Fungicide resistance evolves in a similar way to herbicide resistance but can be more difficult to assess given uneven disease transmission across fields, reduced disease incidence in dry years, and the fact that some legume diseases complete multiple life cycles in a single year.
Bethany Wyatt, senior technical services specialist at BASF, said Group 11 resistance is not new: resistance to Ascochyta in chickpea and anthracnose in lentil was identified in the early 2000s, and resistance to Mycosphaerella blight in pea was identified in 2008.
Drought conditions have suppressed many of the common legume diseases over the past few years, but with moisture now restored to much of the legume growing region, disease management will be a priority this season.
Farmers need to be able to assess whether the diseases they are dealing with are Group 11 resistant and how to manage these pathogens through longer crop rotations, rotating modes of action, especially when applying multiple times in a season, and using multiple effective modes of action in tank mixes.
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