Abstract
The contribution of colonizing and transient aphids to the primary and secondary spread of tobacco etch virus (TEV) in flue-cured tobacco was evaluated in North Carolina in 1985 and 1986. Transient aphids were apparently responsible for both primary and secondary spread of the virus. Aphid colonization had no effect on the distribution of TEV infections in tobacco, and insecticidal control of aphids had no effect on disease progress. Primary spread of TEV was responsible for the majority of infections early in the season (up to 8 wk after transplantation). Primary and secondary spread were both clustered about previously infected plants in the field early in the season. Toward the end of the season, new infections became randomly distributed with respect to previous infections in the field.
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