Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 3/5/2007
Publication Date: 7/1/2007
Citation: Dong, W.B., Brenneman, T.B., Holbrook Jr, C.C., Culbreath, A.K. 2007. Evaluation of resistance to Cylindrocladium parasiticum in peanut in naturally infested or inoculated fields, and in the greenhouse. Phytopathology 97(7):S181. Interpretive Summary: not required
Technical Abstract: Our objective was to evaluate six runner peanut (Arachis hypogaea) genotypes with varying resistance to Cylindrocladium black rot (CBR) in a naturally infested field, an inoculated field, and in greenhouse trials. The genotypes GA-02C and Georganic had low plant mortalities, whereas C-99R and DP-1 had high mortalities in infested fields in 2005 and 2006. Plant mortalities in GA-01R were moderate in both years, but were inconsistent in C34-24-85. GA-02C and Georganic also showed partial resistance to CBR in greenhouse tests. Field inoculations of GA-02C and Georganic had little pod rot from CBR, and Georganic also had relatively lower pod loss. Plant mortality in the infested field test was correlated with disease and yield in the inoculated test, but neither was correlated with disease ratings for greenhouse tests. The variability of disease levels was highest in the infested field. Peanut genotypes are most reliably screened in field tests, but greenhouse evaluations may help identify and characterize components of resistance.