ADAMA advise cereal growers must use a diversity of active ingredients for long-term crop protection


With disease resistance continuing to erode the protectant activity of single site fungicides, cereal growers must use a diversity of active ingredients – including a multi-site – to ensure programmes offer effective long-term crop protection.

That’s the latest advice from ADAMA’s Fungicides Technical Specialist, Andy Bailey, who states that ARIZONA® (500g/L folpet) will be crucial this spring, not only to provide adequate disease control, but also to protect and prolong the efficacy of single site fungicides. 

2021 will be the first full year cereal growers have been without the protectant benefit of chlorothalonil, so it is important to build a robust programme on a field-by-field and variety-by-variety basis. As well as providing good disease protection, programmes should also safeguard fungicides against further erosion of efficacy. Mr Bailey therefore advises the inclusion of folpet – a multi-site inhibitor which FRAG UK (Fungicide Resistance Action Group) describes as a ‘valuable tool to manage resistance and provides added levels of disease control whilst protecting and prolonging the efficacy of at-risk chemistries’. 

Multi-site fungicides such as ARIZONA® (500g/L folpet) not only provide good control of diseases such as septoria, but also protect and prolong the efficacy of single site modes of action.

“ARIZONA® (500g/L folpet) provides valuable protection against septoria, rhynchosporium and ramularia, plus additional activity against rusts,” Andy explains. “In wheat, T1 remains the priority timing for including ARIZONA® in terms of septoria control, yield response and return on investment, but it is also flexible enough to be used at T0 and T2 in higher risk situations such as on susceptible varieties during periods of high disease pressure. 

The continuing development of resistance means barley diseases such as Rhynchosporium are now less sensitive to some single site fungicides.

“Likewise, ARIZONA® is the ideal protectant for barley where the key timing for controlling ramularia is T2. It can also be used at T1 (the key timing for rhynchosporium) or at T0 should the season dictate a need for early protection. To achieve effective control of both diseases a twospray programme should be considered.” 

Ramularia causes senescence once barley crops have flowered and can result in average yield losses of 0.6t/ha.

ARIZONA® (500g/L folpet) is a unique, cost-effective multisite protectant fungicide for the control of septoria in wheat and rhynchosporium in barley with additional activity against ramularia.

For more information or to receive an ARIZONA® technical pack containing a brochure, white board and pen go to Arizona Technical Pack (


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