DPR 26-006 – 1,3-Dichloropropene Field Fumigation Method – Tree-Hole Method

The Department of Pesticide Regulation (DPR) proposes to amend Title 3, California Code of Regulations (3 CCR) sections 6448, 6448.2, 6624, and 6626. DPR also proposes to amend existing document “1,3-Dichloropropene Field Fumigation Requirements, Rev. January 1, 2026” incorporated by reference in sections 6448, 6448.2, 6624, and 6626. The pesticide regulatory program activities affected by the proposal are those pertaining to restricted materials and pesticide use enforcement. In summary, the proposed action allows for the use of 1,3-dichloropropene (1,3-D) to fumigate individual tree-holes (also known as tree planting sites), making permanent the three-year interim approval of the method granted in September 2024. The proposed action also establishes additional restrictions on use of the tree-hole method, including more stringent limits on the number of tree-holes per acre.

• 10/30/2026 - 12/14/2026

Attachments

• Notice of Proposed Regulatory Action - English pdf  
• Aviso de Acción Reglamentaria Propuesta - Spanish pdf  
• Text of Proposed Regulations - English pdf  
• 1,3 Dichloropropene Field Fumigation Requirements Revised September 1, 2027 - English pdf  
• Initial Statement of Reasons - English pdf  
• Declaración Inicial de Razones e Informe Público - Spanish pdf  
• Economic and Fiscal Impact Statement (Form 399) - English pdf