(a) Concise statement required. The statement of issues by the Administrator shall set a time in which any person wishing to participate in the hearing shall file a written response to the statement of issues as provided by § 164.24. The statement of issues shall include questions as to which evidence shall be taken at the hearing. Those questions may include questions concerning whether a pesticide's registration should be canceled or its classification changed, whether its composition is such as to warrant the claims for it, whether its labeling and other material submitted comply with the requirements of the Act, whether it will perform its intended function without unreasonable adverse effects on the environment, and whether, when used in accordance with widespread and commonly recognized practice, it will or will not generally cause unreasonable adverse effects on the environment.

(b) Amendment to statement of issues. The statement of issues may be amended or enlarged by the Administrator at any time prior to the commencement of the public hearing. If the Administrative Law Judge determines that additional time is necessary to permit a party to prepare for matters raised by amendments or enlargements to the statement of issues, the commencement of the hearing shall be delayed for an appropriate period.