Abstract
The severity of black root rot of tobacco, caused by Thielaviopsis basicola (Berk. and Br.) Ferr., is influenced markedly by soil tempera? ture and pH. Field studies by Johnson and Hartman (5) indicated the occurrence of the disease is determined primarily by soil tempera? ture. Valleau et al. (11) reported that black root rot injured tobacco in the field at 21-23? C, but above 25.5? C the host grew fairly well and the disease caused little damage. It is also well established (3) that black root rot is more severe on soils which have a pH of 6.0 or above. To gain a better understanding of the effects of soil temperature and
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