Weather conditions across the country have been mixed, but generally favourable overall.
Following a fairly dry early spring period in many areas, levels of septoria and rust remain relatively low to moderate in many crops; however, recent rainfall in some areas has increased risk levels with disease development and pressure likely to respond quickly at this time of year.
Septoria spores on lower leaves are easily transferred higher up the canopy in rainfall events so it is something we need to look out for with the potential for some rain this week.
• Growers will need to be well prepared for all situations to protect crops adequately by assessing crops carefully.
• NIAB trials work indicates 67% of fungicide response is delivered at the T2 timing (GS 37 - 39). The flag leaf contributes to 40-45% of yield alone, so keeping both leaf 2 and the flag leaf clean from septoria and rusts is vital.
• Consider a combination of both single and multisite chemistry at T2 to keep crops protected for longer.
• Consider the strengths and weaknesses of products and how these can be balanced to optimise disease control and spend.
• Clayton Canyon SC (500 g/L folpet) is an ideal multisite to include in the T2 tank-mix to protect crops further towards maturity at this timing and for the bolstering effect it has on partner products
T2 DISEASE FOCUS
DISEASE FOCUS SEPTORIA
Septoria disease pressure will increase in many crops if isolated showers or rainfall events occur in the next few weeks, and septoria will be the key focus for T2 in many crops.
DISEASE FOCUS YELLOW & BROWN RUST
Yellow rust susceptible varieties or high-risk crops need careful attention at T2 (especially with the breakdown in resistance of the Yr15 gene). If earlier timings were not made or were less successful at reducing disease, then T2 programmes will benefit from addition of a strong yellow rust actives.
Brown rust has become increasingly important in susceptible varieties and laterdrilled crops in recent seasons.
DISEASE FOCUS FUSARIUM
Where fusarium is a concern, consider including prothioconazole to help slow disease development. Fusarium primarily thrives in warm and wet weather so if we get some more rain it will be worth protecting those susceptible crops, especially in fields with a history of it.
Image courtesy of AHDB
Image courtesy of AHDB
T2 PRODUCT OPTIONS
CLAYTON CANYON SC ™
ACTIVE INGREDIENTS
500 g/L folpet
T2 SUPPORT Using 1.0 L/ha will give strong septoria protection following T1 and as a multisite provides an important alternative mode of action.
FUNGICIDES
FORMULATION Suspension Concentrate (SC)
DISEASE STRENGTHS Strong protection against septoria
CLAYTON LIBRA ™, CLAYTON QUINTUS ™ NEW FOR 2026
ACTIVE INGREDIENTS
62.5 g/L fluxapyroxad + 45 g/L metconazole
T2 SUPPORT Using 1.0 L/ha will give strong allround disease activity, including septoria and rusts.
FORMULATION Emulsifiable Concentrate (EC)
DISEASE STRENGTHS Powerful systemic activity against septoria, rusts and eyespot.
CLAYTON NAVARO ™, CLAYTON PONTOON ™
ACTIVE INGREDIENTS
125 g/L prothioconazole + 125 g/L tebuconazole
T2 SUPPORT Using 0.55 L/ha will give strong all-round disease activity, including septoria and yellow rust.
CLAYTON TUSKAR ™
ACTIVE INGREDIENTS
250 g/L prothioconazole
T2 SUPPORT Using 0.55 L/ha will bolster activity against fusarium, help septoria eradicant activity and strengthen eyespot control.
FORMULATION Emulsifiable Concentrate (EC)
DISEASE STRENGTHS Strong all-round disease activity including septoria and yellow rust.
FORMULATION Emulsifiable Concentrate (EC)
DISEASE STRENGTHS Septoria: protectant + eradicant activity. Plus stem-based disease e.g. eyespot, mildew activity.
FUNGICIDES KEY T2 PRODUCT OPTIONS
CLAYTON AUGUSTA ™
ACTIVE INGREDIENTS
250 g/L azoxystrobin
T2 SUPPORT Where yellow rust pressure is high and persists after T1, consider using 0.4 L/ha at T2 in combination with other actives to improve knock-down activity on yellow rust.
FORMULATION Suspension Concentrate (SC)
DISEASE STRENGTHS Rust and take-all.
CLAYTON TEBUCON 250EW ™, CLAYTON TEBBIT ™
ACTIVE INGREDIENTS
SUGGESTED RATES
250 g/L tebuconazole
Using 0.4 L/ha at T2 with other newer chemistry will provide good knock-down activity on yellow rust and improved brown rust activity.
FORMULATION Emulsion (Oil in water) (EW)
DISEASE STRENGTHS Cost-effective rust activity.
CLAYTON FINCH ™, CLAYTON TRELLIS ™
ACTIVE INGREDIENTS
160 g/L prothioconazole + 80 g/L tebuconazole
T2 SUPPORT Using 0.5 L/ha will give strong allround disease activity, including septoria and rusts.
CLAYTON TENDRIL ™
ACTIVE INGREDIENTS
300 g/L spiroxamine + 160 g/L prothioconazole
T2 SUPPORT Using 0.5 L/ha will give widespectrum control of key disease targets including septoria, rusts, powdery mildew and eyespot.
