• Fungi (Correct): Fungal pathogens are the most common cause of post-harvest rot in oranges, infecting the fruit during storage or through wounds in the rind.

Bacterium (Incorrect): While bacterial canker exists, it usually creates lesions rather than the soft, moldy rot typical of this disease, which is primarily caused by fungi.

Citrus (Incorrect): This is the type of plant, not the pathogen.

Mycoplasma (Incorrect): These are known for causing citrus greening (yellow shoot) rather than typical fruit rot.

──────────────────────────────────────────────────────────────────────────────────────────