Prevelance of Thielaviopsis basicola in Cotton Soils in Arkansas and its Association with the Root Rot Nematode
Mar 6, 2019

Crop Protection WCRC WCRC2

ABSTRACT
Historically, research based on isolations on non-selective media suggested that black root rot caused by Thielaviopsis basicola was not an important component of the seedling disease complex on cotton in the Midsouth of the USA. Recent research with selective media or direct observation suggests that it is, in fact, a common problem in many fields. An intensive survey of cotton fields in Ashley County, Arkansas was undertaken on soils collected following harvest in 1995 and 1996 to determine the prevalence of T. basicola, using the selective medium TB-CEN. In addition, the association between T. basicola and root knot nematode, Meloidogyne incognita, was examined as a result of an observed early season seedling death and reduced growth caused by an interaction between these two pathogens. The survey results indicate that T. basicola is widespread in the Midsouth and that where M. incognita reaches threshold populations, T. basicola is also common.


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