[Truncated] Modern cropping systems throughout the world are highly dependent on herbicides for weed control. Herbicide resistance threatens the sustainability of these cropping systems. Growers are being encouraged to adopt integrated weed management (IWM) practices that place less reliance on herbicides to delay, if not prevent, further resistance development. This study examines the factors influencing the adoption of IWM by Australian grain growers, and opportunities for extension to improve herbicide resistance management. In Australia, grain growers face one of the most challenging resistance problems, with the major weed, annual ryegrass, being most commonly affected. In a field survey conducted as part of this study, a majority of cropping fields in the Western Australian wheatbelt were found to contain a resistant population. However, resistance to all herbicides available for the in-crop control of ryegrass remains uncommon, suggesting that all growers still have the opportunity to conserve herbicide susceptibility. A framework for understanding the adoption of IWM practices was developed. Essentially grain growers are seen to be managing a potentially exhaustible resource, herbicide susceptibility, and to select the optimal level of exploitation of that resource over time.
|Qualification||Doctor of Philosophy|
|Publication status||Unpublished - 2002|