Working Paper Article Version 1 This version is not peer-reviewed

Efficacy of Chemical Herbicides Using a Novel Encapsulated Delivery Mechanism for Mimosa Bush (Vachellia farnesiana) Control

Version 1 : Received: 20 September 2021 / Approved: 22 September 2021 / Online: 22 September 2021 (11:48:04 CEST)

How to cite: Limbongan, A.; Campbell, S.; Galea, V. Efficacy of Chemical Herbicides Using a Novel Encapsulated Delivery Mechanism for Mimosa Bush (Vachellia farnesiana) Control. Preprints 2021, 2021090380 Limbongan, A.; Campbell, S.; Galea, V. Efficacy of Chemical Herbicides Using a Novel Encapsulated Delivery Mechanism for Mimosa Bush (Vachellia farnesiana) Control. Preprints 2021, 2021090380

Abstract

Mimosa bush (Vachellia farnesiana) is an invasive woody weed widely distributed in Australia. While it can be controlled using several mechanical and chemical techniques, this study evaluated a novel new herbicide delivery mechanism that minimizes the risk of spray drift and potential non-target damage. It was developed by Bioherbicides Australia and involves the implantation of encapsulated granular herbicides into the stem of intact plants or into the stump after cutting off plants close to ground level (cut stumped). Trials were implemented near Moree (NSW, Australia) on intact (two trials) plants and cut stumped (two trials) plants. For each trial, an untreated control plus the conventional basal bark application of a liquid formulation of triclopyr/picloram mixed with diesel was included for comparison. Encapsulated glyphosate, aminopyralid/metsulfuron-methyl, hexazinone and clopyralid were also tested in all trials. In addition, triclopyr/picloram, and metsulfuron-methyl were included in at least one of the whole plant trials. Aminopyralid/metsulfuron-methyl was consistently most effective at controlling intact plants, whilst aminopyralid/metsulfuron-methyl and clopyralid provided highest mortality when applied to cut stumps of mimosa bush. Overall, highest efficacy was achieved on single stemmed plants, but with some further refinement of the technique it should be possible to achieve similar results for multi-stemmed species.

Keywords

mimosa bush; control; chemical herbicides; encapsulation; implantation

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