At a Glance
Peanut cultivars are available that have high resistance to the peanut root-knot nematode (Meloidogyne arenaria) or spotted wilt caused by tomato spotted wilt tospovirus (TSWV). However, no cultivars exist that have resistance to both pathogens. Tifguard was developed to combine resistance to both pathogens in a single cultivar by hybridizing a TSWV-resistant cultivar with a nematode-resistant cultivar.
Tifguard has a runner-type growth habit with dark green foliage and a prominent main stem. Because of its high level of resistance to both TSWV and M. arenaria, Tifguard had significantly higher yields than all other entries when grown in two locations with high pressure from both pathogens. This cultivar should be valuable for peanut growers who have to deal with both pathogens.
Field tests for resistance to peanut root-knot nematode were conducted at two Georgia farms in Tift County that were heavily infested. In testing for TSWV-resistance, Tifguard plants were grown in plots at one Tift County farm that also displayed severe TSWV problems. Not only did Tifguard exhibit higher resistance to TSWV, it also produced higher yields than standard check cultivars when grown in fields with little or no nematode pressure. Because of its high level of resistance to both TSWV and root knot nematode, Tifguard had significantly higher yields than all other varieties when grown in two locations with high pressure from both pathogens.
Tifguard was developed at the University of Georgia’s Coastal Plain Experiment Station in Tifton, Ga., by C. Corley Holbrook in the U.S. Department of Agriculture-Agricultural Research Service (ARS) Crop Genetics and Breeding Research Unit; plant pathologist Patricia Timper in the ARS Crop Protection and Management Research Unit; and University of Georgia collaborators Albert Culbreath and Craig K. Kvien (College of Agriculture and Environmental Sciences ) and released by U.S. Department of Agriculture-Agricultural Research Service and the Georgia Agricultural Experiment Stations in 2007. This protected peanut variety can only be sold as a class of certified seed by individuals who are licensed by Georgia’s Integrated Cultivar Release System under guidelines established in conjunction with the University of Georgia Research Foundation (UGARF). (Reg. No. CV-101, PI 651853)