Category Archives: C-Rated

“C”
A pest of known economic or environmental detriment and, if present in California, it is usually widespread. C-rated organisms are eligible to enter the state as long as the commodities with which they are associated conform to pest cleanliness standards when found in nursery stock shipments. If found in the state, they are subject to regulations designed to retard spread or to suppress at the discretion of the individual county agricultural commissioner. There is no state enforced action other than providing for pest cleanliness.

Candidatus Phytoplasma trifolii Hiruki & Wang 2004 clover proliferation phytoplasma

California Pest Rating Proposal for

Candidatus Phytoplasma trifolii Hiruki & Wang 2004 clover proliferation phytoplasma

Current Pest Rating: None
Proposed Pest Rating: C


Comment Period: 02/19/2026 through 04/05/2026


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Posted by SK

Fusarium asiaticum O’Donnell, Aoki, Kistler & Geiser 2004

California Pest Rating Proposal for

Fusarium asiaticum O’Donnell, Aoki, Kistler & Geiser 2004
Current Pest Rating: Q
Proposed Pest Rating: C


Comment Period: 02/06/2026 – 03/23/2026


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Posted by SK

Gymnotelium blasdaleanum (Dietel & Holway) Arthur 1934 Pacific Coast pear rust

California Pest Rating Profile for

Gymnotelium blasdaleanum (Dietel & Holway) Arthur 1934
Pacific Coast pear rust
Pest Rating: C


Comment Period: 10/17/2025 – 12/01/2025


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Posted by SK

Cyperus esculentus, yellow nutsedge

California Pest Rating Proposal for

Cyperus esculentus, yellow nutsedge
Current Pest Rating: Q, W
Seed Rating: Restricted
Proposed Pest Rating: C


Comment Period: 09/26/2025 through 11/10/2025


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Posted by SK

Cyperus rotundus, purple nutsedge

California Pest Rating Proposal for

Cyperus rotundus, purple nutsedge
Current Pest Rating: Q
Seed Rating: Restricted
Proposed Pest Rating: C


Comment Period: 09/26/2025 through 11/10/2025


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Posted by SK

Globisporangium mastophorum (Drechsler) Uzuhashi, Tojo & Kakish., 2010 Root rot of celery and parsley

California Pest Rating Profile for

Globisporangium mastophorum (Drechsler) Uzuhashi, Tojo & Kakish., 2010
Root rot of celery and parsley
Pest Rating: C


Comment Period: 09/22/2025 – 11/06/2025


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Posted by SK