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Septoria in cereals

Control strategy

Managing for the future

Septoria.

Septoria

in cereals...

Symptoms can be seen very early in the season. On autumn-sown wheat, water-soaked patches which quickly turn brown may be evident by early December on the lowest leaves.

Challenges.

to battle Septoria.

  • Understanding the shifts in triazole sensitivity; how do we make the most out of this input?
  • Strategies to control Septoria are frequently changing
  • Long term protection of SDHI and azole
  • Understanding varieties; resistance vs yield

We have hit a yield plateau and we are a long way from achieving the genetic potential of the wheat varieties available. How do we overcome this?

UK Wheat Yield.

A large proportion of current
fungicide strategies
are built on
Triazole chemistry and
rely on products with
eradicant
activity.

Control

strategy...

Fungicide programmes to date have relied on products with curative activity, all of which act on a single target site within the pathogen and are therefore vulnerable to resistance. With the decline in azole activity and continuing shift in septoria sensitivity, approaches need to change.

Fungicide Options.

Single Site Vs Multi Site.

Strobs, triazoles and SDHI's are all single site making them vulnerable. Multi-sites act on several sites within the pathogen.

SINGLE SITE CHEMISTRY acts on a specifc target site. It is not the same target site for all modes of action. Single site mixtures offer short term resistance management through effect disease control.

MULTI-SITE CHEMISTRY by definition acts on multiple sites within the pathogen. By using throughout the programme you minimise selection and thereby the risk of resistance developing. There are no known cases of resistance to multi-site chemistry.

Managing for

the future...

Multi-site protectant fungicides need to play an increasingly important role in robust fungicide programmes. It is essential to mix modes of action in order to minimise selection.

Chasing disease throughout the season is no longer sustainable. Strategies need to become more protectant by design, with greater emphasis given to earlier timings.

A 'prevention is better than cure' approach is required and should begin before fungicide decisions with variety choice and seed treatments.

Prevention Vs Cure.

  • Leaf 3 and 4 not vital in-terms of yield but both provide inoculum to infect leaf 1 and 2
  • Focus needs to move away from T2 and look to managing disease levels earlier in the season
  • Crops will already be infected at T0, important to take control early

Fungicides can affect the
infection rate, latent period and/or the infetious period of a sensitive strain.

Contribution to Yield.

Multi-sites have a low risk of resistance and should provide the backbone to any resistance management strategy!

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