Abstract
Three-month old pepper cuttings in nutrient solutions of pH 3·0–8·0 were inoculated with Phytophthora palmivora (Butl.) Bud. on triturated pepper roots. Death occurred after 13 days at pH 6·0, 16 days at pH 8·0 and 23 days at pH 4·5. No infection occurred at pH 3·0. In the majority of twenty isolates of the causal organism kept in Petri's solution of pH 3·0–8·0, no sporangia were produced at pH 3·0, some sporangia were produced at pH 4·5, maximum sporulation occurred at pH 6·0 and declined at pH 8·0. It is suggested that disease development is prevented at low pH due to suppression of sporulation and sporangial germination.
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