1a.Objectives (from AD-416):
Establish and maintain stem rust sentinel plots in Texas for Ug99 surveillance in the United States.
1b.Approach (from AD-416):
Sentinel plots will be established in southern, central, and northern Texas at the following locations: Weslaco, Uvalde, and Chillicothe. Universal susceptible varieties and critical resistant lines will be planted and maintained during crop season. Rust infections will be recorded during growing season, and samples will be collected and sent to the USDA, ARS, Cereal Disease Laboratory for race analysis. Regular communications will be maintained via conference calls and e-mail.
In the field season of 2013, sentinel plots were established in Castroville, Uvalde, Chillicothe, and Bushland. Due to seed shortage, location in Weslaco was not planted. Plots in Bushland and Chilicothe sustained heavy freezing damage and could not be used. Plots in Castroville and Uvalde were visited multiple times through out the growing season by the collaborators. Stem rust was not detected on plants of the sentinel plots, breeding lines planted at the same locations, or farm fields near by. Thus, we conclude that stem rust was absent at this location in the 2013 season.