California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 74952.5

(a) Unless exempted by this chapter, the commission shall levy the assessment on the producer if he or she does any of the following:

(b) If a producer delivers winegrapes to a vintner or handler for processing without selling them to the vintner or handler, the “weighted average producer returns per ton” by district as published in the most recent Final Grape Crush Report issued annually for the current marketing season by the department shall be used as the basis for determining the gross dollar value of the winegrapes for the purpose of determining the amount of the assessment.