regulates regulates regulation of developmental process biological regulation germ tube formation regulation of germ tube formation biological_process Any process that modulates the frequency, rate or extent of germ tube formation on or near host. The host is defined as the larger of the organisms involved in a symbiotic interaction. GO:0075010 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.