|JACKSON, KEN - OKLAHOMA STATE UNIV
Submitted to: Oklahoma Agriculture Experiment Station Departmental Publication
Publication Type: Experiment Station
Publication Acceptance Date: 8/4/1997
Publication Date: N/A
Interpretive Summary: Article summarizes current status of research efforts; no new research reported.
Technical Abstract: This investigation is a part of our continued efforts for the last several years to comprehensively study the epidemiology, disease resistance, and management of soilborne peanut pathogens. Field plots were planted May 22, 1996 in a Verticillium-infested soil near Chickasha. Verticillium wilt disease incidence was assessed on October 1. Plots were harvested on October 24. Nine peanut cultivars and breeding lines were included in this study. Each plot consisted of four 15-foot rows, with four replications. Incidence of Verticillium wilt was read in the middle two rows. Wilt incidence was low in all genotypes tested. One peanut line (TX901639-3) showed significant resistance to verticillium wilt. Disease, yield, and grade data are presented in the following table. Soil from heavy infested fields was collected, and several amendments, which included water, water plus crushed dried peanut leaves, methanol (one percent), and methanol (one epercent) plus crushed dried peanut leaves, were added as agents to stimulate sclerotial germination of Sclerotium rolfsii. The data indicate that crushed peanut leaves in the presence of methanol were best in stimulating the sclerotial germination. More research is being conducted to determine the feasibility of using this information 1) to identify southern blight problem fields, and 2) to develop a more realistic greenhouse screening procedure to identify resistance in peanut germplasm to the southern blight fungus.