URGENT !!! Delete Query

Hi,

Can some one please tell me how I can use a delete query. I have the following code, but it does not work. Please let me know where I am going wrong
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Dim StrSQL As String
StrSQL = "Delete FROM PLANT WHERE PLANT_CODE = ' " & PLANT_CODE_txt & " ' "
DoCmd.RunSQL StrSQL
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In the above and below code PLANT_CODE_txt is the form field that I am taking values from to delete from the table

(or)

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Dim StrSQL As String
dim pt_code as string
pt_code = me.PLANT_CODE_txt
StrSQL = "Delete FROM PLANT WHERE PLANT_CODE = ' " & pt_code & " ' "
DoCmd.RunSQL StrSQL
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And if we are using multiple delete queries should we have the DoCmd.RunSQL <variable> after every delete statement or is it after all the statements


Thanks