Disease-Resistant Heirloom Tomatoes: What Resistance Really Means
Disease resistance is pathogen- and race-specific, not general immunity, and heirloom, open-pollinated, hybrid, resistant, and tolerant describe different traits. This guide explains common tomato resistance codes, how to verify the original claim, why a code may fail under field conditions, and how to select varieties from a confirmed disease history. It adds trial design, disease portfolios, sanitation, rotation, irrigation, recordkeeping, claim audits, and seed-saving limits.






















