Abstract
Eight peanut cultivars (Okrun, Southwest Runner, Tamrun 98, Tamrun 96, Georgia Green, Tamrun OL 01, Tamrun OL 02, and Georgia Hi Oleic) were planted near Pearsall, TX, in 2001, 2002, and 2003 to determine their reaction to TSWV. Plots consisted of two rows (9 m long with 0.91 m row spacing), and were arranged in a randomized complete block design with four replications. Because of a low disease incidence of TSWV in 2002 only one reading was taken at 135 days post planting, where Georgia Green and Georgia Hi Oleic exhibited the least disease incidence. In 2001 and 2003 infection of peanut cultivars with TSWV was observed as early as 30 days post planting, and TSWV disease developed gradually throughout the two growing seasons. In 2001, area under disease progress curve (AUDPC) for Georgia Hi Oleic, Georgia Green, and Tamrun 96 were 162, 202 and 212, respectively, whereas Okrun, Tamrun 98, and Southwest Runner had 310, 341, and 373, respectively. In 2003, AUDPC for Georgia Hi Oleic, Georgia Green, and Tamrun 96 were 120, 125 and 187, respectively, whereas Tamrun 98 and Okrun had 215 and 230, respectively. In summary, data showed that Georgia Green, Georgia Hi Oleic and Tamrun 96 exhibited the best resistance to the naturally occurring TSWV isolates in the Pearsall area.