positively regulates positive regulation of biological process biological regulation formation of arbuscule for nutrient acquisition regulation of arbuscule formation for nutrient acquisition from host positive regulation of arbuscule formation for nutrient acquisition from host biological_process 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. GO:0075330 Any process that activates or increases the frequency, rate or extent of symbiont arbuscule formation for nutrient acquisition from host. The host is defined as the larger of the organisms involved in a symbiotic interaction.