sabarishks, That is your best solution? You probably don't own a server. There's no point for me installing mod_secutiry if i'm just gonna disable it in some accounts. Specially, that's the account that always get hacked.
I wouldn't disable it for a site, though you can for some good reasons, and you should whitelist, maybe any spiders/bots by checking the USER_AGENT env var, which would make it easier. Exactly what is it flagging though? It looks like it was denying access to index.php, and regardless of it being a spider or not, this probably shouldn't be happening. If it's blocking a search engine spider, it might be blocking legitimate, normal users as well. What was in the body, "on line"?