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The cutting depth required to control calotrope (Calotropis procera) plants using mechanical techniques

Campbell, S., Roden, L., O'Donnell, C. and Perkins, M. (2020) The cutting depth required to control calotrope (Calotropis procera) plants using mechanical techniques. The Rangeland Journal, 42 (2). pp. 129-134.

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Article Link(s): https://doi.org/10.1071/RJ20035

Publisher URL: https://www.publish.csiro.au/paper/RJ20035

Abstract

Calotrope (Calotropis procera (Aiton) W.T. Aiton) is an exotic woody weed that has invaded northern Australia’s rangelands since being introduced in the early 1900s. To expand the range of control options beyond herbicide-based methods, we undertook a stem/root cutting experiment that helped quantify the potential for using mechanical control techniques. Individual, medium-sized (1.72 ± 0.03 m high) calotrope plants were cut off at ground level (0 cm) or below ground (10 or 20 cm) using either a pruning saw or mattock respectively. All calotrope plants cut at ground level reshot vigorously. After four months they had more than twice the number of stems (7.4 ± 0.54) of the uncut control plants and by 12 months they were only 26 cm shorter than the control plants. In contrast, all plants cut at 10 or 20 cm below ground were killed. Some mortality also started occurring in the control and ground level (0 cm) treatments after eight months, but appeared to be associated with a dieback phenomenon. Nevertheless, the results demonstrate the potential to use equipment that severs the root system below ground, such as blade ploughs and cutter bars. A subsequent stick raking demonstration achieved moderate plant mortality (72%) after 13 months, yet produced a six-fold increase in original plant density as a result of new seedling emergence. This finding supports the view that mechanical disturbance will often promote seedling recruitment, and land managers need to have the capacity to undertake follow-up control practices to avoid exacerbating the problem.

Item Type:Article
Business groups:Biosecurity Queensland
Keywords:invasive species, rangeland management, rubber bush, woody weed.
Subjects:Science > Invasive Species > Plants
Science > Invasive Species > Plants > Weed ecology
Agriculture > Agriculture (General) > Farm machinery and farm engineering
Plant pests and diseases > Weeds, parasitic plants etc
Animal culture > Rangelands. Range management. Grazing
Deposited On:01 Sep 2020 03:45
Last Modified:01 Sep 2020 03:49

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