Rhynchosporium secalis


In a Nutshell

    Chlorotic, irregular or diamond-shaped lesions spread on older leavesThe centers of the lesions dry out and bleach while the margins turn brownLesions enlarge and coalesce to cover large areas of the leaf

Hosts: %1$s

· Rye · Barley


Rhynchosporium infection is characterized by distinctive lesions forming on coleoptiles, leaves, leaf sheaths, glumes, floral bracts, and awns (hair-like appendages that stick out of the florets). Symptoms first appear as chlorotic, irregular or diamond-shaped lesions (1-2 cm) on the lamina or axils of the older leaves. Then, the lesions typically turn grayish with a watery appearance. Later, the centers of the lesions dry out and bleach, turning light gray, tan, or white. Their edges turn dark brown and can be surrounded with a yellow chlorotic halo. As they enlarge, the lesions merge and become oval to oblong, not limited by leaf veins. Younger leaves and inflorescences can also get infected in case of severe infection or at later stages. Floral infections are characterized by lesions with light tan centers and dark brown margins near the base of the awn.


Rhynchosporium is a seed-borne fungus, which can also survive on infected host residues like plant debris or volunteer plants for up to one year. The spores are spread over short distances by rain splashes and to a lesser extent by the wind. Spore formation and infection can occur at temperatures between 5°C and 30°C. The favored environmental conditions are temperatures between 15°C and 20°C and 7 to 10 hours of leaf wetness. The symptoms appear first and are more severe at higher temperatures. If the flag leaf and the two leaves directly underneath are affected, yield reduction is the consequence. If there is a latent infection (symptomless), the pathogen can survive in plant debris from season to season.

Biological Control

Sorry, we don't know of any alternative treatment against Rhynchosporium secalis . Please get in touch with us in case you know of something that might help to fight this disease. Looking forward to hearing from you.

Chemical Control

Always consider an integrated pest management including preventive measures together with biological treatments if available. Treatment of seeds with fungicides can be helpful to decrease the probability for an early season epidemic. Use fungicide mixtures with different modes of action from the strobilurin and anilinopyrimidine group.

Preventive Measures

    Use tolerant varieties available in your areaLate sowing of winter barley and winter ryeControl of weeds in and around the fieldCheck the plants or fields for any sign of disease when favorable conditions for the fungus are givenRotate with non-host cropsPlow deep to bury plant residues under the surface


Regional Weather

Get detailed forecast and actual weather data.

Plantix offers detailed weather information on the following issues:



Air Pressure


Wind speed

Plantix Community

Get in touch with experts around the world.

Post your questions

You can post your questions and pictures and get feedback from other farmers or gardeners. Plantix' experts will answer your questions related to plant diseases and pests.


Exchange with Plantix users around you, in your language and related to the crops you grow.

Global Community

Connect to farmers, gardeners, experts and interested people around the world that discuss plant diseases, remedies and best practice for sustainable farming.

AI-Driven Disease Detection

Instant diagnostics and solutions based on your picture

Image Recognition

Plantix analyzes your picture within a few seconds and gives you instant feedback on your plant problem.

Customized Management Options

On top of the detection result, Plantix offers you a detailed description of possible solutions - both biological and conventional.

Preventive measures

Plantix offers information on preventive measures to protect your crop from the next attack.