Section 20 of the Principal Act is repealed and the following section is substituted:

20.     Changes to weed management plan

(1)  The Minister, by order published in the Gazette , may change a weed management plan by omitting, amending, substituting or adding any provision if satisfied that an emergency has arisen, or is likely to arise, making it necessary or advisable to so change the weed management plan.

(2)  The Secretary may amend a weed management plan by –

(a) correcting a minor error in the plan; or

(b) making a change of form, not involving a change of substance, in the plan.