(a) All rootstock seed planted for propagation must have undergone a thermal treatment or other treatment approved by the department to reduce the risk of citrus infesting pathogens, including Phytophthora.(b) All planting, growing and budding of rootstock or other propagative material, including seeds, shall be in a certified insect exclusionary facility.(c) Rootstock produced any way other than from seed:(1) shall have been taken from a tree tested within the previous year, using methods approved by the department, and found free of diseases quarantined under §21.2 of this chapter (relating to Quarantined Pests and Diseases); and(2) the source tree shall have been maintained continuously in a facility with current certification.(d) Documentation of negative results of tests described in this section shall be maintained for at least four years following distribution of all plants propagated from the source tree and shall be available for inspection during normal hours of operation.