Crown and fruit rot caused by Phytophthora capsici result in substantial loss on cucurbit hosts in Michigan each year. A hierarchal sampling strategy was utilized to assess the incidence and distribution of A1 and A2 mating types and metalaxyl sensitive (MS) and insensitive (MI) strains in Michigan during 1998. Single zoospore isolates (524) from 16 fields (15 cucurbit, 1 pepper) were tested for mating type using known A1 and A2 cultures. Metalaxyl sensitivity was determined based on the growth of isolates on 0, 10, and 100 µg/ml metalaxyl amended V8 agar. Thirty percent of the isolates were classified as MI, 16% as intermediate, and 54% as MS with 70% of the fields sampled containing insensitive isolates. A total of 267 A1 and 257 A2 isolates were recovered with both mating types being found in every field. Insensitive isolates occurred among both mating types. Oospores were found in diseased cucurbit fruit from four farms. Inoculation studies, and observations of naturally infected fruit, indicate that mixed A1/A2 infections can result in an oospore containing mycelial mat on the surface of the fruit in addition to the asexual sporulation observed with single A1 or A2 infections.