Relative persistence of commonly used forestry herbicides for preventing the establishment of broom (Cytisus scoparius) seedlings in New Zealand plantations

New Zealand Journal of Forestry Science

Table 3 Estimated time (days) after herbicide application before broom seedlings reached 50 and 95% survival and 50 and 75% of biomass relative to untreated seedlings

*Treatment*	*Time to reach % survival (day)*				*Time to reach % relative biomass (day)*
*Treatment*	Ts ₅₀		Ts ₉₅		Tb ₅₀		Tb ₇₅
tric/pic	246	a	383	a	418	a	524	a
clopyr-H	180	abc	310	ab	243	b	316	ab
hexa-H	198	ab	246	abc	210	bcd	245	b
terbu/hexa	176	bcd	245	abc	228	bc	299	b
hexa-L	180	abc	207	bc	185	bcd	197	b
clopyr-L	122	cde	178	bc	131	bcd	169	b
terbu-H	107	de	167	bc	131	bcd	176	b
triclo	91	e	221	abc	100	cd	133	b
metsul-H	90	e	170	bc	94	d	132	b
terbu-L	83	e	116	c	98	cd	126	b
metsul-L	73	e	159	bc	87	d	118	b
Significance of one-way ANOVA (F _10,32)
Treatment	18.02^***		5.55^***		14.39^***		8.92^***

Treatments are sorted in a descending order of herbicide persistence, based both on Ts ₅₀ and Tb ₅₀. Means within each column followed by the same letter are not significantly different at α = 0.05. For the analysis of variance, F-values are shown, and values with three asterisks are significant at P < 0.001.