Which disease control principle involves using plant genetic resistance to reduce disease?

• A. Resistance
• B. Exclusion
• C. Reduction
• D. Protection

Answer: (D)

Protection refers to shielding crops from disease through protective measures, and using plant genetic resistance is a direct way to do that. When a variety carries resistance genes, it can recognize the pathogen, slow or block its ability to infect, and limit how much disease develops. That protective effect reduces disease impact on the crop, which is why this principle fits best.

Think of it as a proactive shield: the goal is to keep disease from taking hold by strengthening the plant itself. Exclusion focuses on keeping pathogens out of the area, reduction aims to lower disease levels through various practices, and resistance describes the plant’s own defenses rather than the broader protective strategy. Using resistant varieties is a practical, durable way to protect crops, though it’s often best used in combination with other practices to maintain effectiveness over time.