Following a relatively dry spring period, levels of Septoria and Rust currently remain low or moderate overall in many crops but that said, recent rainfall events in some areas have raised risk levels with disease development and pressure likely to respond very quickly at this time of year.
Also, 2024 was a relatively high-pressure year for key cereal diseases so inoculum levels will be high this season if weather conditions become more prevalent for diseases in the coming weeks, especially given the warm temperatures.
Growers will need to be well prepared for all situations in light of this to protect crops adequately.
EFFECTIVE T2 APPLICATIONS ARE CRITICAL FOR MAXIMISING CROP PERFORMANCE .
Long-term NIAB trials work indicates that 67% of fungicide response is delivered at the T2 timing and the flag leaf contributes to 40-45% of yield alone so keeping the flag leaf clean is vital.
OPTIMISING DISEASE CONTROL THROUGH TARGETED PRODUCT SELECTION.
Consider the strengths and weaknesses of key products and how these can be balanced to optimise disease control.
Clayton fungicides are ideal to bolster T2 programmes based on new chemistry or to provide robust cost-effective disease control options for crops with limited yield potential, or indeed for higher potential crops in low disease pressure situations.
MORE INFORMATION
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DISEASE FOCUS
SEPTORIA
Usually the key focus for T2. Septoria pressure will likely increase further 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 a lot of crops.
As well as utilising newer chemistry and actives such as benzovindiflupyr and isoflucypram, consider mixing modes of action for T2.
FUSARIUM
Where Fusarium is a problem, consider including prothioconazole in the T2 wheat programme, which can slow disease development.
Mefentrifluconazole applications at T2 will often benefit from the addition of prothioconazole to reduce Fusarium spreading higher up the canopy especially given recent wetter conditions.
YELLOW RUST & BROWN RUST.
Yellow rust susceptible varieties or high-risk crops need careful attention at T2, especially if earlier timings were not made or less successful at reducing disease, in which case T2 programmes will benefit from addition of a strong yellow rust active.
Brown rust has been a persistent problem in many crops too in recent seasons, so growers need to be vigilant to both rusts.
Image courtesy of AHDB
Image courtesy of AHDB
Find out more about Septoria
Find out more about Yellow Rust
Find out more about Fusarium
FUNGICIDES
WHEAT FUNGICIDE OPTIONS TO ‘BOLT ON’ TO NEW CHEMISTRY OR BOLSTER T2 PROGRAMMES:
CLAYTON CANYON SC ™
500g folpet
Using 1.0 L/ha will give strong Septoria protection following T1 and as a multisite provides an important alternative mode of action. Suggested rates: 1.0 L
CLAYTON NAVARO ™
125g prothioconazole + 125g tebuconazole
Using 0.55 L/ha will give strong all-round disease activity including Septoria and Yellow rust. Suggested rates: 0.55 L
CLAYTON TENDRIL™
60g prothioconazole + 300g spiroxamine
Using 0.5 L/ha will give wide-spectrum control of key disease targets including Septoria, Rusts, Powdery mildew and Eyespot. Suggested rates: 0.5 L
CLAYTON TUSKAR ™
250g prothioconazole
Using 0.55 L/ha will bolster activity against Fusarium, help Septoria eradicant activity and strengthen Eyespot control. Suggested rates: 0.55 L
CLAYTON TEBUCON 250EW ™
250g 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.
CLAYTON AUGUSTA™
250g azoxystrobin
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.
Suggested rates: 0.5 L
Suggested rates: 0.4 L (Rust) Information in this bulletin does not constitute a recommendation, it is for guidance only. Full information can be found on our website claytonpp.com. Brand names used in this update are trademarks of Clayton Plant Protection. Use fungicides safely. Always read the label and product information before use.
