Selective Herbicides for Cultivation of Eucalyptus urograndis Clones

Table 1

Herbicide treatments tested for selective weed control in Eucalyptus urograndis clonal plantation culture near Quincy, Florida, applied over the top of newly planted container-grown cuttings¹, either prior to weed emergence (PRE, two weeks after planting) or after weed emergence (POST, six weeks after planting), compared to a nontreated control and near complete weed control obtained using repeated glyphosate herbicide sprays, carefully directed to weeds while shielding seedlings from spray contact.

Treatment	Relative rate	Actual rate^2 (g ha^−1)	Trade name	Herbicide content
Flumioxazin	Low	290 ai	SureGuard	51%
Flumioxazin	High	430 ai	SureGuard	51%
Imazamox^3	Low	140 ae	Clearcast	120 g L^−1
Imazamox^3	High	280 ae	Clearcast	120 g L^−1
Imazapic^3	Low	140 ae	Plateau	240 g L^−1
Imazapic^3	High	210 ae	Plateau	240 g L^−1
Oxyfluorfen	Low	1120 ai	GoalTender	480 g L^−1
Oxyfluorfen	High	2240 ai	GoalTender	480 g L^−1
Sulfometuron methyl	Low	26 ai	Oust XP	75%
Sulfometuron methyl	Medium	53 ai	Oust XP	75%
Sulfometuron methyl	High	105 ai	Oust XP	75%
Nontreated control	—	—	—	—
Complete weed control	—	—	Accord XRT	—

Container grown rooted cuttings were sixteen weeks old at planting.
²Rate of active ingredient (ai) or acid equivalent (ae) applied.
³A nonionic surfactant was added at 0.25% (v/v) for POST applications of imazamox and imazapic as directed by the herbicide labels.