pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-6-1-10 Articles Heritability of Cylindrocladium Black Rot Resistance in Peanut1 B. A. Hadley , M. K. Beute , and J. C. Wynne 2 Former Graduate Student and Professor, Department of Plant Pathology, and Associate Professor, Crop Science Department, North Carolina State University, Raleigh, respectively

1Paper No. 5784 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, N. C.

3Use of trade names in this publication does not imply endorsement by the N. C. Agricultural Research Service of the products named, nor criticism of similar ones not mentioned.

 1 1979 6 1 51 54 24 1 1979 American Peanut Research and Education Society 1979 American Peanut Research and Education Society Abstract

In order to estimate heritability of resistance to Cylindrocladium black rot (CBR), caused by Cylindrocladium crotalariae, in peanuts (Arachis hypogaea), the F1 F2 and parental generations from a four-parent diallel cross were rated for resistance under optimum greenhouse conditions. General combining ability was significant for both generations suggesting that resistance to Cylindrocladium black rot in these lines was primarily due to additive genetic effects.

The four parents produced progeny having different levels of resistance. NC3033, Argentine and NC2 produced progeny from which resistant selections could be made, while Florigiant produced susceptible progenies in all crosses.

Estimates of heritability ranged from 0.48 to 0.65 depending on the method of calculation. Based on these estimates, early generation selection for CBR-resistance in the greenhouse should be effective.

 Key Words disease resistance; , diallel cross; , general combining ability; , Arachis hypogaea.