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.

CITRUS CANKER QUARANTINE

   CLICK HERE to view the Citrus Canker Quarantine regulations (Title 4, Chapter 19, Subchapter U, §19.401).
 

Under provisions in the Texas Administrative Code, Title 4, Chapter 19, §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 on this page

 

Greater Houston Quarantined Areas

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

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

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

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

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

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

Rio Grande Valley Quarantined Areas

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

San Benito Citrus Canker Quarantined Area:
  CLICK HERE to view Map of the San Benito Citrus Canker Quarantined Area.
  CLICK HERE to view Legal Description of the San Benito Citrus Canker Quarantined Area.

Los Fresnos Citrus Canker Quarantined Area:
  CLICK HERE to view Map of the Los Fresnos Citrus Canker Quarantined Area.
  CLICK HERE to view Legal Description of the Los Fresnos Citrus Canker Quarantined Area.

Bayveiw Citrus Canker Quarantined Area:
  CLICK HERE to view Map of the Bayview Citrus Canker Quarantined Area.
  CLICK HERE to view Legal Description of the Bayview Citrus Canker Quarantined Area.

San Jose Citrus Canker Quarantined Area:
  CLICK HERE to view Map of the San Jose Citrus Canker Quarantined Area.
  CLICK HERE to view Legal Description of the San Jose Citrus Canker Quarantined Area.

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

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