Disease Incidence Gradient and the Effect of Seedbed Infection on Potato Virus Y Outbreaks in Tobacco

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Abstract
Veinbanding caused by potato virus Y (PVY) has become widespread in Chilean tobacco, affecting flue-cured, burley, and oriental types. Severe losses have resulted from a necrotic strain of PVY. A disease incidence gradient was determined by regression analysis (loge I = loge a - b logeX) of disease incidence over distance in meters from a line-focus source of weeds growing along irrigation ditches. Weeds may be important sources of PVY and/or breeding sites for aphid vectors. Incidence of PVY in tobacco seedlings just before transplanting varied from 1 to 19%; however, final incidence seemed to be highly dependent on other factors, presumably aphid vector activity.

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