SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                                   FORM 12b-25

                                                Commission File Number:  0-22307

                           NOTIFICATION OF LATE FILING


      (Check One): [ ] Form 10-K  [ ] Form 11-K  [ ] Form 20-F  [X] Form 10-Q
[ ] Form N-SAR

For Period Ended:  December 31, 1998
                   -----------------

[ ] Transition Report on Form 10-K      [ ] Transition Report on Form 10-Q
[ ] Transition Report on Form 20-F      [ ] Transition Report on Form N-SAR
[ ] Transition Report on Form 11-K

For the Transition Period Ended:
                                -------------------------

     Read attached  instruction  sheet before  preparing  form.  Please print or
type.

     Nothing in this form shall be  construed to imply that the  Commission  has
verified any information contained herein.

     If the  notification  relates  to a portion of the  filing  checked  above,
identify the item(s) to which the notification relates:
                                                       -------------------------

                                     PART I
                             REGISTRANT INFORMATION

Full name of registrant             Senesco Technologies, Inc.
                         ---------------------------------------------------

Former name if applicable           Nava Leisure USA, Inc.
                         ---------------------------------------------------

Address of principal executive office (Street and number)

                                   34 Chambers Street
- --------------------------------------------------------------------

City, State and Zip Code      Princeton, New Jersey 08542
                         -------------------------------------------

PART II RULE 12b-25 (b) AND (c) If the subject report could not be filed without unreasonable effort or expense and the registrant seeks relief pursuant to Rule 12b-25(b), the following should be completed. (Check appropriate box.) [X] (a) The reasons described in reasonable detail in Part III of this form could not be eliminated without unreasonable effort or expense; [X] (b) The subject annual report, semi-annual report, transition report on Form 10-K, 20-F, 11-K or Form N-SAR, or portion thereof will be filed on or before the 15th calendar day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q, or portion thereof will be filed on or before the fifth calendar day following the prescribed due date; and [ ] (c) The accountant's statement or other exhibit required by Rule 12b-25(c) has been attached if applicable. PART III NARRATIVE State below in reasonable detail the reasons why the Form 10-K, 11-K, 20-F, 10-Q, N-SAR or the transition report portion thereof could not be filed within the prescribed time period. (Attach extra sheets if needed). Senesco Technologies, Inc. (the "Company") is unable to timely file its Quarterly Report on Form 10-QSB for the Quarter Ended December 31, 1998 (the "Form 10-QSB") without unreasonable effort or expense because management of the Company has been utilizing much of its efforts in fully integrating the Company's operations after the recent merger of Nava Leisure Acquisition Corp., a New Jersey corporation and wholly-owned subsidiary of Nava Leisure USA, Inc., an Idaho corporation, with and into Senesco, Inc., a New Jersey corporation, consummated on January 22, 1999. The Form 10-QSB is currently being prepared and will be filed no later than the fifth calendar day following the February 14, 1999 due date of the Form 10-QSB.

PART IV OTHER INFORMATION (1) Name and telephone number of person to contact in regard to this notification. Phillippe O. Escaravage (609) 252-0680 - ---------------------------------------------------------------- (Name) (Area Code) (Telephone Number) (2) Have all other periodic reports required under Section 13 or 15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for such shorter period that the registrant was required to file such report(s) been filed? If the answer is no, identify report(s). [X] Yes [ ] No (3) Is it anticipated that any significant change in results of operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the subject report or portion thereof? [ ] Yes [X] No If so: attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a reasonable estimate of the results cannot be made. Senesco Technologies, Inc. - -------------------------------------------- (Name of registrant as specified in charter) Has caused this notification to be signed on its behalf by the undersigned thereunto duly authorized. Date: February 16, 1999 By: /s/Phillippe O. Escaravage ------------------------------------------- Name: Phillippe O. Escaravage Title: Chairman and Chief Operating Officer Instruction. The form may be signed by an executive officer of the registrant or by any other duly authorized representative. The name and title of the person signing the form shall be typed or printed beneath the signature. If the statement is signed on behalf of the registrant by an authorized representative (other than an executive officer), evidence of the representative's authority to sign on behalf of the registrant shall be filed with the form.

ATTENTION Intentional misstatements or omissions of fact constitute Federal criminal violations (see 18 U.S.C. 1001). GENERAL INSTRUCTIONS 1. This form is required by Rule 12b-25 of the General Rules and Regulations under the Securities and Exchange Act of 1934. 2. One signed original and four conformed copies of this form and amendments thereto must be completed and filed with the Securities and Exchange Commission, Washington, DC 20549, in accordance with Rule 0-3 of the General Rules and Regulations under the Act. The information contained in or filed with the form will be made a matter of the public record in the Commission files. 3. A manually signed copy of the form and amendments thereto shall be filed with each national securities exchange on which any class of securities of the registrant is registered. 4. Amendments to the notification must also be filed on Form 12b-25 but need not restate information that has been correctly furnished. The form shall be clearly identified as an amended notification. 5. Electronic Filers. This form shall not be used by electronic filers unable to timely file a report solely due to electronic difficulties. Filers unable to submit a report within the time period prescribed due to difficulties in electronic filing should comply with either Rule 201 or Rule 202 of Regulation S-T or apply for an adjustment in filing date pursuant to Rule 13(b) of Regulation S-T.