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 2 Effects of residual herbicide activity on survival and biomass o f broom seedlings

*Treatment*	*Survival*						*Relative biomass*
	*113 DAT*		*211 DAT*		*253 DAT*		*113 DAT*		*211 DAT*		*253 DAT*
Group 1: most persistent
tric/pic	0.0	d	30.7	b	53.0	a	0.0	c	13.9	b	14.5	b
hexa-H	0.0	d	71.2	ab	86.5	a	0.0	c	63.4	ab	72.8	a
Group 2: intermediate persistence
hexa-L	13.7	cd	90.5	a	93.2	a	7.2	bc	91.3	a	74.3	a
terbu/hexa	15.6	bcd	85.7	ab	83.3	a	17.2	bc	64.4	ab	59.1	a
clopyr-H	39.3	abcd	71.2	ab	86.7	a	36.8	abc	51.7	ab	65.2	a
clopyr-L	54.3	abcd	90.5	a	86.0	a	31.1	abc	92.5	a	83.1	a
terbu-H	65.2	abc	95.2	a	93.3	a	42.4	abc	67.2	ab	78.7	a
Group 3: least persistent
terbu-L	77.9	ab	71.7	ab	86.5	a	71.2	ab	77.6	a	91.7	a
triclo	79.7	a	88.1	a	88.9	a	49.7	abc	93.3	a	80.9	a
metsul-L	81.0	a	88.1	a	97.6	a	85.7	a	90.8	a	91.2	a
metsul-H	85.7	a	81.0	ab	85.9	a	68.9	ab	89.2	a	76.9	a
Significance of one-way ANOVA (F _10,32)
Treatment	7.48^***		2.68^*		1.50^ns		5.43^***		4.51^**		6.41^***

Data are expressed as a percentage of mean untreated control 113, 211 and 253 days after treatment (DAT). Treatments are sorted in an increasing order of survival for 113 DAT. Means within each column followed by the same letter are not significantly different at α = 0.05. For the analysis of variance (ANOVA), F-values are shown, followed by the P-category. Values with one, two and three asterisks are significant at P <0.05, 0.01 and 0.001, respectively and ^nsdenotes no significance at P ≥ 0.05.