There you go, just find their user agents on the net and replace:
Code:
# Block bad spiders
RewriteCond %{HTTP_USER_AGENT} Baiduspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Sogou [NC,OR]
RewriteCond %{HTTP_USER_AGENT} GSLFbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Wotbox [NC,OR]
RewriteCond %{HTTP_USER_AGENT} MJ12bot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Sosospider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Ezooms [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Yandex
RewriteRule ^.* - [F,L]