(a) Trees in a foundation block must be tested by a certified laboratory to verify that foundation block trees continue to be free of diseases listed in §21.2 of this title (relating to Quarantined Pests and Diseases).
(b) At a minimum, the following measures shall be taken to prevent disease contamination from internal or external sources.
  (1) If one or more foundation block trees become infected with a disease listed in §21.2 of this title, or a vector of such disease, the affected tree(s) must be removed immediately.
  (2) Tools and equipment used to cut or prune foundation block trees shall be used only in the foundation block and shall be disinfected before use on any other tree, unless:
    (A) it is impractical to restrict equipment use only to the foundation block; and
    (B) such equipment has been treated with an antimicrobial pesticide labeled to control citrus graft transmitted pathogens and/or as guidelines prescribed by the department.
  (3) Irrigation of the foundation block shall be performed in such a manner as to minimize the risk of transmission of diseases through the irrigation system.
  (4) A foundation block must be completely contained in a certified citrus nursery in accordance with Subchapter D of this chapter (relating to Citrus Nursery Stock Certification Program).

Source Note: The provisions of this §21.32 adopted to be effective December 31, 2015, 40 TexReg 9626