PROPAGATION OF TREES AND SHRUBS 13 



Abeliophyllum distichum. Untreated hardwood cuttings which were taken 

 here in mid-March and immediately inserted in sand-peat rooted 63 

 percent in 10 weeks. 



Abies, fir. February cuttings of Colorado fir, untreated, rooted 60 percent 

 in peat moss, little or not at all in sand-peat or sand (67). Sandy soil 

 is the English rooting medium (7). Rooting of winter cuttings of Spanish 

 fir and Veitch fir was improved by treatment with indolebutyric acid 

 40 to 80 mg./l., 24 hr., or 12 mg./gm. talc (61). Cuttings of Spanish fir 

 also responded to treatment with 10 to 20 mg./cc. applied by the con- 

 60 percent without treatment (87). 



Acanthopanax Sieboldianits. Late June cuttings rooted 7Z percent in 27 days 

 after treatment with indolebutyric acid (20 mg./l., 24 hr.), not at all mean- 

 while without treatment (57). August cuttings rooted 50 percent in 55 

 days without treatment, 80 percent with treatment (100 mg./l., 20 hr.) (83). 



Acer, maple. Hardwood, late November, cuttings of silver maple which 

 were buried in a cool place until February and then planted in sand at 72° F. 

 rooted 84 percent (52). Hardwood, late winter or early spring, cuttings of 

 A. barbinerve, A. caudatum, A. cissifolium, A. rufinei-ve, and A. Tschonoskii 

 rooted 20 to 80 percent in 4 to 9 weeks in sand at 70° to 74° F., bottom 

 heat (111). 



The best time to take softwood cuttings of maples is probably late spring 

 and early summer. Cuttings of Acetr argiituin, A. barbino've, box-elder, and 

 Japanese maple which were taken, with a heel, when oldest leaves were 

 no more than half grown rooted 35 to 100 percent in sand in 18 to 60 

 days (111). Such cuttings responded to treatments with indolebutyric 

 acid. Equivalent concentrations for June cuttings of Japanese maple are 

 2 to 5 mg./gm. talc or 10 to 40 mg./l., 24 hr. (49). Early July cuttings 

 of red maple rooted 60 percent after treatment (20 mg./l., 24 hr.), not 

 at all without it (1). June cuttings of silver maple rooted 85 percent 

 after treatment (50 mg./l., 32 hr.), not at all without it (65). June cut- 

 tings from very young Norway maples responded slightly to treatment 

 with indoleacetic acid (100 mg./l., 24 hr.) (109). Cuttings of sugar maple, 

 taken in early summer, rooted 100 percent in sand-peat in 40 days after 

 treatment with indoleacetic acid (10 mg./l., 48 hr.), 33 percent without 

 ireatment (87). Snow (92) took cuttings of sugar maple from young 

 trees, made them four inches long with all leaves but the upper removed, 

 and set them deeply in sand-peat in an outdoor propagating frame. By 

 the end of summer, the cuttings which he took in mid-June had rooted 

 25 to 36 percent without treatment and about 66 percent after treatment 

 with indolebutyric acid (50 mg./l., 3 hr. ). Results were decidedly less 

 good with cuttings taken in July. 



Actinidia. Cuttings are taken in summer and fall. September cuttings of 

 A. arguta, in sand, rooted 86 percent in one month after treatment with indole- 

 butyric acid (5 mg./l., 24 hr.), 42 percent without it (96). Equivalent con- 

 centrations for treatment of December cuttings are 20 to 40 mg./l., 24 hr. ; 

 4 to 10 mg./gm. talc; or, by the concentrated solution-dip method, 1 to 4 

 mg./cc. (49). July cuttings of A. chinensis, in sand-peat, rooted 100 per- 

 cent in 40 days after treatment with indoleacetic acid (100 mg./l., 48 hr.), 

 60 percent without treatment (87). 



Ahius, alder. Cuttings, which do not root very readily, are taken in autumn 

 as soon as the leaves fall and inserted in sandy soil (7). 



