Earlier quoted context omitted.
For anyone not aware, the most proximate cause of the disappearance of "Florida Orange Juice™ " is the Candidatus Liberibacter asiaticus bacteria. Monoculture is often blamed, but the bacteria affects all citrus trees - oranges, limes, lemons, grapefruits, pomelos, etc.
According to the article, the reason why the bacteria was so quickly fatal for Florida orange trees is that their roots were weakened by a sequence of major hurricanes and by many years of excessive pesticide use.
A solution here could be growing a larger variety of produce, using organic farming practices, crop rotation, etc. Pests tend to specialize in specific things and most pests have natural predators. So, if you stop killing those they'll help keep outbreaks in check. And if you rotate crops, you take away the food source for the pests. And if you grown a variety of different things, it won't all get sick at the same time.