CHMOD access problem when i create a new host or directory

Hi,

I've a problem with my plesk 12.5.30 : when i create a new hosting or a directory in hosting for sub-domain, iwhen i use wordpress and try to add or update plugin for example, wordpress request FTP access.

I need use this commande : sudo chown -R host_user: host_directory
for restore access to the directory, because it's seem it's not created by default.

Can you help me for restore right access when i create a new subdomain directory or new hosting ?