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                               UNITED STATES                                OMB APPROVAL
                    SECURITIES AND EXCHANGE COMMISSION             ------------------------------
                          Washington, D.C. 20549                   OMB Number 3235-0145
                                                                   ------------------------------
                                                                   Expires:   February 28, 2009
                                                                   ------------------------------
                                                                   Estimated average burden
                                                                   hours per response . . . 11


                              INITIAL SCHEDULE 13G


                    Under the Securities Exchange Act of 1934


                            Seneca Foods Corporation
-------------------------------------------------------------------------------
                                (Name of Issuer)

                              Class A Common Stock
-------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    817070501
-------------------------------------------------------------------------------
                                 (CUSIP Number)

                                 August 18, 2006
-------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

        |x|       Rule 13d-1(b)

                  Rule 13d-1(c)

                  Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).








                                PAGE 1 OF 7 PAGES





----------------------                                    ---------------------
CUSIP No. 817070501                 13G                   Page  2  of  7  Pages
----------------------                                    ---------------------

-------------------------------------------------------------------------------
        
    1      NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only).

           Manulife Financial Corporation

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    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  |_|
                                                                  (b)  |_|
           N/A
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    3      SEC USE ONLY

-------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           Canada

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                       5     SOLE VOTING POWER

                             -0-
                       --------------------------------------------------------
    Number of          6     SHARED VOTING POWER
      Shares
   Beneficially              -0-
     Owned by          --------------------------------------------------------
       Each            7     SOLE DISPOSITIVE POWER
    Reporting
      Person                 -0-
       With            --------------------------------------------------------
                       8     SHARED DISPOSITIVE POWER

                             -0-
-------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           None, except through its indirect, wholly-owned subsidiaries.
           See Item 4.
-------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
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   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           See line 9 above.
-------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           HC
-------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 2 OF 7 PAGES






----------------------                                    ---------------------
CUSIP No. 817070501                 13G                   Page  3  of  7  Pages
----------------------                                    ---------------------

-------------------------------------------------------------------------------
        
    1      NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only).

           John Hancock Life Insurance Company

-------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  |_|
                                                                  (b)  |_|
           N/A
-------------------------------------------------------------------------------
    3      SEC USE ONLY

-------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION

           Massachusetts
-------------------------------------------------------------------------------
                       5     SOLE VOTING POWER

                             1,005,874 directly and 19,346 indirectly through
                             its direct, wholly-owned subsidiary John Hancock
                             Variable Life Insurance Company.
                       --------------------------------------------------------
    Number of          6     SHARED VOTING POWER
      Shares
   Beneficially              -0-
     Owned by          --------------------------------------------------------
       Each            7     SOLE DISPOSITIVE POWER
    Reporting
      Person                 1,005,874 directly and 19,346 indirectly through
       With                  its direct, wholly-owned subsidiary John Hancock
                             Variable Life Insurance Company.
                        --------------------------------------------------------
                       8     SHARED DISPOSITIVE POWER

                             -0-
-------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,025,220
-------------------------------------------------------------------------------
   10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
-------------------------------------------------------------------------------
   11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           17.77%
-------------------------------------------------------------------------------
   12      TYPE OF REPORTING PERSON*

           IA, IC
-------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 3 OF 7 PAGES



Attention:  Intentional  misstatements  or omissions of fact constitute  Federal
            criminal violations (See 18 U.S.C. 1001)

   Item 1(a)    Name of Issuer:
                ---------------
                Seneca Foods Corporation

   Item 1(b)    Address of Issuer's Principal Executive Offices:
                ------------------------------------------------
                3736 South Main Street
                Marion, New York 14505????

   Item 2(a)    Name of Person Filing:
                This filing is made on behalf of Manulife Financial  Corporation
                ("MFC"),  and  MFC's  indirect,  wholly-owned  subsidiary,  John
                Hancock Life Insurance Company ("JHLICO").

   Item 2(b)    Address of the Principal Offices:
                The  principal  business  office of MFC is  located at 200 Bloor
                Street, East, Toronto,  Ontario,  Canada, M4W 1E5; and JHLICO is
                located at P. O. Box 111, Boston, Massachusetts 02117.

   Item 2(c)    Citizenship:
                MFC is organized and exists under the laws of Canada.
                JHLICO  is   organized   and  exists   under  the  laws  of  the
                Commonwealth of Massachusetts.

