What term describes a material containing a disease-producing organism or its spores?

What term describes a material containing a disease-producing organism or its spores?

• A. Inoculum
• B. Sign
• C. Life Cycle
• D. Ligule

Answer: (A)

Inoculum is the material that contains the disease-producing organism or its spores and is used to start an infection. In plant pathology and turf disease management, this can be fungal spores, bacterial cells, or virus particles kept viable to initiate disease in a host plant or to test susceptibility under controlled conditions. The key idea is that inoculum is about the infectious material itself, not the outward evidence of disease or the pathogen’s life stages. That’s why it fits best here: a sign is evidence of disease (such as a visible symptom), the life cycle refers to the pathogen’s developmental stages, and a ligule is a grass leaf structure, none of which describe the infectious material needed to cause disease.

Inoculum is the material that contains the disease-producing organism or its spores and is used to start an infection. In plant pathology and turf disease management, this can be fungal spores, bacterial cells, or virus particles kept viable to initiate disease in a host plant or to test susceptibility under controlled conditions. The key idea is that inoculum is about the infectious material itself, not the outward evidence of disease or the pathogen’s life stages.

That’s why it fits best here: a sign is evidence of disease (such as a visible symptom), the life cycle refers to the pathogen’s developmental stages, and a ligule is a grass leaf structure, none of which describe the infectious material needed to cause disease.