Is there any evidence to suggest that creeping resistance is in fact widespread in Australia?
At present we have NO evidence that creeping resistance to herbicides occurs in Australia. Nearly all of the populations of weeds that we have studied in Australia demonstrate resistance inherited as single genes. The only cases where this is not so are examples where two different mechanisms give resistance to the same herbicide. For example, some annual ryegrass populations resistant to diclofop-methyl contain both insensitive target enzymes and enhanced herbicide metabolism mechanisms. Each of these mechanisms is governed by a single gene making a total of two genes for resistance. Both genes are incompletely dominant and, as far as we know, unlinked. There is no way that these populations could have been selected by ‘creeping resistance’. The enhanced metabolism mechanism gives 20-fold resistance and the target site a further 10-fold. The normal rate, or even double the normal rate, would have selected for both types of resistance. It has been speculated that the glyphosate resista
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