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14 October 2020 Comparison of aminocyclopyrachlor to standard herbicides for basal stem treatment of Eucalyptus benthamii
Patrick J. Minogue, Kimberly A. Lorentz
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Eucalyptus species are grown for fiber, fuel, and other uses on more than 17.8 million ha worldwide, yet some species are considered invasive and may have adverse environmental or social impacts outside their native range. Aminocyclopyrachlor (AMCP) and standard applications of imazapyr and triclopyr herbicides were compared for eucalyptus control using a basal stem application method. At 6 and 12 mo after treatment (MAT), basal stem applications using 5% (vol/vol) AMCP (120 g ae L–1) in methylated soybean oil (MSO) resulted in 97% to 99% eucalyptus crown reduction and generally provided greater control across all diameter classes than standard treatments of 28% imazapyr (240 g ae L–1) or 75% triclopyr ester (480 g ae L–1). AMCP at 5% was as effective as 40% vol/vol. Increases in stem live height at 24 MAT suggest that the effect of triclopyr ester basal stem treatment may be impermanent. AMCP treated trees did not have regrowth by 24 MAT.

Nomenclature: Aminocyclopyrachlor; imazapyr; triclopyr; Camden white gum; Nepean River gum; Eucalyptus benthamii Maiden et Cambage

© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America.
Patrick J. Minogue and Kimberly A. Lorentz "Comparison of aminocyclopyrachlor to standard herbicides for basal stem treatment of Eucalyptus benthamii," Weed Technology 35(2), 304-308, (14 October 2020).
Received: 4 March 2020; Accepted: 5 October 2020; Published: 14 October 2020
crown reduction
methylated seed oil
stem dieback
Synthetic auxin herbicides
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