Inedible kernel means a kernel, piece, or particle of almond kernel with any defect scored as serious damage, or damage due to mold, gum, shrivel, or brown spot, as defined in the United States Standards for Shelled Almonds, or which has embedded dirt not easily removed by washing. This definition may be modified by the Board with the approval of the Secretary: Provided, That the Board shall submit any recommendation for modification to the Secretary not later than August 1.