38 MASS. EXPERIMENT STATION BULLETIN 382 



treatment, 100 percent in 90 days after treatment with 25 mg./L, 24 hr. 

 Similar cuttings of Vestale, more benefited by 50 mg./L, rooted 87 percent 

 with treatment, 36 percent without it. Cuttings of Reine Elizabeth and 

 Siebold, taken in May, rooted 100 percent in about 4 weeks after treat- 

 jnent with indolebutyric acid 12 mg./gm. talc (49). Similar cuttings of 

 S. villosa, S. Henryi, S. tomentella, and Persian, Hungarian, and Himalayan 

 lilacs rooted not more than 25 percent without treatment, but 75 to 100 

 percent after treatment with indolebutyric acid (40 mg./L, 24 hr.) (60). 

 Indoleacetic acid is also eflfective (87), and a treatment of lilac cuttings 

 with naphthaleneacetic acid (20 mg./L, 24 hr.) was highly beneficial (47). 

 Cuttings of the variety Mme. Lemoine taken here in early July, too late 

 for best results, rooted 17 percent without treatment, 34 percent with 

 indolebutyric acid (25 mg./L, 22 hr.), 48 percent with naphthaleneacetic 

 acid similarly used, and 63 percent with naphthaleneacetic acid (100 mg./L, 

 5 hr.). 



Tamarix, taiitarisk. Softwood, summer, cuttings root readily in sand (106). 

 Untreated late June cuttings of T. odessana rooted 90 percent in 3 weeks (57) 

 and similar cuttings of 7". pentandra rooted about equally well (66). 



Taxus, yew. Cuttings of Japanese yew rooted best when taken in Decem- 

 ber (13), December and January (31), or January (103), but cuttings of 

 this and other yews also root well when taken in October and November. 

 August cuttings will root in a cold frame but more slowly than do fall 

 cuttings in a greenhouse (123, 125). The basal cut is made at the base of 

 a year's growth, usually that of the current year, but it can be lower. 

 Cuttings of Canada yew rooted practically equally well when they had 

 wood one, two, or three years old at the base, but the latter types result 

 more quickly in larger plants (69). Cuttings have rooted well in sand- 

 peat (29, 57) ; better, in the case of T. media and Japanese yew, in sand (14, 

 21, 57). Cuttings of T. media taken here in November and December rooted 

 better in sand-peat than in sandy soil whether or not they were treated. 

 Bottom heat, 68° to 70° F., improved the rooting of cuttings of that 

 species (31). 



Rooting of untreated cuttings of yews is generally slow but sure and 

 the commonest eflfect of treatments is to hasten rooting. Cuttings in the 

 first stages of dormancy are benefited by higher concentrations than are 

 those taken later (57). Cuttings of three species responded to treatment 

 with indolebutyric acid (40 or 80 mg./L, 24 hr., or 12 mg./gm. talc) (61). 

 Cuttings of a variety of English yew which were taken here in early 

 December rooted 100 percent in 5 months without treatment, in 3 months 

 after treatment with indolebutyric acid (75 mg./L, 24 hr.). Cuttings of 

 T. media taken here in late January responded in the same way to treat- 

 ment with 50 mg./L, 24 hr. Indoleacetic acid (50 mg./L, 12 hr., or 100 

 mg./L, 16 hr.) also improved or hastened rooting of cuttings of yews 

 (21, 83), and naphthaleneacetic acid (40 mg./L, 24 hr.) was very eflfective 

 with fall and winter cuttings (47) — rather more eflfective in fact, than 

 indolebutyric acid (58). Naphthaleneacetic acid {2i2> mg./L, 24 hr.) also 

 hastened rooting of summer cuttings (113). 



Thuja, arbor-vitae. Cuttings are usually taken in fall and winter. There was 

 good rooting of cuttings of American arbor-vitae, made of the current 

 year's wood with a heel, which were taken here in every month from 

 November to March, but those taken in and after January rooted a little 

 more quickly. January cuttings of giant arbor-vitae also rooted well (123, 

 ^25). August cuttings of American arbor-vitae (var. robusta), in a cold 



