Abstract
Groundnut rosette disease transmitted by aphids (Aphis craccivora Koch), is the most destructive disease of groundnut (Arachis hypogaea L) in sub-Saharan Africa. The objective of this research was to evaluate new breeding lines for resistance to groundnut rosette over several field locations and compare the disease ratings with pod yield. One hundred and thirty-four genotypes were evaluated for resistance to rosette and agronomic traits in three contrasting locations in Nigeria over three years. The genotypes were evaluated under both induced and natural rosette epidemics. Under induced disease epidemic, disease incidence raged from 0 on resistant to 100% on susceptible genotypes. Rosette incidence was variable under natural epidemics. Within locations, greater rosette incidence was significantly (P Key Words: Arachis hypogaea, breeding, groundnut, groundnut rosette virus, Nigeria, selection RESUME La rosette de l'arachide transmise par les pucerons (Aphis cracivora Koch) est la maladie la plus destructive de l'arachide (Arachis hypogaea L) en Afrique sub-saharienne. Les objectifs de cette etude etaient d'evaluer de nouvelles lignees de selection d'arachide pour leur resistance a la rosette dans plusieurs localites et de comparer les cote de maladie aux rendements en gousses. Cent trente quatre genotypes ont ete evalues pour leur resistance a la rosette et les traits agronomiques dans trois localites differentes au Nigeria pendant trois ans. Les genotypes ont ete evalues en conditions d'infestation artificielle et naturelle. En condition d'infestation artificielle, l'incidence de la maladie variait de 0 a 100 % sur les genotypes sensibles. L'incidence de la rosette etait variable en condition d'infestation naturelle. Entre les localites, la plus grande incidence etait significativement (P Mots Cles: Arachis hypogaea, amelioration varietale, arachide, virus de la rosette de l'arachide, Nigeria, selection (African Crop Science Journal 2001 .9(2): 451-461)
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