I4 6 Yearboo^ of Agriculture 1949 



able source, while saving the price of W. E. McQuiLKiN is a forester at 



nursery stock in the process. Establish- the Northeastern Forest Experiment 



ing a wood lot is an excellent project Station. From 1938 to 1942 he was en- 



for farm boys and many, like their gaged in direct-seeding studies at the 



fathers, derive satisfaction and good Southeastern Forest Experiment Sta- 



experience by starting with seed collec- tion. Dr. McQuilkin is a graduate of 



tion rather than purchased nursery Doane College and the Universities of 



stoc k Nebraska and Pennsylvania. 



CROSSES AMONG THE WHITE PINES ATTEMPTED BETWEEN 1939 AND 1948 AT THE 

 INSTITUTE OF FOREST GENETICS, PLACERVILLE, CALIF. 1 



Pollen parent 



S * * 5 ^ R 



sjilillli, sill Jits 111 



S dr ar<n<* I J H | U ! U ! t I I ! I 1 J t I 



Pinus 



koraiensis 



cembra 



albicaulis U U 



ftexilis U .. U U 



armandi 



ayacahuite 



lambertiana U ....FFF..UU FF F 



parviflora 



peuc e 



pence X strobus 



excelsa ..U .. .. U U U 



monticola U UHFUUH H..H .. F 



strobus F .. F H U 



cembroides U 



monophylla 



eduiis . Y . '?; r ;7r%( '"7. ''!!. .. 



bungeana F 



balfouriana U F U 



aristata tl F .U 



1 F failure. This does not mean that the cross cannot be made but that the attempts to date have 

 failed. 



U unknown results. These represent recent crossing attempts of which the seeds have not yet matured 

 or have not yet been planted. 



H hybrids secured from the cross. 



2 Only those white pines are listed that have been used for crossing. Cones mature approximately 15 

 months after pollination; the success of a cross is not known until the third year, when planted seed from 

 the attempted cross have germinated. 



