What to observe

• Stem constriction or water-soaked tissue near the media line
• Seedlings that fail before or shortly after emergence
• Root discoloration or decay
• Clusters associated with wet media, poor airflow, contaminated materials, or propagation trays

Common look-alikes

• Physical stem damage
• Severe overwatering without confirmed pathogen
• Desiccation after emergence
• Temperature injury
• Nutrient or salt injury to very young roots

Evidence that improves confirmation

• Inspect stem/root tissue and compare affected with healthy seedlings
• Document propagation moisture, temperature, sanitation, and emergence timing
• Use a plant diagnostic laboratory when identification of the causal organism matters

Risk context

• Very young plants have limited reserves and small root systems
• Saturated media and poor sanitation can increase disease risk
• Contaminated trays, tools, water, or media can contribute to repeated outbreaks

Management principles

• Use clean propagation materials and tools
• Avoid chronically saturated media and maintain appropriate aeration
• Remove collapsed seedlings according to sanitation practice
• Use lawful, crop-appropriate disease management only when the target and context justify it

Keep the conclusion proportional to the evidence

Use a confirmed identification when available. When evidence is incomplete, label the conclusion as a suspicion or differential rather than presenting it as proven.

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