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17 March 2017 - by Andrew Bailey - Cereals Fungicide Technical Specialist
2 min

2017 - How to manage Septoria disease and resistance

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While field performance from SDHIs is anticipated to remain effective in 2017, strong stewardship is needed to prevent a rapid increase in the frequency of resistant isolates in the wider Septoria population. 

All fungicide programmes used on wheat and barley must therefore adhere to the following guidelines for resistance management:

  • Limit the number of applications to two SDHIs in one crop
  • Always use SDHIs in combination with at least one fungicide with an alternative mode of action
  • Tank-mixing two SDHI fungicides is not an anti-resistance strategy. In any tank-mix, the SDHI should be applied in a balanced mixture with at least one other, different fungicide.

Multi-site fungicides, such as the folpet family, are the ideal partner products for SDHIs: by affecting a number of different metabolic sites within the pathogen multi-site actives provide a good preventative effect against Septoria, which also makes them less susceptible to resistant mutations.

Folpet has also been shown to extend the life expectancy of high risk fungicides: modelling studies by ADAS and Rothamsted Research found the inclusion of folpet would have doubled the life expectancy of high risk fungicides. In the case of epoxiconazole, the numbers of years for which the fungicide is able to keep the crop canopy healthy when used in a variable dose tank mix strategy increased from 8 to 16 years. For the strobilurin family of fungicides this lifespan increased from four to eight years.

This work was further supported in 2014 by field trials carried out by Irish research body, Teagasc, where the inclusion of folpet with full-rate epoxiconazole at two timings (GS 31 and 39) reduced the number of insensitive septoria strains compared with straight epoxiconazole. This shows that folpet has the ability to reinforce the protective effect of azoles and to reduce selection pressure.

Folpet also increases the uptake of partner products: Silsoe spray trials showed that only 45% of the epoxiconazole applied with chlorothalonil had been taken up by wheat plants 10 hours after application, compared with 55% in an epoxiconazole and folpet mix. After 25 hours the gap was more pronounced, at 45% and 70% uptake respectively.

With their ability to maximise crop protection and to prolong the lifespan of the current armoury of SDHIs, multi-site fungicides should therefore be used as the backbone to an effective septoria control and resistance management strategy.

Folpet Fungicides

Arizona: a unique multi-site protectant fungicide containing straight folpet for providing an anti-resitance strategy for the control of Septoria and a range of other cereal diseases in wheat and barley.

Manitoba: a unique combination of the anti-resistance component, folpet, plus a leading azole, epoxiconazole, offering broad spectrum flexible disease control for cereal crops.
Click here to view Arizona product page

Andrew Bailey - Cereals Fungicide Technical Specialist
Andrew Bailey - Cereals Fungicide Technical Specialist
One of the UK arable sector’s most experienced fungicide specialists. With a background in applied biology (specialising in crop science and plant pathology), and with a career spanning 30 years in field based research, fungicide development and fungicide technical support, Andy has worked in the crop protection sector on a UK, European and global level.

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