   Item 2(d)    Title of Class of Securities:
                Class A Common Stock

   Item 2(e)    CUSIP Number:
                817070501

   Item 3       If the Statement is being filed  pursuant to Rule  13d-1(b),  or
                13d-2(b), check whether the person filing is a:

                MFC:     (g) (X) Parent  Holding  Company,  in accordance  with
                                 ss.240.13d-1(b)(ii)(G).


                JHLICO:  (e) (X) Investment  Adviser registered under ss.203 of
                                 the Investment Advisers Act of 1940.

   Item 4       Ownership:

                (a) Amount Beneficially Owned: JHLICO has beneficial ownership
                    of  1,025,220  shares  of  Class A  Common  Stock  through
                    beneficial  ownership of 1,025,220  shares of  Convertible
                    Participating  Preferred  Stock,  Series  2006  (of  which
                    19,346  shares are held by JHLICO's  direct,  wholly-owned
                    subsidiary, John Hancock Variable Life Insurance Company),
                    which are convertible  into shares of Class A Common Stock
                    on  a   one-for-one   basis,   subject   to   antidilution
                    adjustment.  Through its parent-subsidiary relationship to
                    JHLICO and JHVLICO,  MFC may be deemed to have  beneficial
                    ownership of these same shares.


                           PAGE 4 OF 7 PAGES


               (b) Percent of Class: The issuer has 4,743,794 shares of Class
                   A Common Stock outstanding,  based on information provided
                   by the issuer to the reporting persons on August 18, 2006.
                   Assuming   full   conversion   of  the   preferred   stock
                   beneficially  owned by JHLICO,  JHLICO would own 1,025,220
                   shares of the issuer's  Class A Common Stock,  which would
                   represent  17.77%  of the  issuer's  Class A Common  Stock
                   outstanding after such conversion.

               (c) Number of shares as to which the person has:

                   (i)  sole power to vote or to direct the vote:

                        JHLICO  has sole  power to vote or to direct the voting
                        of the shares it beneficially owns.

                   (ii) shared power to vote or to direct the vote:
                        -0-

                   (iii)sole power to dispose or  to direct the disposition of:

                        JHLICO has sole power to dispose or to direct the
                        disposition of the shares it beneficially owns.

                   (iv) shared power to dispose or to direct the disposition of:
                        -0-

   Item 5       Ownership of Five Percent or Less of a Class:
                Not applicable.

   Item 6       Ownership of More than Five Percent on Behalf of Another Person:
                Not applicable.

   Item 7       Identification and Classification of the Subsidiary which
                Acquired the Security Being Reported on by the Parent Holding
                Company:
                See Items 3 and 4 above.

   Item 8       Identification and Classification of Members of the Group:
                Not applicable.

   Item 9       Notice of Dissolution of a Group:
                Not applicable.

   Item 10      Certification:
                By signing below the undersigned certifies that, to the best of
                its knowledge and belief, the securities referred to above were
                acquired  and are held in the  ordinary  course of business and
                were not  acquired  and are not held for the purpose of or with
                the effect of changing or influencing the control of the issuer
                of the  securities  and were not  acquired  and are not held in
                connection with or as a participant in any  transaction  having
                that purpose or effect.


                             PAGE 5 OF 7 PAGES


                                 SIGNATURE

    After reasonable  inquiry and to the best of its knowledge and belief,  each
of the undersigned certifies that the information set forth in this statement is
true, complete and correct.


                                 Manulife Financial Corporation


                                 By:      /s/ Angela Shaffer
                                 Name:    Angela Shaffer
Dated:  August 28, 2006          Title:   Vice President and Corporate Secretary


                                 John Hancock Life Insurance Company


                                 By:      /s/ Warren A. Thomson
                                 Name:    Warren A. Thomson
                                 Title:   Executive Vice President and Chief
Dated:  August 28, 2006                    Investment Officer - US Investments




                                PAGE 6 OF 7 PAGES


EXHIBIT A
                             JOINT FILING AGREEMENT
                             ----------------------

    Manulife Financial Corporation and John Hancock Life Insurance Company agree
that the Initial  Schedule 13G to which this Agreement is attached,  relating to
the Class A Common Stock of Seneca Foods Corporation, is filed on behalf of each
of them.


                                 Manulife Financial Corporation


                                 By:      /s/ Angela Shaffer
                                 Name:    Angela Shaffer
Dated:  August 28, 2006          Title:   Vice President and Corporate Secretary


                                John Hancock Life Insurance Company


                                By:       /s/ Warren A. Thomson
                                Name:     Warren A. Thomson
Dated:  August 28, 2006         Title:    Executive Vice President and Chief
                                           Investment Officer - US Investments




                                PAGE 7 OF 7 PAGES