The order shall be terminated if the director finds that 51 percent by numbers and 51 percent by volume of production of the affected producers favor or assent such dissolution. The director may ascertain without compliance with RCW 15.65.050 through 15.65.130 of the act whether such termination is so assented to or favored whenever 20 percent by numbers or 20 percent by volume of production of the affected producers file written application with the director for such termination. The termination shall not, however, become effective until the expiration of the marketing season.