VEGETATIVE PROPAGATION EXPERIMENTS IN WHITE PINE 523 



investigating. In the described tests, P. griffithii x strobus was 

 superior to P. strobus. The better rooting ability of the hybrid may be 

 inherited from P. griffithii or it may be a quality of this interspecific 

 hybrid, characterized by hybrid vigor. 



The between species variation in rooting ability of white pines and 

 the between and within population variation in the rooting ability of 

 eastern white pine are now under investigation. I expect to obtain 

 information which will enable me to choose species, hybrids, populations 

 and individuals of superior rooting ability. 



SUMMARY 



The December, January and March planting dates showed no significant 

 differences. Rooting decreased with age, but no difference was noted with 

 propagules taken from trees up to 10 years of age. Needle fascicles 

 without buds rooted as well as cuttings. Propagules developed an evenly 

 distributed and balanced root system when planted in slit plastic tubes. 



Differences in rooting existed within and between populations. The 

 cuttings of P. griffithii x strobus rooted better than those of P. strobus. 

 Future experiments may provide more information on variation in rooting 

 ability. 



LITERATURE CITED 



Delisle, A. L. 1954. The relationship between the age of the tree and 

 the rooting of cuttings of white pine. Ind. Acad. Sci. Proc. 64: 

 60-61. 



Doran, W. L., R. P. Holdsworth, and A. D. Rhodes. 1940. Propagation of 

 white pine by cuttings. J. Forest. 38: 817. 



Farrar, J. L., and N. H. Grace. 1940. Note on the propagation by cuttings 

 of white pine and white spruce. Can. J. Res. C.18: 612. 



Farrar, J. L., and N. H. Grace. 1942. Vegetative propagation of conifers: 

 XII Effects of media, time of collection and indole-acetic acid treat- 

 ment on the rooting of white pine and white spruce cuttings. Can. J. 

 Res. C. 20: 116-121, 204-211. 



Hoff, R. J., and G. I. McDonald. 1968. Rooting of needle fascicles 

 from western white pine seedlings. U.S. Dep. Agr. Forest Serv. , 

 Intermountain Forest and Range Exp. Sta. Res. Note INT-80. 6 p. 



McLean, M. M. 1959. Experimental planting of tubed seedlings 1958. 

 Ont. Dep. Lands & Forests Res. Report 39. 13 p. 



Mergen, F. and B. A. Simpson. 1964. Asexual propagation of Pinus by 

 rooting needle fascicles. Silvae Genet. 13: 133-139. 



Nienstaedt, H. , F. C. Cech, F. Mergen, C. Wang and B. Zak. 1958. Vege- 

 tative propagation in forest genetics research and practice. J. 

 Forest. 56: 826-839.. 



Patton, R. F. and A. J. Riker. 1954. Top growth and root development of 

 rooted white pine cuttings. J. Forest. 52: 675-677. 



Patton, R. F. and A. J. Riker. 1958a. Blister rust resistance in eastern 

 white pine, p. 46-51. In Proc. 5th Northeastern Forest Tree Improv. 

 Conf. 86 p. 



Patton, R. F. and A. J. Riker. 1958b. Rooting cuttings of white pine. 

 Forest Sci. 4: 116-127. 



Snow, A. G., Jr. 1940. Rooting white pine cuttings. U.S. Dep. Agr., 

 Northeastern Forest Exp. Sta. Occas . Paper 11. 



