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Striga hermonthica  is the most important parasitic weed in sub-Saharan Africa and remains one of the most devastating biotic factors affecting sorghum production in the western regions of Kenya. Farmers have traditionally managed  Striga  using cultural methods, but the most effective and practical solution to poor smallholder farmers is to develop  Striga -resistant varieties. This study was undertaken with the aim of identifying new sources of resistance to  Striga  in comparison with the conventional sources as standard checks. We evaluated 64 sorghum genotypes consisting of wild relatives, landraces, improved varieties, and fourth filial generation (F 4 ) progenies in both a field trial and a pot trial. Data were collected for days to 50% flowering (DTF), dry panicle weight (DPW, g), plant height (PH, cm), yield (YLD, t ha −1 ), 100-grain weight (HGW, g), overall disease score (ODS), overall pest score (OPS), area under  Striga  number progress curve (ASNPC), maximum above-ground  Striga  (NS max ), and number of  Striga -forming capsules (NSFC) at relevant stages. Genetic diversity and hybridity confirmation was determined using Diversity Arrays Technology sequencing (DArT-seq). Residual heterosis for HGW and NS max  was calculated as the percent increase or decrease in performance of F 4  crossover midparent (MP). The top 10 best yielding genotypes were predominantly F 4  crosses in both experiments, all of which yielded better than resistant checks, except FRAMIDA in the field trial and HAKIKA in the pot trial. Five F 4  progenies (ICSVIII IN × E36-1, LANDIWHITE × B35, B35 × E36-1, F6YQ212 × B35, and ICSVIII IN × LODOKA) recorded some of the highest HGW in both trials revealing their stability in good performance. Three genotypes (F6YQ212, GBK045827, and F6YQ212xB35) and one check (SRN39) were among the most resistant to  Striga  in both trials. SNPs generated from DArT-seq grouped the genotypes into three major clusters, with all resistant checks grouping in the same cluster except N13. We identified more resistant and high-yielding genotypes than the conventional checks, especially among the F 4  crosses, which should be promoted for adoption by farmers. Future studies will need to look for more diverse sources of  Striga  resistance and pyramid different mechanisms of resistance into farmer-preferred varieties to enhance the durability of  Striga  resistance in the fields of farmers.

Genotypic Variation in Cultivated and Wild Sorghum Genotypes in Response to Striga hermonthica Infestation