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In short, from the FAQ page --

Why do citrus trees within 1,900 feet of a citrus canker infested tree have to be destroyed?

The 1,900 feet distance was determined from a specific research study conducted by experienced plant pathologists under the weather conditions in South Florida. Over 15,000 trees were identified and monitored for evidence of citrus canker disease. From this research, they determined that approximately 95% of the exposed trees that became diseased were up to 1,900 feet away from a single disease-positive tree.

It was further found that the previously used distance of 125 feet for exposed trees captured only 20% of the trees likely to be infected by the disease from a disease-positive tree. Using 125 feet to determine what exposed trees to remove meant that up to 80% of the trees not yet showing canker symptoms were being left to further spread the disease.,