ABSTRACT
Pythium ultimum can be a major component of the seed-seedling disease complex of cotton on the Texas High Plains. Twelve isolates were tested for pathogenicity using a culture plate method. The method was developed by N.A. Altier and J.A. Thies at the University of Minnesota in screening alfalfa for resistance (1995). Cultures were grown on corn meal agar for three days at 22o C. Pythium cultures were then transferred to water agar and grown for three days at 22o C. 'Paymaster HS-26', a known susceptible cultivar, was used to determine the virulence of the isolates.
|