Huanglongbing (HLB)
Regulation and Quarantine Boundaries
Pest Hotline: 1-800-491-1899 The plant disease known as Huanglongbing (HLB) is believed to be caused by a phloem-restricted bacterium which is vectored by the Asian Citrus Psyllid (ACP).
Quarantine Information
Quarantine Map Overview
Options available for viewing the quarantine boundary maps:
- State Overview : For reference Only
- State Overview Map with Grids and Links : Map containing grid numbers linking to specific areas in California.
- Active Quarantines Web Application (11/30/2023)
- HLB Overall Quarantine Boundary Layer (11/30/2023)
- Boundary Maps: Maps section below. Click on a grid number to open map to specific area in California.
| Grid #420 | Grid #421 | Grid #436 | Grid #437 | Grid #439 | Grid #440 |
| Grid #441 | Grid #455 | Grid #456 | Grid #457 | Grid #458 | Grid #459 |
| Grid #469 | Grid #470 | Grid #471 | Grid #472 | Grid #482 | Grid #483 |
| Grid #499 | Grid New #500 |
Grid #510 | Grid New #511 |
Grid #522 |
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ACP/HLB
Resources
Interactive Website for Asian Citrus Psyllid Management (for Growers and Homeowners)UCANR
Asian Citrus Psyllid: Provisional Treatment Guidelines for Citrus in Quarantine Areas UC IPM Online
CA Citrus Pest and Disease Prevention Committee (CPDPC)
County Agriculture Departments
Invasive Pests and Diseases
HLB Online Resources USDA
PEST FACT SHEETS:
CDFA Entomology Lab Plant Pest Information USDA/APHIS Save Our Citrus USDA
CDFA Entomology Lab Plant Pest Information USDA/APHIS Save Our Citrus USDA