TreeCheckIndependent · unofficial

Is Lassen County in the citrus quarantine?

Outside

No — no part of Lassen County is inside the citrus quarantine.

Outside the quarantine

Bieber, Clear Creek, Doyle, Herlong, Janesville, Johnstonville, Litchfield, Little Valley, Madeline, Milford, Nubieber, Patton Village, Spaulding, Stones Landing, Susanville, Westwood.

What the quarantine rules generally say

Not an official determination

  • The quarantine covers citrus plants and their relatives (for example lemon, lime, orange, kumquat, curry leaf and orange jasmine): the plants, cuttings, leaves, stems, budwood and seed for planting. (3 CCR 3439 (C.1))
  • Citrus fruit with no leaves or stems attached is not one of the covered items. (3 CCR 3439 (C.1))
  • Covered plants and plant parts may not be moved out of the quarantine area unless they meet federal requirements. (3 CCR 3439 (D.1))
  • Inside the quarantine area they may only be moved if they were grown in an approved insect-proof structure under a compliance agreement, or certified. In practice: don't share, trade or move citrus plants, cuttings or leaves. (3 CCR 3439 (D.2))
  • Citrus green waste and equipment used on citrus must be cleaned or treated before moving; processed green waste may go directly to a landfill or licensed compost facility inside the area. (3 CCR 3439 (C.3, C.4, D.6))
  • Nursery plants allowed to move within the area carry a label saying they may not leave the quarantine area. (3 CCR 3439 (D.4))
  • A new quarantine area is at least a 5-mile radius around a tree that tested positive, so the line moves when new trees are found. (3 CCR 3439 (B.1.b, B.3))

Confirm with CDFA: 1-800-491-1899.

Tree looks sick? Who to call in Lassen County

What to do if your tree looks sick →

Source: CDFA county commissioner contact list (checked October 9, 2026).

Other counties: Orange, Los Angeles, Riverside, San Diego, Ventura, San Bernardino, Imperial