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Variation In Yield And Resistance To Groundnut Rosette Disease In Early- And Medium-Maturing Groundnut Genotypes in Nigeria
Ist Teil von
African crop science journal, 2001-12, Vol.9 (2)
Ort / Verlag
Uganda: African Crop Science Society
Erscheinungsjahr
2001
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
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<0.01)
correlated with reduced pod yield. A high level of resistance to
rosette was demonstrated in both early and medium-maturing genotypes.
Genotypes resistant to rosette disease and superior to the widely grown
cultivars in terms of acceptable pod yield, seed size and colour were
identified.