pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-6-2-9 Articles Web Blotch Resistance in Arachis hypogaea1 O. D. Smith , D. H. Smith , and C. E. Simpson 2 Associate Prof., Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843; Associate Prof., Texas A&M Univ. Plant Dis. Res. Stn., Yoakum, TX 77995;. and Associate Prof., Texas A&M Univ. Res. and Ext. Ctr., Stephenville, TX 76401

1TA No. 15073 of the Texas Agri. Exp. Stn., Texas A&M Univ., College Station, TX 77843.

 7 1979 6 2 99 101 21 8 1979 American Peanut Research and Education Society 1979 American Peanut Research and Education Society Abstract

Seventeen genotypes of peanut, Arachis hypogaea L., consisting of Spanish, Runner, and Virginia market types were evaluated for resistance to web blotch caused by Phoma arachidicola Marasas, Pauer and Boerema in small plot field tests. Disease ratings were obtained by determining percentages of infected attached leaflets and abscinded leaflets. Marked differences in disease resistance were observed, and three levels of susceptibility were evident. Entries of the Virginia and Runner market types were generally more resistant to web blotch than the Spanish. Definitive yield and grade effects were not discernible, but indications were that yield and kernel size were affected.

 Key Words Peanut; , groundnut; , foliar diseases; , net blotch; , hostplant resistance; , disease control; , epidemiology; , Phoma arachidicola; , Mycosphaerella argentinensis; , Didymosphaeria arachidicola.