Selective Herbicides for Cultivation of Eucalyptus urograndis Clones

Table 6

Survival and stem volume index of Eucalyptus urograndis trees at the end of the first growing season for preemergence (PRE) or postemergence (POST) applications of various herbicides, in comparison to a nontreated control and complete weed control obtained with repeated foliar sprays of glyphosate herbicide, directed carefully to weeds.

Treatment	Rate (g ha^−1)	Survival^1		Stem volume index^1,2
		(%)		(cm^3)
		PRE	POST	PRE	POST
Flumioxazin	290 ai	100 a	100 a	157 bc	46 c–e
Flumioxazin	430 ai	100 a	100 a	226 bc	55 c–e
Imazamox^3	140 ae	100 a	100 a	200 bc	315 b
Imazamox^3	280 ae	100 a	100 a	91 cd	116 c
Imazapic^3	140 ae	64 b	100 a	41 de	55 c–e
Imazapic^3	210 ae	63 b	100 a	22 e	56 c–e
Oxyfluorfen	1120 ai	100 a	100 a	173 bc	91 cd
Oxyfluorfen	2240 ai	100 a	100 a	403 b	65 c–e
Sulfometuron	26 ai	100 a	100 a	175 bc	47 c–e
Sulfometuron	53 ai	100 a	100 a	276 b	26 e
Sulfometuron	105 ai	100 a	100 a	348 b	65 c–e
Nontreated control		100 a	100 a	42 de	42 de
Complete weed control		100 a	100 a	2665 a	2665 a

LS-means within a column followed by the same letter are not significantly different at = 0.05 using Fisher’s protected LSD. Means are for the two E. urograndis clones combined since clone effects were not significant.
²Stem volume index (SVI) = ; GLD₅ = outside bark stem diameter 5 cm above the ground; = live stem height.
³A nonionic surfactant at 0.25% (v/v) was added for POST applications of imazapic and imazamox as directed by the herbicide label.