Stunting, small leaves, and nutritional deficiency symptoms are associated with which type of disease?

• A. Root rot and root parasitic nematodes
• B. Leaf spot
• C. Rust
• D. Powdery mildew

Answer: (A)

When a plant shows stunting, small leaves, and symptoms that look like nutrient deficiencies, the clue is that the problem is rocking the root system and its ability to take up water and minerals. Root rot pathogens and root-parasitic nematodes attack and damage the roots themselves, which directly cuts off the plant’s access to nutrients. That makes the whole plant grow poorly and display those deficiency-like symptoms because nutrients aren’t being transported to the shoots.

Leaf spot, rust, and powdery mildew are mostly leaf or foliar issues. They produce spots, rust pustules, or powdery coatings on the leaves, and while they stress the plant, they don’t typically cause a systemic failure of nutrient uptake through damaged roots. So the symptoms described align most closely with problems in the root zone, not with the leaf-focused diseases.