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Rhizoctonia spring blight

Area of impact: Roots and leaves

Description: Large, irregular lesions form on the dormant leaves of infected plants. If the plant is stressed or dormant following infection the disease can move into the crown, and the plant will die.

Pathogen involved: Rhizoctonia cerealis (a fungus)

Timing/Conditions: Late winter or early spring under wet conditions and when the temperature has been fluctuating.

Contributing factors: Heavy nitrogen application. The fungus oversummers in the soil.

Management practices: Use granular nitrogen application over light snow or wet frozen ground or split the applications.

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