regulates regulates regulation of developmental process modulation by symbiont of entry into host biological regulation penetration peg formation modulation of penetration peg formation Note that this term should not be used to annotate gene products of the host. It should only be used to annotate those gene products from the symbiont involved in this process. modulation of symbiont penetration peg initiation modulation of symbiont penetration peg formation for entry into host biological_process GO:0075058 Any process that modulates the frequency, rate or extent of symbiont penetration peg formation for entry into host. The host is defined as the larger of the organisms involved in a symbiotic interaction. GO:0075054