AbstractIn order to establish a genetic model of the resistance toPhytophthora capsiciinCapsicum annuumgenotype ‘SCM‐334’, two experiments were conducted which included ‘SCM‐334’, as well as, the susceptible line ‘Morrón INIA 224’ and their Fl, F2, F3 and BC1 generations. We also tried to introgress a recessive gene, hypothetically responsible for resistance toP. capsici, from ‘SCM‐334’ into ‘Morrón INIA 224’. Inoculations were made, when plants had 4—6 leaves, by irrigating the culture substrate with a zoospore suspension ofP. capsiciisolate ‘Bl’. The χ2test was applied to segregating generations to determine how many genes were involved in resistance. The hypothesis which explained the obtained segregations best, although not completely, was one that assumes 3 genes in ‘SCM‐334’;, with at least 3 alleles in the heterozygous condition or 4 at any position, present in any genotype in order to be resistant. The influence of the isolate's aggressiveness and the inocula
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