Abstract
Watermelon mosaic virus 1 (WMV-1) spread rapidly from Melothria pendula L., a week host, into spring-grown cucurbits in Collier County where infected M. pendula plants were concentrated close to plantings. WMV-1 infection increased from 0 to 88% in 4 weeks in a zucchini squash planting surrounded by infected M. pendula plants. At the same time, virus spread much slower in fields where external virus sources were limited, or where they were so situated that vectors did not encounter them before migrating over the crop planting. In one case, WMV-1 was transmitted from a high concentration of infected M. pendula plants to nearby watermelon by very low populations of flying aphids, but spread was limited to 125 ft.
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