Parsing Blast results for different genus

Dear All,

I have obtained several .gb BLAST results that I want to split in different 
.gb or .fasta files accordingly to genus.

I searched for different ways to do it in the web, but didn't find a way to 
do it when one has something like 50 genus in the blast.

(to do it for a short number or genus I could use splitgb.pl from 
http://www.bioperl.org/wiki/HOWTO:SeqIO but it will not be feasible for a 
large number of genus).

Is there a script of way to do it in a efficient way ?

Best

PS sorry if this message appears twice ... as i was having some trouble 
posting the first time.