Abstract
The effect of tobacco etch virus (TEV) infection on flue-cured tobacco ( Nicotiana tabacum L.) plant growth was invisaged under field conditions in 1985 and 1986. Natural field infection of TEV was allowed to develop a patchy distribution of healthy plants and plants infected at various times of the season. Plants showing symptoms of TEV infection early in the season had significantly less leaf area by season's end (2 weeks after topping) than healthy plants or plants infected late in the season. Significant stunting was evident in plants first showing symptoms as late as 7 weeks after transplantation. Harvestable green leaf weight was not correlated with time of first TEV symptom expression. However, leaf weight per unit area was significantly correlated with time of plant infections, with earlier-infected plants having greater weight per unit area than later-infected plants or healthy plants. Yield, quality and value of the harvested tobacco were not correlated with number of infected plants per plot, however, probably because of compensation by neighbouring plants.
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