Exhibit B


Certification  Pursuant  to  Section  906 of  the  Sarbanes-Oxley  Act  of  2002
(subsection  (a) and (b) of section 1350,  chapter 63 of title 18, United States
Code)

In  connection  with the  attached  Report of  Allmerica  Securities  Trust (the
"Trust") on Form N-CSR to be filed with the Securities  and Exchange  Commission
for the  period  ended June 30,  2004 (the  "Report"),  each of the  undersigned
officers of the Trust does hereby  certify that,  to the best of such  officer's
knowledge:

     1.   The Report fully  complies with the  requirements  of Section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     2.   The  information  contained  in the  Report  fairly  presents,  in all
          material respects,  the financial  condition and results of operations
          of the Trust as of, and for, the periods presented in the Report.



Dated: August 19, 2004

/s/ John P. Kavanaugh
- ------------------------------------
John P. Kavanaugh
President and Chairman



Dated: August 19, 2004

/s/ Paul T. Kane
- ------------------------------------
Paul T. Kane
Assistant Vice President and Treasurer
(Principal Accounting Officer and
Principal Financial Officer)