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Citrus Canker Quarantine

Citrus Canker.
Impact
. Citrus canker normally causes leaf-spotting and fruit rind-blemishing, although when conditions are highly favorable for infection, citrus canker can cause defoliation, shoot dieback, and fruit drop. Marketability of symptomatic fresh fruit is negatively impacted. Citrus canker is harmless to humans and other animals.
Biology of citrus canker. Citrus canker bacteria are spread by wind, splashing water, movement of infected plant material, or mechanical contamination. The pathogen flourishes under moist and warm conditions. Citrus canker bacteria require a susceptible hostplant to grow in nature, although it can persist in cracks in bark for years. The bacteria can enter the tissues of susceptible citrus varieties through leaf pores (stomata) and through wounds such as those caused by leaf miners. Distribution of the disease in an infected plant is restricted to the localized sites of infection, since the bacteria can not spread systemically through the tree. Seven to 10 days following entry of the bacteria into a host leaf, a pinpoint lesion becomes visible. Young lesions on leaves are raised or ‘pustular’ on both leaf surfaces, but particularly on the lower surface. Leaf pustules characteristically develop a yellow halo with water-soaked margins, becoming corky and crateriform, with a raised margin and sunken center. Leaf lesions eventually can attain 2-10 mm diameter. Leaves and young green stems are vulnerable to infection. Lesions persist but new lesions are not initiated on brown hardened stems.

Richmond, Fort Bend and Harris Counties.
Citrus nursery trees at a retail nursery in Richmond, Fort Bend County, Texas, were routinely inspected by TDA on July 28, 2016. Some of the trees were found to be symptomatic for citrus canker; whereupon, TDA collected samples, placed the trees under seizure, and rushed the samples to USDA for identification. USDA immediately screened then sent the samples off for laboratory confirmation, which confirmed the trees were infected with citrus canker. TDA inspection determined that most of the approximately 300 citrus nursery trees at the retail nursery were infected with citrus canker. With the nursery’s consent, TDA destroyed all the symptomatic and the suspect citrus nursery trees and disposed of them according to sanitation procedures, to prevent accidental spread of the disease. USDA began survey work to identify all infected plants in the area and to determine how far the infestation extended in all directions. On August 10, 2016 TDA established the Richmond Citrus Canker Quarantined Area, in collaboration with USDA-APHIS-PPQ. Inspection of plants, their labels and nursery purchase records, disclosed that the nursery’s multiple varieties of infected citrus trees were from four propagative nurseries in Texas. All nurseries that had sold citrus plants to the retail nursery were thoroughly inspected and found to be free of citrus canker. The citrus nursery plants must have become infected after they had arrived at the retail nursery in Richmond. Currently there are no commercial producers of citrus fruit and no producers or retailers of citrus nursery trees inside the quarantined area. Only dooryard (ornamental/personal use) citrus trees are found inside the quarantined area. To combat the infestation, as soon as USDA locates a citrus canker infected tree, TDA inspectors seek homeowner cooperation, then destroy and sanitarily dispose of the tree. All varieties of citrus and other quarantined articles inside the quarantined area are subject to the quarantine restrictions and requirements.

Houston, Harris County.
Two adjacent sour orange trees in a city park in Houston, Harris County, Texas, were sampled on May 13, 2016, and confirmed by USDA to be infected by citrus canker. Both trees were destroyed and a delimiting survey of potential hosts has found no further infected plants. The department has quarantined the area that contained the infected plants. All varieties of citrus and other quarantined articles inside the quarantined area are subject to the quarantine restrictions and requirements.

Rancho Viejo, Cameron County.
Lime and lemon trees in the town of Rancho Viejo, northwest of Brownsville, Cameron County, TX, in Cameron County sampled on October 16, 2015, were confirmed by USDA to be infected with citrus canker. TDA has quarantined the infested area and is working in collaboration with the USDA, the Texas Citrus Pest and Disease Management Corporation (TCPDMC), Texas A&M University-Kingsville Citrus Center (TAMUKCC) industry and residents to destroy all infected plants and combat the spread of this destructive pest. Only kaffir lime, key lime and one Ponderosa lemon tree (with heavy leaf miner damage to the infected leaves) in the Rancho Viejo area have been confirmed by USDA for citrus canker. The field observations and research indicate that the strain of citrus canker found in the Rancho Viejo Citrus Canker Quarantined Area only infects lime and lemon trees. The pathogen is likely the Wellington or W strain. All varieties of citrus and other quarantined articles inside the quarantined area are subject to the quarantine restrictions and requirements.

CITRUS CANKER QUARANTINE

With the goal of containing and managing the infestation, the department has filed emergency quarantine regulations in the Texas Register, to cover the quarantined area declared on this webpage.

