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Fortunately,
leaf rust does not overwinter to a great extent in other parts of the state.
Even if leaves are infected in the fall, cold weather usually kills the leaves
and the leaf rust fungus living in them. In places where leaf rust does not
overwinter, spores must come from other areas in the spring, thus it has less
time to cause damage. Most of the spores arriving in Arkansas probably come from
Louisiana where leaf rust has a better chance of overwintering. Temperatures
around 70 F and heavy dew at night are favorable for rust development in the
spring.