PROPAGATION OF TREES AND SHRUBS 27 



tings of M. arnoldiana rooted 60 percent after treatment with indolebutyric 

 acid (50 mg./L, 20 hr.), although not at all without treatment. Early July 

 cuttings of M. pumila var. Eleyi (the common apple is M. putnila) rooted 70 

 percent in sand after treatment with indolebutyric acid (50 mg./L, 4 hr.), 

 not at all without it (125). Cuttings of another variety rooted well after 

 treatment with naphthaleneacetic acid (20 mg./L, 24 hr.) if they were 

 taken in spring or early summer before growth had been completed (81). 

 There was no rooting of similar cuttings of Siberian crab whether or not 

 they were treated (113). 



Hardwood cuttings of some varieties of the common apple, made of 

 wood in its first, second, or third year (126) will rout, but propagation in 

 this way has not in the past proved commercially practical (12). Cuttings 

 of Northern Spy taken in March rooted 25 percent in peat moss at 65° F., 

 not at all in sand-peat or sand (66). Similar cuttings of Delicious failed 

 to root even after treatment (95). There was 75 to 100 percent rooting 

 of hardwood (November to February) cuttings of Rhode Island Greening 

 and Grimes Golden which were made of tips of the current year's growth, 

 treated with indolebutyric acid (40 mg./L, 24 hr.), and immediately buried 

 in moist peat moss, but no rooting of untreated cuttings (48, 49). At- 

 tempts to repeat this with cuttings of Mcintosh taken here in February 

 and March were unsuccessful. Best rooting, only 20 percent, was of 

 treated cuttings made of wood two years old or of tips of the newest 

 growth, but the rooted cuttings died when transplanted. 



Myrica Gale, sweet gale, is easily propagated by softwood cuttings. Un- 

 treated cuttings which were taken here in late June rooted 85 percent in 

 sand in 57 days. July cuttings rooted 100 percent in sand-peat in 38 days 

 after treatment with indoleacetic acid (100 mg./L, 24 hr.), 60 percent 

 without it (87). 



Ostnanthus ilicifoHus. Summer cuttings root readily in sand (105) or 

 sandy soil (80). Rooting was liastened by treatment with indoleacetic 

 acid (20 mg./L, 24 hr.) (113) or indolebutyric acid (150 mg./L, 4 hr.), but 

 untreated cuttings taken in late July rooted more than 90 percent (125). 



Oxydendrum arboreum, sorrel-tree, can be propagated by softwood cuttings, 

 short side shoots with a heel (80). Late July cuttings rooted 80 percent 

 in sand-peat in 8 weeks after treatment with indolebutyric acid (90 mg./L, 

 8 hr.), less well in sand, and not at all in 8 weeks without treatment (88). 



Pachistima. Cuttings of P. Canbyi and P. Myrsinites taken here in October 

 and November rooted more than 90 percent in sand-peat whether or not 

 they were treated. Softwood cuttings are also successfully taken in July 

 and rooted in sand (67). 



Pachysandra terminalis is easily propagated by July and August cuttings 

 (106). Late June cuttings rooted 100 percent in 28 days after treatment 

 with indolebutyric acid (30 mg./L, 6 hr.), 60 percent without it (83.). 

 Concentrations effective with winter cuttings are naphthaleneacetic acid 

 20 to 100 mg./L, 24 hr., (47) and indolebutyric acid 20 to 40 mg./L, 24 hr. 

 or 5 to 12 mg./gm. talc (49). 



Parrotia per ska. Summer cuttings rooted 100 percent in sand-peat in 38 

 days after treatment with indoleacetic acid (100 mg./L, 24 hr.), less than 

 50 percent without it (87). 



Parthenocissus. Boston ivy and Virginia creeper are easily propagated by 

 softwood cuttings. Untreated August cuttings of the former rooted 90 

 percent in 20 days and treated cuttings rooted no better (16). 