Under provisions in the Texas Administrative Code, Title 4, Chapter 19, Emergency Rule §19.401 (having to do with quarantined areas), the department has designated this page for declarations and descriptions concerning areas in Texas that are quarantined for citrus canker. Names and descriptions of quarantined areas are effective and enforceable upon being published online in the “Current Quarantined Areas” section of this page. 


QUARANTINE REGULATIONS

   CLICK HERE
to view TDA's Citrus Canker Emergency Quarantine regulations, as published in the Texas Register. 

CURRENT QUARANTINED AREAS

Per Emergency Rule §19.401, the following quarantined areas are subject to the quarantine:

Interactive Overview Map. To determine whether you are inside a quarantined area:
(1) Go to the map and click on the Magnifying Glass icon (in top of map's Legend).
(2) Enter your address in the blank line; click on the search results.
(2) Use the +/- control (bottom left of map) to zoom in/out, to see where you are relative to quarantined areas (shaded red).

CLICK HERE to view Interactive Overview Map of quarantined areas.


Houston Citrus Canker Quarantined Area:

   CLICK HERE to view Map of Houston Citrus Canker Quarantined Area.
   CLICK HERE to view Legal Description of the Houston Citrus Canker Quarantined Area.

Rancho Viejo Citrus Canker Quarantined Area:


   CLICK HERE to view Map of Rancho Viejo Citrus Canker Quarantined Area.
   CLICK HERE to view Legal Description of the Rancho Viejo Citrus Canker Quarantined Area.

Richmond Citrus Canker Quarantined Area:

   CLICK HERE to view Map of Richmond Citrus Canker Quarantined Area.
   CLICK HERE to view Legal Description of the Richmond Citrus Canker Quarantined Area.




CHRONOLOGY

08/01/2017. The Richmond Citrus Canker Quarantined Area, previously (01/27/2017) modified,  is hereby modified. This quarantined area includes areas in Fort Bend and Harris counties.

01/27/2017. The Richmond Citrus Canker Quarantined Area, previously (11/24/2016) modified,  is hereby modified. This quarantined area includes areas in Fort Bend and Harris counties.

11/28/2016. TDA filed an updated Citrus Canker Emergency Quarantine (Title 4, Chapter 19, Subchapter U, §§19.400-19.409) with the Texas Register; the quarantine became effective upon filing.

11/24/2016. The Richmond Citrus Canker Quarantined Area, previously (11/16/2016) modified,  is hereby modified. This quarantined area includes areas in Fort Bend and Harris counties.

11/16/2016. The Richmond Citrus Canker Quarantined Area, previously (11/10/2016) modified,  is hereby modified. This quarantined area includes areas in Richmond, Fort Bend County.

11/10/2016. The Richmond Citrus Canker Quarantined Area, previously (11/01/2016) modified,  is hereby modified. This quarantined area includes areas in Richmond, Fort Bend County.

11/01/2016. The Richmond Citrus Canker Quarantined Area, previously (09/29/2016) modified,  is hereby modified. This quarantined area includes areas in Richmond, Fort Bend County.

09/29/2016. The Rancho Viejo Citrus Canker Quarantined Area, previously (03/10/2016) modified, is hereby modified. This quarantined area includes areas northwest of Brownsville in Cameron County.

09/29/2016. The Richmond Citrus Canker Quarantined Area, previously (08/25/2016) modified,  is hereby modified. This quarantined area includes areas in Richmond, Fort Bend County.

08/25/2016. The Richmond Citrus Canker Quarantined Area, previously (08/10/2016) added, is hereby modified. This quarantined area includes areas in Richmond, Fort Bend County.

08/10/2016. The Richmond Citrus Canker Quarantined Area (see above), in Richmond, Fort Bend County is hereby added to the quarantined areas in Emergency Rule §19.401.

06/30/2016. The Houston Citrus Canker Quarantined Area (see above), northwest of Brownsville in Cameron County, is hereby added to the quarantined areas in Emergency Rule §19.401.

06/17/2016. The department filed a new Citrus Canker Emergency Quarantine (Title 4, Chapter 19, Subchapter U, §§19.400-19.408) with the Texas Register; the quarantine became effective upon filing.

03/10/2016. The Rancho Viejo Citrus Canker Quarantined Area, previously (02/12/2016) added, is hereby modified. This quarantined area includes areas northwest of Brownsville in Cameron County.
 
02/12/2016. The Rancho Viejo Citrus Canker Quarantined Area, previously (02/02/2016) added, is hereby modified. This quarantined area includes areas northwest of Brownsville in Cameron County.

02/02/2016. The Rancho Viejo Citrus Canker Quarantined Area (see above), northwest of Brownsville in Cameron County, is hereby added to the quarantined areas in Emergency Rule §19.401.

02/01/2016. The department filed a Citrus Canker Emergency Quarantine (Title 4, Chapter 19, Subchapter U, §§19.400-19.408) with the Texas Register; the quarantine became effective upon filing.