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Powering up disease control at T3 with prothioconazole

With unsettled weather continuing to favour disease development, attention turns to protecting the ear. As such, the T3 fungicide timing will be key to protecting crops from ear diseases such as fusarium spp. and microdochium. This treatment timing also provides a good opportunity to provide top-up protection against foliar diseases such as septoria and rusts.

Prothioconazole is an ideal option at the T3 timing in wheat, barley, rye and oats as it offers good activity against a range of diseases including septoria, rusts, mildew and fusarium. It also offers good control of light leaf spot, phoma, stem canker and sclerotinia in oilseed rape.

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However, not all brands­ of prothioconazole are created equally, with some formulations offering better crop protection than others.

Thanks to ADAMA’s unique AsorbitalTM formulation technology, products such as SORATEL (250 g/L prothioconazole) and MAGAN (250 g/L prothioconazole) deliver better control of key diseases compared to the current market-leading prothioconazole brand.

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Asorbital formulation technology

AsorbitalTM formulation technology takes the performance of prothioconazole fungicides to the next level: with an inbuilt adjuvant which enhances leaf uptake, and a special solvent system which ensures the active ingredient reaches and protects every part of the leaf, ADAMA’s unique formulation consistently outperforms standard generic prothioconazole fungicides.

AsorbitalTM fungicides also boast improved levels of rainfastness, so crops remain protected for longer.

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Independently proven benefits

Independent laboratory trials have shown that SORATEL and MAGAN provide improved control of fusarium ear blight and better control of septoria, rusts and mildew compared to the market leading prothioconazole product. This is due to ADAMA’s AsorbitalTM formulation which makes uptake into the plant quicker and more effective.

In the trial, a standardised amount of the test products was applied to the basal part of wheat leaves, with the apical part of the leaves left untreated. The apical part was then removed, and the basal part washed to remove any remaining active ingredient on the leaf surface. Both parts were then inoculated with septoria and incubated under saturated, humid conditions. Septoria lesion lengths were then assessed at 21- and 28-days post inoculation, with the results reflecting the quantity of active ingredient present in each part of the leaf: less disease in the basal part indicated better penetration into the leaf; less disease in the apical part indicated better migration from the basal part to the apical part.

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ADAMA’s AsorbitalTM formulation is taken up more quickly than the market leading prothioconazole product, resulting in better protection against septoria.

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ADAMA’s AsorbitalTM formulation also offers better protection against septoria in non-treated leaf areas thanks to its superior movement within the leaf.

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Longer lasting protection

Laboratory trials have also shown that the AsorbitalTM formulation offers better rainfastness than the market leading prothioconazole product.

In this trial, wheat plants were treated at the 2-3 leaf stage and subjected to 40mm of simulated rainfall at 1 or 3 hours after treatment. The plants were inoculated with septoria 24 hours later, and disease levels assessed after 21 days. In both cases, the AsorbitalTM formulation achieved better control of septoria compared to the market leading product.

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Enhanced fusarium control

In a trial carried out by ADAS in 2022 and 2023, SORATEL (250 g/L prothioconazole) was shown to outperform the market leading prothioconazole product both in terms of fusarium head blight control and reducing mycotoxin (DON) levels in grain.

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Two straight prothioconazole products, one unique formulation

ADAMA’s unique AsorbitalTM formulation is available in two straight prothioconazole fungicides, both of which can be used at the T3 timing in wheat.


Active ingredient: 250 g/l prothioconazole                 

Formulation: emulsifiable concentrate                            

Crops: cereals and oilseed rape  

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Active ingredient: 250 g/l prothioconazole

Formulation: emulsifiable concentrate

Crops: cereals and oilseed rape

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Crop Diseases controlled
Wheat Eyespot, septoria (leaf and glume blotch), powdery mildew, yellow rust, brown rust*, tan spot*, ear disease complex – fusarium ear blight* (reduction of deoxynivalenol) and reduction of sooty moulds
Barley Eyespot, powdery mildew, yellow rust, brown rust, ear disease complex – fusarium ear blight* and reduction of sooty moulds, rhynchosporium and net blotch
Rye Eyespot, powdery mildew, brown rust and rhynchosporium
Oats Eyespot, crown rust and mildew
Winter OSR Light leaf spot*, phoma leaf spot, stem canker, sclerotinia stem rot

(* provides moderate control)

Doses and application timings

Crop Max individual dose (l/ha) Max total dose (l/ha) Latest application timing

Winter & spring wheat

Winter rye

0.8 2.4 Before milky grain ripe stage (GS 70)

Winter & spring barley

Winter and spring oats

0.8 1.6 Before beginning of flowering (GS 61)
Winter oilseed rape 0.7 1.4 Full flowering (BBCH 65) (PHI 56 days)

More information

For more information about how our AsorbitalTM technology could power up your disease control programme, click on the product images above or speak to one of our agronomy experts by calling the ADAMA technical helpline on 01635 876 622.