negatively regulates negative regulation of developmental process biological regulation hyphopodium formation regulation of hyphopodium formation negative regulation of hyphopodium formation Any process that stops, prevents, or reduces the frequency, rate or extent of symbiont hyphopodium formation on or near its host organism. The host is defined as the larger of the organisms involved in a symbiotic interaction. GO:0075190 negative regulation of hyphopodium formation on or near host biological_process