Resistance to Ditylenchus africanus present in peanut breeding lines

摘要

Peanut is an important cash crop both for commercial and small-scale farmers in South Africa.The effect of Ditylenchus africanusonpeanutismainlyqualitative,leadingtodowngradingofconsignments.Thisnematodeisdif?culttocontrolbecauseofits high reproductive and damage potential.The objective of this study was to identify peanut genotypes with resistance to D.africanus thatwouldalsobe sustainableunder?eldconditions.SelectedpeanutgenotypeswereevaluatedagainstD.africanusin microplotand ?eld trials.The inbred lines PC254K1 and CG7 were con?rmed to be resistant to D.africanus.The resistance expressed by these two genotypeswas sustainable under ?eld conditions.The breeding line PC287K5 maintainedlow nematodenumbers in some trials, but its level of resistance was not as strong or as sustainable as that of PC254K1 or CG7.However, PC287K5 could still play an important role in the peanut industry where lower D.africanus populations occur.