Capeweed reduces crop yield

Page last updated: Thursday, 25 March 2021 - 11:06am

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Integrated weed management

There are many tactics that could be considered when developing an integrated plan to manage capeweed. These include: herbicide tolerant crops; inversion ploughing; delayed sowing; pasture spray-topping; using herbicides and more.

Table 1 Tactics that should be considered when developing an integrated plan to manage capeweed (Arctotheca calendula)
Tactic name Most likely % control (range) Comments on use
Herbicide tolerant crops 90 (80–95) Good control can be achieved in triazine-, imidazolinone- and glyphosate-tolerant crops
Inversion ploughing 90 (50–98) Use skimmers to ensure deep burial of seed. Not suitable for some soil types
Delayed sowing 60 (50–90) Works best on undisturbed paddocks
Fallow and pre-sowing cultivation 60 (20–95) Requires drying conditions following cultivation. Transplants are common in wet conditions. Burial of seed will lead to dormancy
Knockdown (non-selective) herbicides for fallow and pre-sowing control 80 (70–99) Good control of actively growing unstressed weeds. Poor control of early germinated weeds that have lost leaves due to early season drought
Double knockdown or ‘double knock’ 90 (80–99) Better control of hard to kill plants and those in dense infestations
Pre-emergent herbicides 75 (70–85) Diuron and picloram provide good control
Selective post-emergent herbicides 90 (80–99) Clopyralid provides good control, especially of hard to kill plants. Limited control options in leguminous crops. Spray grazing is good for pastures
Pasture spray-topping 70 (30–90) Graze heavily in winter to ensure uniform flower emergence. Graze or respray survivors
Renovation crops and pastures – green manuring, brown manuring, mulching and hay freezing 90 (80–99) Graze heavily in winter to ensure uniform flower emergence. Graze or respray survivors
Grazing – actively managing weeds in pastures 50 (30–80) Rotationally graze pastures and use spray-grazing with MCPA or 2,4-D if necessary in clover based pastures. Flumetsulam plus diuron provides reasonable control in many other legume based pastures

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