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MIRAVIS® Prime fungicide offers new solution for sclerotinia control


Sclerotinia may be more problematic over the coming months for potato growers, with higher-than-average rainfall prolonging wet soil conditions during the growing season. Sclerotinia is a soilborne fungal disease, so can be hard to control and often arises late in the season when stems are in contact with infected soil.

Sclerotinia produces black sclerotia that can survive in soil for up to ten years and infect new plantings. For this reason, the disease can be very difficult to control, especially under pivots with a history of disease.

The disease is more serious under milder temperatures (15–21°C) and prolonged wet weather conditions, particularly on susceptible varieties. Excessive irrigation or water-logged areas of the paddock are more susceptible to infection and dense crops favour infection due to poor air circulation.

Sclerotinia sclerotiorum have large black sclerotia (1–2 cm long) that can resemble rat dung at the base of the plant. Symptoms on stems include white fluffy mycelium and soft rot, which leads to stem and plant death. The fungus also has spores that can be spread by wind and in high humidity can even cause soft rot on higher leaves of the plant.

Growers now have a new solution with the introduction of MIRAVIS® Prime fungicide while still maintaining excellent target spot protection. MIRAVIS® Prime combines the powerful active ingredient pydiflumetofen (Group 7) with fludioxonil (Group 12), with both actives having powerful activity against sclerotinia.  MIRAVIS® Prime also delivers optimum protection against target spot (Alternaria solani) and botrytis, so provides an effective choice for disease defence in potatoes.

Pydiflumetofen works internally, moving very quickly into the waxy cuticle of the leaf and giving long lasting protection. Fludioxonil is a contact fungicide and protects the surface of the leaf. Having these two modes of action means MIRAVIS® Prime can attack fungi at multiple sites with the added benefit of resistance management.

A preventative fungicide program, together with cultural practices such as crop rotation and irrigation frequency, will provide the best protection against sclerotinia.  Up to two applications of MIRAVIS® Prime can be applied per season. Early foliar sprays inhibit the fungi entering the plant from the soil, while a later season application of MIRAVIS® Prime, post-flowering, stops the disease before symptoms appear.

Recent use of MIRAVIS® Prime in the Griffith region showed outstanding control of sclerotinia, even in high disease pressure situations. Target spot was also controlled, giving potato growers confidence of achieving full yield potential.


For more information contact your local Syngenta representative.




About Syngenta Australia
Syngenta is a leading agriculture company helping to improve global food security by enabling millions of farmers to make better use of available resources. Through world class science and innovative crop solutions, our 28,000 people in over 90 countries are working to transform how crops are grown. We are committed to rescuing land from degradation, enhancing biodiversity and revitalizing rural communities. To learn more visit and