The expense incurred by the director in eradicating camelthorn shall be borne as follows:
(a) One-third by the state, to be paid out of any sum appropriated for such purpose.
(b) One-third by the county in which the land is located on which such camelthorn exists.
(c) One-third by the owner of the land.
(Amended by Stats. 1977, Ch. 118.)