Abstract
Repeated use of a herbicide or herbicides with the same mode of action on a particular crop over a number of years may cause the selection of herbicide resistant weed populations. As a result effective weed control is lost which can seriously affect crop yield and quality. The selection of herbicide resistant weed populations is a concern not only for crop-growers, but also the manufacturers of the affected herbicides. In the present paper a two-step procedure is developed to identify the herbicide resistant activity in a particular crop growing region by estimating the resistant areas (in acres/hectares) in a given year of herbicide continued treatment along with percent risk of detecting herbicide resistance. A computer aided treatment area dynamics model (TADM) for estimating resistant areas, and a multistage model for estimating risk of herbicide resistance are discussed. An example is presented at the end to illustrate the two-step procedure.
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