after they have 
completed their development cycle. 
Accurate records are kept on the development and 
performance of each of these inbreds. Stn nice an cLeea 
BREEDING and TESTING 
...in the Winter... 
Extensive testing and breeding 
research continues during the 
winter months in greenhouses . . . 
testing and breeding for resistance 
to the various corn diseases. 


