Phytophthora capsici was isolated from seven pepper and seven cucurbit fields in North Carolina. The relative virulence of the isolates was tested on pepper (Capsicum annuum), morphological characteristics of sporangia and oospores were evaluated, and mating type and growth response to temperature were determined. All pepper and some cucurbit isolates of P. capsici were highly virulent on pepper, whereas other cucurbit isolates were less virulent on pepper. Sporangia of cucurbit isolates were greater than 55 μm in length and were less variable in length than sporangia of pepper isolates (...)
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Jean B. Ristaino (1990) studied this question.