Keissleriella culmifida

The fungus Keissleriella culmifida is a specific ascomycete pathogen responsible for stem lesions in various cereal crops. It interferes with the structural integrity of the plant by colonizing the stem tissues and leaf sheaths, which leads to a decrease in nutrient transport and overall plant vitality.

The primary host range includes essential cereals such as wheat, barley, and rye. By targeting the internodes, the pathogen weakens the stalk base, significantly increasing the risk of lodging, which is particularly destructive during the grain-filling stage when the weight of the ears puts stress on the stems.

Visual symptoms often manifest as dark, brownish necrotic lesions on the stem surface. As the infection progresses, the diagnostic feature of this disease appears: small, black, dot-like fruiting bodies (pseudothecia) develop within the necrotic tissues, indicating that the fungus is preparing to release its spores.

Environmental conditions play a crucial role in the development and spread of Keissleriella culmifida. High humidity, frequent rainfall, and moderate temperatures are ideal for spore germination and infection. The pathogen relies on crop residues as a source of overwintering, making no-till systems potentially more vulnerable.

Prevention and control strategies focus on reducing the primary inoculum and managing the field environment. Cultural practices such as crop rotation and the complete incorporation of stubble into the soil are essential. When infection pressure is high, professional fungicide applications are recommended during the early growth stages of the cereal crop.

• Implementing diverse crop rotations to break the pathogen's life cycle.
• Deep plowing or mechanical incorporation of infected plant residues.
• Selecting resistant or tolerant cereal cultivars.
• Applying systemic fungicides at the early stages of stem elongation.