PROPAGATION OF WHITE PINE 



Table 1. — The Rooting of Cuttings Taken From the North and 

 South Sides of Trees. 



Percentage Rootins 



Treatment of Cuttings* 



Check 



IB 200 mg./l., 5 hr 



Hormodin No. 3.. 



Ferniate-Hormodin No. 3_ 



*See Footnote 5, o. 4. 



rooted (27) but the writer did no work with them since such rooted brachyblasts 

 usually lived no more than a few months. 



Cuttings were usually so made as to consist onl\- of wood in its first } ear, wood 

 which grew in the previous summer, with the basal cut at or slightly below the 

 base of such wood. A bit of heel on the cuttings is desirable. Cuttings taken in 

 winter and treated with indolebut}Tic acid (2 mg./gm. talc) footed better if 

 torn from the branch with a small heel of bark or older wood remaining attached 

 to the cutting than if made without such a heel (4). 



Cuttings made to include all of the wood of the last two growing seasons rooted 

 less well or, as may be seen by reference to Table 2, were less responsive to treat- 

 ments with root-inducing substances. Cuttings of the first tree were taken Jan- 

 uary 6, those of the second tree February 3. In both cases, cuttings detached at 

 the base of the 1940 growth were compared with cuttings detached at the base of 

 the 1939 growth. Untreated, these two t\'pes rooted ecjually poorly, but results 

 with treatments were all in favor of using cuttings one year rather than two years 

 old. 



Table 2. — The Effect of Age of \\'ood on the Rooting of Cuttings. 



Percentage Rooting 



Treatment of Cuttings* 



Second Tree 



Wood of 



Last Two W^ood of 

 Last Years Last Year 



Check - 



IB 200 mg./l., 5 hr 



IB 150 mg./l., 7 hr -_ 



IB 100 mg. and NA 50 mg./l., 4 hr. 



NA 100 mg./l., 4 hr 



Hormodin No. 3 







35 



27 



17 



*See Footnote 5, p. 4. 



Clonal Variations in Ability to Root 



Clones, i.e., individual trees and their vegetatively propagated progeny, may 

 differ in behavior as well as morphologically. The rooting ability of cuttings from 

 different Norway spruces is known to differ markedly, one tree from another (3), 

 and in recent work of the author, this was found to be true also of cuttings from 

 different trees in the case of hemlock, Tsitga canadensis (L.) Carr. 



