With increasing age of pepper plants, all cultivars tested became gradually resistant to Phytophthora blight. High inoculum concentrations of P. capsici resulted in symptoms on some resistant cultivars. The incubation periods of P. capsici in resistant pepper cultivars and old plants were longer than those in susceptible cultivars and young plants, respectively. The soil-drench method of inoculation was more reliable than the stem-inoculation method for evaluation of age-related resistance. Appropriate screening techniques for evaluation of age-related resistance are discussed
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Young Jin Kim (1989) studied this question.