The Importance of Multi-sites

History clearly tells us that single-site fungicides used without the addition of a multi-site can quickly succumb to resistance evolution. With the loss of chlorothalonil we now turn to alternative methods and multi-sites such as folpet to manage resistance and extend the life of existing chemistry.

How do multi-sites work?

Multi-sites target multiple paths of the fungus development, such as spore germination, cell division and energy production in mitochondria.

Trials show that multi-sites improve disease control and can delay the development of resistance in other actives.

Watch our animation video to understand how important it is to include a multi-site in your fungicide spray programme.

Animation Multi-site Video

Now that CTL has gone...

Chlorothalonil, the multi-site fungicide, had been widely used for 50 years as an effective disease control method. As we learned more about disease resistance, it was more recently used alongside SDHI’s.

Now that its gone, it's just as important to protect current and newer chemistry from succumbing to resistance. Below we've summarised how you can continue to effectively protect your crop.

Chemistry Resistance in Barley

Over the recent year Ramularia has developed decreased senstitivity to several modes of action such as strobes and triazoles. This meant that CTL became the key ingrediant for Ramularia control. With the loss of CTL, controlling this disease becomes very challenging but there are several options to consider:

  • Manage stress in the crop with good nutrition programmes
  • Consider your variety and assess Ramularia pressure according to region and location 
  • Introduce multi-sites such as folpet into your spray programme
Ramularia: chemistry resistance

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