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Two SDHI applications shows significant yield response, according to trials

Using an SDHI fungicide at T1 and another at T2 can boost yields by almost half a tonne, according to trials at NIAB TAG’s member farms.

Reviewing five years’ worth of data, comparing yield response to zero, one and two applications of SDHIs, Bill Clark, technical director at NIAB, says he found the results quite compelling.

 

“The average yield response for using two SDHIs over no SDHIs over all of those trials was 0.74 tonnes per hectare. Two applications versus one application was almost half a tonne per hectare, and one application versus no application was quarter of a tonne. There was never a case where it was worthwhile, on average, not to use SDHIs.”

Looking ahead to life without chlorothalonil (CTL), Mr Clark says: “If you imagine you are growing Santiago and there is a septoria epidemic and you are going to only use one SDHI, you would put it on the flag leaf, which is the most important spray.”

 

Without an SDHI at T1, the only other option, without the use of CTL, is a triazole, which has largely lost its eradicant activity, says Mr Clark.

“If you do not use an SDHI at T1 the septoria epidemic will get away from you, and by the time you come to flag leaf stage, you will need an even higher dose of an SDHI.

 

“Whereas if you use two SDHIs, even at lower doses, you can put one on at T1, which will keep the epidemic under control, meaning when you go in with your flag leaf spray you can use a lower dose of an SDHI.”

 

This will not only cost less but it is also the less selective treatment in terms of fungicide resistance, says Mr Clark.


Mean yield responses t/ha to fungicide treatments 2012-2016. Source: NIAB TAG.

 

2 SDHIs vs 0 SDHIs

2 SDHIs vs 1 SDHI

1 SDHI vs no SDHI

All years

0.74

0.46

0.20

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