pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-10-2-8 Articles Agronomic Potential of Six Cylindrocladium Black Rot Resistant Peanut Lines1 T. A. Coffelt 2 Research Geneticist, Agricultural Research Service, U.S. Department of Agriculture, Tidewater Research Center, Suffolk, Virginia 23437

1Cooperative investigations of the Agricultural Research Service, U.S. Department of Agriculture, and the Virginia Polytechnic Institute and State University. Research was supported in part by ARS grant No. 12-14-7001-855.

 7 1983 10 2 72 75 24 9 1983 American Peanut Research and Education Society 1983 American Peanut Research and Education Society Abstract

Six Cylindrocladium black rot (CBR) resistant peanut (Arachis hypogaea L.) lines (Spancross, Tamnut 74, NC 3033, VGP 1, GA 722105, and Toalson) and one susceptible line (Florigiant) were evaluated in field experiments for agronomic potential. All experiments (one each in 1976 and 1977 and two in 1978) were located in fields (sites) where CBR had previously occurred. The percentage of CBR symptomatic plants, yield per hectare, and market grade were measured at each site. In addition, the percentage of damaged roots and a visual rating of pod damage were determined at three sites (one in 1977 and two in 1978). Florigiant had a significantly higher yield and percentage of CBR symptomatic plants than the six CBR resistant lines. No significant differences occurred among the six resistant lines for percentage of CBR symptomatic plants. VGP 1 and GA 722105 had significantly lower yields than the other four resistant lines. These results indicate the low agronomic potential of the resistant lines.

 Key Words groundnut; , Cylindrocladium crotalariae; , Calonectria crotalariae; , disease resistance; , plant breeding; , Arachis hypogaea L