Written by cpm
As chlorothalonil drops out of the picture, genetics may be stepping in to take its place on septoria control. CPM assesses what the transition means for growers. Chemistry can no longer be relied on solely to do the job, and increasingly genetics are stepping up to the plate. By Tom Allen-Stevens If you’re looking for chemistry to replace chlorothalonil and have been drawn into this article by its headline, prepare to be disappointed. Well, perhaps half disappointed, depending on how broad your expectations are. CTL is being withdrawn from use and after 20 May this year, you’ll no longer be able to apply it. That’s set to put a hole in fungicide programmes just as septoria in particular is getting tougher to control – CTL is the multisite fungicide widely viewed as the best current tank-mix partner, both to protect newer, more effective single-site chemistry and keep a lid on resistant strains of the disease developing. And just to clarify, there’s no new chemical multisite that’s about to replace it. So how do you put together a septoria control strategy that’s fit for the future? “We’re going through a transition period,” says John Miles of KWS. “Chemistry can…
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