Why is timely removal of diseased plants useful in agriculture?

Correct answer: To reduce spread of disease

The direct answer is A: timely removal of diseased plants reduces the spread of disease. A diseased plant may carry pathogens that move through insects, wind, water, tools, soil, or contact with nearby plants. The reasoning is: identify the abnormal plant early; remove it carefully without spreading infected material; dispose of it safely; clean tools and observe the remaining crop; use other recommended control measures if needed. A is correct because reducing the source of infection protects healthy plants and can reduce crop loss. B is wrong because removal is intended to protect, not reduce, crop quality. C is wrong because proper removal does not aim to poison soil; careless disposal or unsuitable chemicals could create a separate problem. D is wrong because it does not stop harvesting; it helps the crop reach harvest. Memory cue: early detection and sanitation break the disease chain.