Australian Herbicide Resistance Initiative
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Blog: AHRI insight
When does a seed become a seed?

Tue, 26 Sep 2017

When does a fracas become a melee? When does a cake become a soufflé? When does a wild radish seed become a viable seed, after which time spraying with a crop topping herbicide becomes futile? We know that for grass weeds we need to crop top or spray top sometime between flowering and milky dough of the grass seed (depending on the herbicide) to achieve high levels of control, but this timing is not well understood for broadleaf weeds such as wild radish. In the early 2000’s, Dr Aik Cheam from DAFWA did a great job of describing the critical wild…

Featured Publication
Publications How do spatial heterogeneity and dispersal in weed population models affect predictions of herbicide resistance evolution?

Fri, 8 Sep 2017

Weed population simulations can be useful to predict the effects of alternative management practices on herbicide resistance (HR) evolution. Almost all previous simulations have ignored the possibility ofwithin-field spatial structure in a weed population, instead making the implicit assumption of perfectdispersal and spatial homogeneity in population density and genetics. The effects of this simplifying assumption have not been examined, despite the fact that dispersal limitations and spatial structure within the population are likely to occur and to affect the evolution of resistance. Therefore, we developed a new spatially-explicit model called SOMER. Click through for more.

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