Rhizoctonia stem rot
- Rhizoctonia stem rot: brown lesions on young plants
Rarely causes problems under traditional dryland peanut production conditions in Australia. May be a problem under sprinkler irrigation where the soil surface stays cool and moist. Plants can be killed from seedlings to maturity.
Distinctly zonate brown sunken lesions which can completely girdle stems, causing part or all of the plant to die. Pegs and pods may also be affected.
The fungus is already present in many soils and can survive in soil for many years.
Applying gypsum may reduce pod rots. Avoid covering the crown and branches of the plant with soil during cultivation.
Rotate crops to increase or maintain levels of soil organic matter.
Chemical registrations and permits