Tkinter: Treeview with repeated values after pressing "query" button

Question

Every time I press the "Query" button treeview updates, but also by adding previous Rows.

    def consultar(): 
    #função que Mostra na treeview todos os produtos cadastrados
                    conn = sqlite3.connect('banco_produtos_cadastrados.db')
                    bd = conn.cursor()
                    bd.execute("SELECT * FROM produtos")
                    rows = bd.fetchall()
                    for row in rows:
                        print(row) # Mostra toda tabela
                        tree.insert("", tk.END, values=row)

tree= ttk.Treeview(janela2, column=( "column1", "column2", "column3", "column4", "column5","column6"), show='headings')
ttk.Style().configure(tree, background = "black", foreground="white", fieldbackground="red")

tree.heading("#1", text="código")
tree.heading("#2", text="Produto")
tree.heading("#3", text="Marca")
tree.heading("#4", text="Fornecedor")
tree.heading("#5", text="Preço")
tree.heading("#6", text="Preço do fornecedor")    
tree.pack()