Weed Research (1993) 33, 345-353

F.D. Panetta and R.P. Randall (1993)
Herbicide performance and the control of Emex australis in an annual pasture
Weed Research 33 (4), 345-353
Abstract: Herbicides were applied annually for 3 years to a pasture population of Emex australis Steinh. Herbicide performance was highly variable, with significant effects on weed survival only in single seasons. In most cases, seed bank densities declined monotonically from an initial level of 1900 m⁻². Seed banks decreased after seasons when E. australis contributed less than 25% to pasture dry matter. The annual decay rate of the seed bank was estimated to be 70%. Owing to the unreliability of the herbicides when applied at rates low enough to protect pasture legumes, the potential for tactical chemical control of E. australis is limited. Furthermore, it is argued that the potential for strategic chemical control is low, since the species can tolerate periods of population decline. E. australis could be managed more effectively by maintaining high densities of annual grasses and legumes, against which it is a poor competitor.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Emex australis (weed)	Grasses/turf/rangeland	Australia (Western)