Field resistance to cylindrocladium black rot and tomato spotted wilt virus among advanced runner-type peanut breeding lines

Abstract

Disease resistant cultivars are urgently needed to minimize damage and reduce chemical control costs in USA runner market type peanut ( Arachis hypogaea L.) production. Field trials were conducted for three consecutive years (1999, 2000, and 2001) to evaluate several advanced runner-type breeding lines developed by the Georgia peanut breeding program for Cylindrocladium black rot (CBR) resistance and tomato spotted wilt virus (TSWV) resistance. The test site at the University of Georgia, Southeast Georgia Branch Experiment Station near Midville, GA, is known to be heavily infested with Cylindrocladium parasiticum Crous, Wingfield and Alfenas; syn C. crotalariae (Loos) Bell and Sobers, the causal agent of CBR. Significant differences were found among genotypes for mid-season disease incidence, mid-late season disease incidence, late-season disease incidence, and after digging disease incidence as well as pod yields. Disease incidence ratings included both CBR and TSWV, but the predominant disease late in the growing season was CBR. Several advanced runner-type Georgia breeding lines and cultivars were found to be significantly better in TSWV-resistance and comparable to the best CBR-resistant virginia-type check cultivars in CBR disease incidence and pod yield.