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Disease Reactions and Yield Performance of Peanut Genotypes Grown Under Groundnut Rosette and Rosette-Free Field Environments. P. E. Olorunju, Department of Plant Science, Institute for Agricultural Research Samaru, Ahmadu Bello University, PMB 1044, Zaria, Nigeria. C. W. Kuhn, J. W. Demski, S. M. Misari and O. A. Ansa. Division of Plant Pathology, University of Georgia, Athens 30602; and Institute for Agricultural Research Samaru, Ahmadu Bello University, PMB 1044, Zaria, Nigeria. Plant Dis. 75:1269-1273. Accepted for publication 4 June 1991. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-1269.

Experimental field conditions were established to determine the effect of groundnut green rosette (caused by groundnut rosette virus [GRV and its satellite RNA] and groundnut rosette assistor virus [GRAV]) on susceptible and resistant peanut genotypes. Test genotypes were planted in alternate rows with susceptible genotype F 452.4 in which rosette-diseased plants, infested with viruliferous aphids, were transplanted every 1.5 m. When disease incidence was high (90100%) but severity was moderate (measured on rating scale of 15) in susceptible genotypes in 1988, only 910% of the resistant plants of RMP 12 and RG 1 showed very mild mottle. In 1989, when incidence in susceptible plants was 100% and disease was very severe, about 87% of the resistant plants showed symptoms but only 25% had severe symptoms. In the rosette environment, seed yield was 33 times higher in resistant genotypes than in susceptible ones, and yields in general were comparable in the two groups under rosette disease-free conditions. We consider RMP 12 and RG 1 to be highly resistant to GRV and its satellite but not to GRAV, which causes no leaf symptoms by itself but is essential for aphid transmission of GRV and its satellite.