Relationships of CBR and Insect Resistance and Yield Among Progenies of a CBR-Resistant x Insect-Resistant Cross¹

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The potential for the development of large-seeded, highyielding virginia-type peanuts (Arachis hypogaea L.) with resistance to Cylindrocladium black rot (CBR) and three insects was examined. Forty randomly selected F2 families in F5 generation from a cross of the CBR-resistant germplasm NC 3033 and the cultivar NC 6 were evaluated for yield, fruit traits, and resistance to CBR, thrips (Frankliniella fusca Hinds), corn earworm (Heliothis zea Bodie) and potato leafhopper (Empoasca fabae Harris). Significant differences were found among families for all traits measured except corn earworm damage and number of seed. Transgressive segregation was observed for six of the nine traits measured. Heritabilities were high for pod length, pod weight, and seed weight; moderate for pod yield, CBR resistance, thrips and potato leafhopper damage and low for corn earworm damage. Large negative genotypic correlations were found between CBR resistance (percent dead and diseased plants) and traits indicative of insect resistance. Genotypic correlations between percent dead and diseased plants and yield and fruit traits were large and positive. Based on the predicted response in the other unselected traits when selection is for one trait, selection for increased CBR resistance should result in lines with decreased insect resistance, pod size and weight, seed weight, and yield. These data suggest that unfavorable linkages or pleiotropy among these traits may exist that would prevent selection of desirable genotypes from this cross.

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Keywords: Arachis hypogaea, heritability, genotypic correlations, thrips, potato leafhopper, corn earworm, Cylindrocladium crotalariae.

How to Cite: Green, C. , Wynne, J. , Beute, M. & Campbell, W. (1983) “Relationships of CBR and Insect Resistance and Yield Among Progenies of a CBR-Resistant x Insect-Resistant Cross¹”, Peanut Science. 10(2). doi:

Author Notes

1Paper No. 8821 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC 27650.