General Tomato Spotted Wilt Virus Field Resistance among Spanish and Valencia Market Type Peanut Cultivars.

Abstract

During 2016 through 2020, field tests were conducted to determine general Tomato spotted wilt virus (TSWV) resistance among seven spanish and seven valencia-type peanut (Arachis hypogaea L.) cultivars. These tests were planted early in April each year to enhance tomato spotted wilt (TSW) disease pressure at the University of Georgia, Coastal Plain Experiment Station, Tifton, GA. TSW disease incidence was first assessed at about midseason (60 DAP), and total disease (TD) incidence which was primarily TSW was again assessed prior to digging. The five-year average results showed significant differences (P≤0.05) among the spanish-type cultivars. The lowest TSW and TD incidence was found with the TSWV-resistant spanish cultivar, ‘Georgia-17SP’. This cultivar also produced the highest pod yield, total sound mature kernel (TSMK) grade, and gross dollar value returns per hectare. The five-year average results among the valencia-type cultivars also showed significant differences. The lowest TSW and TD incidence was found with the moderately TSWV-resistant valencia cultivar ‘Georgia-Val/HO’. This cultivar also produced the highest pod yield, TSMK grade, and dollar value return. These new Georgia cultivars are not the traditional spanish and valencia-types; however, pod and seed traits meet or exceed the criteria for each market type, respectively.